Okay, everyone, please comment quickly and tell me. Give it. You will love my audio and video. Are you able to understand clearly? quickly Tell me from My brother, it just happened that the class I had to pick it up yesterday evening. But a little bit I got late in making the PPT. I I apologize for that because many times What if I have such a thing for you? I had to make a PPT so that in a single PPT I will give you more and more content. I can Children, in today's class this is what you All these topics have been written, right? I am going to revise all the topics of Am. This is just a formula revision class. It is not happening my brother. I will tell you first In this I will revise you every single thing. I will get it done. That means any important concept also If it happens, I will bring revision for that also. If there is a formula then revision of the formula also I will do it. So, I revised everything. There will be class. So all of you quickly Please share the session. I have this class at 4:00 I am taking it live at 10 pm. Isn't it? I had to take 8:00 am. You will say kill sir at 4:00 Why are you taking it? children so at 4:00 I'm taking it because if I'm at 8:00 If I had taken it, I would have taken it till 11:00 at the most. I could take the class. But now what am I I'm going to do that with a class at 4:00. By about 10:00 p.m., I Complete basic science by taking your class I will cover it. Just a quick one for you guys Please let me know by commenting once. to you my Is the audio and video clear? Hello Hello Rajvanshi Anukrosh Awesome right now when you If you see the PPT, you will understand as soon as it opens. That I will revise each and every thing for you next time. I will get it done in an hour and that too at least You can say less than this in the slides and one more thing Let me tell you guys I am going to give the exam. I'm telling you, you never read from me today. You haven't read it yet, you read it from some other channel. You are coming and completing this class. keep looking, I claim that my You have to complete the entire paper from the class today. Full questions in the July 28 paper Will see you. Ok? Let's be clear Is? Yes 10 p.m. The class is still going on till now. That is absolutely correct. By commenting Tell me. Yes, there is one more thing. I am very much I will not take comments. Just look at it, it starts I am taking comments. very good very Good. Jai Bheem. very good. Poonam Kumari Very Good Ramesh. So in the meantime I will keep your comment in the same I will take the time to ask you this, brother. Tell me whether you understood it or not. Are? So when you understand, you will tell him I will take your comment later when somehow Are you having any doubt? So one quick time Tootie Class which is a surprise class It is starting the way it is. So this is me I want you all to quickly Share the session and those who have just I haven't liked it yet, please like it once. History in a history-making class I am saying this because today's class One who has studied the whole thing can never learn basic science. It doesn't matter if you read it or not. It is not there at all. finish today's class After this you will get complete basic science cover. Will be done. ok sir i have completed my entire class Done it. I have done a lot of revision also. Very Good, very good. Sir my dr dbt class I will start after this. one of mine I have a small request. Just a small one. Now! There are 450 children watching us. You quickly Please share the session once so that it Number at least me on the screen 500 plus Let it be visible. 500 plus will be visible as soon as I'm going to start with my first one and finish it all. I will start the whole thing. Once Quickly, everyone, first of all, a quick session Please share it further. I just understood something I did not come. very good. don't you worry Yes. I understood everything. PDF also Will give. Absolutely. You can also download its PDF Will get it. What will happen with the PDF? Your revision will be easier. Ok? Let's get started. one quick time Please tell me by commenting. Let's start. Baby, a lot of people are saying it, recorded There is a class. My brother I am taking live. If it was a recorded class, my previous one You should go and see the 12-hour class. It has approximately 3 lakh 3.5 lakh views. Is. I would record that and upload it. Isn't it? Yes, where can I get its PDF? I will tell you about the PDF. PDF You will find it on my Telegram channel Whose name is Pathashala Railway Exam. You Take a look at Pathashala Railway Exam. I am among I will also show you this Telegram channel. On this you people will get the complete information of this class. You will get the complete PDF. Ok? So Start a complete revision class. First of all, by doing that sir, people comment in good language. I can't read much now because I'm so The comment is moving up quickly, okay, let's go. Then the class should be started once again. Please comment quickly and tell me, I am very scared. I am feeling very scared, I am a I will tell you something small, just take two minutes. Just come because it's a long class until There will be no energy from within, there will be no fun. I will say one small thing on 28th July. There is a lot of paper, I am feeling very scared from inside. what will happen, what will happen to us, how many You should get marks, target 80 plus. At least 45 out of 50 in Maths and Reasoning Bring it and from this class I will give you at least I guarantee 40 plus questions. You will get 40 plus questions from this class. You will go, just get 80 plus marks. The selection will be confirmed ok so there is nothing to be afraid of very dot Hello Hello Hello Hello Hello Let's So let's start the class with this All the chapters are basic electricity lever Kinematic which you can also know as speed and velocity You say. Word Power Energy, Unit Measurement, Mass, Density, Drawing Instrument, Projection, Types of Line, Heat and Temperature. I am of all these I am going to make you revise now. So let's go Then we start with the first chapter. Are. The name of this chapter is Basic Electricity. carefully in your paper Listen to this. You should ask at least three to four questions. Basic electricity will be visible. Three to four questions. Children, if we do basic Talking about the first heading of electricity what should our first heading be Take care of basic electricity What is meant by basic electricity? So the beginning of basic electricity What we have is electric current and charge. It happens from. Whenever someone asks you What is electric current I equal to? then say Give electric charge flow at unit time. Meaning passion And if you take the ratio of these two times So this is the electric current. on impulse Unit time is what we call electric current. They say. And keep in mind the unit of I The unit becomes Kalam per second. Children, this Kalam is a unit of charge. Is. The unit of time is second. On Kalam seconds and keep this in mind we full name What do you know from this? Ampere speaks. Second on Kalam. Remember this q q means charge and the charge which is It is due to the flow of electrons Comes. the flow of charged electrons It comes because of that. So q equals you guys Remember the formula n * e here n What is? So say that whatever n is, that is the number of electrons. This is our n. While e What is? So e is the electric charge The charge of the electron is 1.6 * 10 to the power of -19 Less. I will tell you one more thing to keep in mind I give. Sometimes in your exams A question will come directly. Direct question It will come that if we have a current flow of 8 amperes If this has to be done then how many electrons should be shed? So to flow a current of 8 amperes 6.25 * 10 to the power 18 electrons per second We have to flow. 6.25 * 10 to the power 18 electrons flowing past us per second Will have to. Only then will 8 ampere current flow Will happen. Ok? good kids electric current And in passion, keep in mind that both of them What are the zodiac signs like? scalar quantities were Is. When you talk about these two zodiac signs Whether it is current or charge, it is the What are both zodiac signs like? a scalar quantity It happens which you people also call stellar quantity. They say. After this, Kalam's rule Do remember the formula. Coulomb's law is states that if we have two point charges Is. Isn't it? What kind of charges should the two have? There must be point charges. Suppose a charge We call this q1 and the other charge We call this q2 and the distance between them There is distance, we consider this distance ours Let's say r from the side. So both the charges The electric force acting between is one upon Four pi0 and further note q1 q2 divide By r square this is our electric force The formula is f equals one upon four pi Note q1 q2 divided by r squared children Keep in mind that this is Coulomb's law. table and only for which charge it appears Saying it will fight for static charge, that is How should our passion be? To be stable. Needed Ok? Secondly, our passion should be That point should be charged. How? Should it be charged? Point is charging. When Only when our charge point is charged will you Coulomb's law can be applied. and points How does our charge change as we get charged? Should it be? Must be stable. only then you Coulomb's law can be applied. remember the children Please keep this one upon four pie app not Is. You should also remember its full value. Needed Its full value is 9 * 10 to the power of 9 but when the unit of this whole If we see it being taken out, then it is Newton meter Square Per Kalam Square Aayega Per Kalam Square will come, one more thing and I will tell you I want to tell you that this is 0 and one more The term whose unit was asked last time comes It was what you call it – note these two The units of are asked many times in your exams. He also takes it directly, take care of the children. This 0 note is what we call it. Electricity. It is called electrification. And if you want it, It is called permittivity in English. Permittivity And this μ note is what we call it Magnetism. Both are of our vacuum. Vacuum It is of. One is called Electricity. speak to another Magnetism. Children, this 0 is In English we say permittivity and μ Note that this is called permeability. The units of both permeability are large. It is important. The unit of 0 is farad per You have to remember the meter kids and the μ note The unit is Henry per meter. Have to remember. This is the farad per meter and it Henry per meter. children to you people I would like to point out one more thing that There is a Faraday. There is a Farad. The scientist has a name but the one who is Farad If it is the unit of our charge then Keep in mind that if someone asks you what is the value of a farad How much art is there, so even a fared The unit of our charge is attention in it Keep 96500 If there is Kalam then Kalam is also a symbol of passion. The unit is farad. It is also a charge unit and a There are 96500 Kalams in a Farad. this also This is important data. Now there are a lot of Questions will come like q1 q2 change kar de rha I am asking the value of the force. similar The questions will be ours in this. children after Our three definitions are often He asks you in your exam. Electricity field electric potential children first electricity What do you understand by field and electric potential? Is? Whenever you ask about electric field, say Let the electric field E be equal to Force per unit charge. E will equal F / Q And E will mean force per unit charge. This is our electric field. E is equal to F / Q Force per unit charge. This is what we People call it electric field. unit If we look at it, the unit of electric field is The unit of force is Newton and the unit of Q is Coolum. Kalam on Newton, our electricity It is a unit of area. While electricity If we talk about potential, then electric potential or Tell me the potential difference. It means Unit charge on work. Kids Delta V is equal to work per unit charge w/q. take into account the electric potential or potential difference The unit of work will be joule And the unit of charge is joule per coulomb below. Children should pay attention to the unit of e. See. f/q is the formula and v is What is the formula? w/q wherever Always keep in mind that the area is written What kind of zodiac sign is that? It is a vector quantity. And wherever you find Vibhav written, keep that in mind. We have a scalar quantity. And both of them Numerical questions on formulas are asked a lot. Are. They are very numerical. v = w / q They come in abundance on me. one on both of these There is also a relationship. There is a relation between the two It happens. Take care. Isn't it? baby i Let me tell you. So I will give you the first PPT Let me show you. Error Hodia, Types of Error I made Hodiya, Sarthak and all the PPTs. It is kept. Don't worry. Now you just look Stay. Ok? The relationship between these two e is equal to minus deltaV/ Deltax. Children, this Delta V/Delta x is called potential gradient. take care of this Which is all deltaV by deltaX We call this potential Gradient or also called potential gradient So the potential gradient is also The electric field e is equal to deltaV / x Now here's a special thing kids, this which is the formula for electric potential w / q Which makes the amount of joules per liter less this whole Sometimes we also call joule per volt. Do you write? I would also write volts and if here You wrote volts and below that delta x If x means meter then the electric field Another unit will also become yours. Volts per meter. so electric field Our two quantities are Newton per volt meter and also two quantities of electric potential joule Prati Kalam or what should we call it? Can you sir? We also call this volt. May go. Explain to the children the electric field and electricity. The next definition that comes after potential is Electrical capacitance. electrical capacitance which is called Are. This is what electric capacitance means For example, suppose we have a is a conductor. This is the conductor. Isn't it? Any I made the driver plate. When this driver You will charge the plate. When this driver plate If you give charge to something, then this charge will accumulate within you. He will do it. Tell me what this passion does to you. Will you take it? He will collect it. then the electric capacitance What does it mean sir? Sir electrical capacitance It means the ability to hold a charge and the electrical capacitance C is equal to q / v The capacity to hold a charge is We call this capacitance and C The equivalent electrical capacitance C is equal to q But remember, this q is coulomb v Meaning, if volt is then the electrical capacitance is C The unit will be above coulomb below volt coulomb This is our electrical capacitance per volt. Unit C equals right? C equals Q B Is. The ability to hold a charge is called electrical It is called capacity. unit of electrical capacitance Kalam became per volt. And this entire Kalam We also know per volt by another name. It is known. Tell us what we are Do you speak? Faraday. What do you say? Faraday. This is our Farad. Isn't it? Take the Faraday tool here. Pardon me. Here But Faraday should be postponed. Faraday Talley. Faraday 8 Faraday. Putting Faraday here. So The unit of electrical capacitance is coulomb per is volt and we can write this as per volt. What people say is Fard. So these three of them The formulas should be very clear to you people. Should go. Tell me, it's clear to everyone here. Went? Let's move ahead. Well then we The next heading of the people will come. some us There are more formulas for capacitance to understand. Such as You understand the capacity of the bullet driver. There is a bullet and this bullet I gave in to the passion. So tell me how much passion Can it be stored inside itself? So any The bullet will be the driver, that is, it is the conductor, but is a spherical conductor then The capacitance of C is equal to the formula 4 pi 0 * R children 4 0 * R this is your pill is the capacitance of the conductor and let me tell you From here, when you see the unit of the note So the unit of C above is the unit of radius below. And the unit of C is farad and radius The unit is meter. That's why another note I had mentioned the quantity as farad per meter. it This is where it came from. farad per meter from here Came. Ok? We call the capacitance of a spherical conductor People can say capacitance in English. of spherical conductors. Capacitance of Spherical conductor. You can say this to is the capacitance of the bullet conductor. Isn't it? charged Energy of a conductor. Energy of a charged conductor. So children, three types of energy of a charged conductor Formulas have to be memorized. u equals first You all must be knowing Formula 1/2 Cv2. U = 1/2 CV2 and I have set C equal to I just told you the formula Q/V. As soon as you put C = Q / V here then U Your second formula becomes 1/2 and 8 V V to V see C equals Q / V so 8 V to V will cancel out. So Q*V this next The formula was formed. And if you put v equals back here q/c then one third of its energy is lost when q/c is kept The formula will become energy of a charged conductor of q squared will be our top and c Our bottom So if you charge any conductor Yes, charging it means you give it energy. Does charging mean you give it energy? So while giving charge, the energy that comes to it The formula of that energy is you How can you write this in English? You can write this heading in English. Energy of charged conductor. Whatever our energy of a charged conductor I have found a formula for the energy that is being generated. Wrote it here. Parallel plate capacitor. parallel plate capacitors that you call parallel Parallel plate capacitor. parallel plate The meaning of capacitor is that whenever two plates parallel to each other If the charge is given then +q In one, charge comes and in the other, -q charge comes. So This parallel plate capacitor is made of The capacitance of a parallel plate capacitor is C equal to that formula A 0/ D So C = A 0/ D is a parallel plate The formula for the capacitance of a capacitor is. C = A 0/ D is very important. know from here It follows that the capacitance of the capacitor is is proportional to the area and the middle It is inversely proportional to the distance. Isn't it? area proportional to the distance between Inversely proportional. What is this A over here? So let's say this is the area of ​​our plates. And what is d? It's what's between our plates. There is distance. D What is ours? of plates The distance in between. Ok? Tell me quickly. Even talking to everyone Is it clearing? one quick comment Do it and tell me. Totally what should we do? Is? Completed in the next 6 hours Revising the entire BSCT Is. That is why you people should do it for revision purposes. So I'm telling you all the things that It is important for your exam purpose. Ok? Is it clear? Let's move ahead. So this C is for some doll. Only For Dolet, this is for parallel plates. And these became our formulas for energy. And This formula that I told you is This is the general formula. You can put it everywhere yes. Now comes the most important headline that Series capacitor and parallel capacitor What is parallel? For example, suppose that We have three capacitors and three If the capacitor is placed on the same path This is called our series connection. same It should be placed on the road. children whenever He was told that he would be put on the same path. Series combination will go. So the series What is happening in the combination, my brother? in The charge that will go to all will be Q I will have beans. But their voltage will be V1, V2, V3 will be different for us. So Series Combination Whenever you capacitor If you watch the series then keep these things in mind How will it be among the three? Charge Our Beans will be. Whereas what will our voltage be? So Our voltage will be different. in all It will be different. Ok? The series connection of coated capacitors Keep in mind that it is the reverse formula It is used. i.e. 1 / whenever C If you calculate net, you will need to use the formula will have to do 1 / C1 + 1 / C2 + 1 / C3 But if it comes down to two, just two. So for two, direct you formula You can use C1 C2 / C1 + C2 Please take care. So in series combination we People will use the reverse formula In capacitors. Direct in Resistance It connects. Whereas if this parallel plate If there was a capacitor, children would have used a parallel plate. Keep these three things in mind in capacitors All three capacitors are not in the same path They are placed in different paths. These See when all three capacitors are connected separately If they are placed on the road then they are told It is called parallel plate capacitor. Capacitance of a parallel plate capacitor I have assumed C1, C2, C3 from back. Who Your passion will also come from here. The charge will be distributed separately. So here Q3 is Will go. This will be Q2. Here's our Q1 Will be done. So the charge in parallel is different. But the voltage of these three will be What will our voltage be like for all three? Beans. So what do you all need to pay attention to in parallel? that whenever the parallel direction comes The voltage will be the same across all capacitors I and the charge which is called my charge Brother, how will our charge be different? will be different will be different Okay kids, after this, I'll tell you. Whenever in a parallel plate capacitor are connected in parallel then Take care to calculate the net capacity There is a formula, add it directly Which you can call C1 C1 + C2 + C3. C1 + C2 + C3 can be said. This is our There will be a formula in this. Ok? Just commenting once quickly Tell me. Things are becoming clear till here. One Everyone please share the bar session. Capacitor Series, Capacitor Parallel Is it clear? Let us now go to that heading. come in which will give you a chance in your exams. The question is bound to come. So, pay attention to this See from here. Children, in Ohm's law you What to remember? Whenever Ohm's law If you come, keep this in mind in Ohm's law It has been said that for any driver who The voltage is proportional to the current It happens. For example, suppose we have this There is a wire and we have defined the resistance of this wire as R I have said it and the current that flows in it That is I and its voltage is V. So the voltage across any resistance What is the flow like? It is proportional. When this proportional sign is removed, a We will apply a constant and we will call this constant People will say R. So from here, let R equal Resistance R equals formula V/I So R = V/I, so you have to remember it. This The way I asked you the equivalent formula I will go equal to you, so see, I equal to you The formula will become V / R V / R So both these flowers have to be remembered. These Who is our formula for? Oms It is for law. What will V be proportional to? V The proportional will be I. When does Ohm's Law apply to children? It happens? What are the limits? So Ohm's law applies This is the condition for it to happen. Limitation which is called Can speak boundaries. So Ohm's law There are only two conditions for it to be applicable. First The condition is that Ohm's law will apply only if When our temperature is what? Be constant. First condition. And the second condition is Ohm's law The application of Ohm's Law is always tristly come into force. A driver trill applies Is. That is, if you have a conductor. Ohm's law applies even if the material is a conductor remained. What is called conducting material? Driver material like our aluminum, As if our copper was done, as if our It became silver. For all this, Ohm's law It may seem so. But our driving material Ohm's law will not apply to them. Come on kids when these V are proportional V = R * I What did you say? Look what he said? Where V = R * I You. So if we do this in a graphical form Let us represent the voltage and call it Y. Assume in the axis. We call the current x If we assume that somewhere in the axis y equals mx and m which you can If you say slope it will become r. m slope What will happen? will become r. So my brother What are we going to do? The voltage here Let v be the y axis and the current be the x axis. Tell it in Axis. So see if its The draft should be made as it moves closer to the origin A line will be formed and the There will be a slope, that slope will become our resistance. Will go. So you also have to remember that if V and If the term is drawn between I then the term which The slope is especially that of the term VI which What does a slope tell us? It provides resistance. It provides resistance. Many questions are asked on this. I Look, I will make up a question or two from my mind. How will you be asked questions? Such as Suppose I made up Ohm's Law for you. And I told you in Ohm's Law that I have made a draft of V and I between. So between V and I I said that brother Look, I made three drafts here. one two And three more. I even gave the name. This is our There is a forest. This is our three. This is our two. So you tell me if these three drafts Let the resistance be R1, R3, R2 If so, tell me which draft resistance Will it be more? Which draft will be lower? This way Will be asked. So this is VI for the children and VI and what happens many times is that suppose here But we do I. Let's do V here. So I am going to tell you the general method. What is the general method? whenever anyone A graph is given and you are asked to Sir, tell me which is better among R1, R2 and R3 Is? So the first thing you will do is Finding the slope and what it means to find the slope All that happens is that the term with Y Put the term with x on top and the term with x on the bottom. Keep it. Slope means y / x. What does slope mean? If y / x is When done, the voltage in the y axis is In current v/i there is no resistance i.e. slope resistance is equal to Whose slope will be higher my friend Its resistance will be high, now the matter has come Whose slope is higher then the highest The slope of our R2 is, see, R2 If the highest and lowest slope is of R1 then R1 is the lowest and our R2 is the highest. R3 will be less than that and R1 will be This will be our best term. Now I am like this If we change the question a little bit here If I do I here, I do V here. So all of you should have asked this question now. How to apply it? Let's say the slope equals Y over X. Below Y would have i and X would have V down. I / Now V would not be i/V R, it would be 1/R. So The slope becomes 1/R. So the slope of which The more it resists, the less it resists. So that question too You can apply it very easily. So I I say that making a difference in the concept is very important. It is more important. Ok? Tell me, this is clear to everyone. Went. If you have any doubt, ask here first. Take it because now the important heading is He is more important than that Let's move ahead. Next Age IV What does the draft show? That's what I told you. The slope of IV draft is not R but 1 /R shows. Ok? Come on, come. Next children, next heading we Understand about resistivity. This is very It is important. When we talk about resistance If we talk about resistance, before I Let me explain one more term to you. Let's assume Do you have any resistance? These There is some resistance. Remember children whenever Ever talked about any resistance? It is known that resistance depends on Is? So remember my brother, the resistance is the length of that wire and the area of ​​that wire It depends. that is, proportional to the length Inversely proportional to the area. resistance area proportional to length It is inversely proportional. when the children If we remove the proportional sign here, then it becomes There is a resistance row which you You can also say constant. So R is equal to Roll/A R = RL/A What does this become of our resistance? Will you go sir? This is our resistance The formula will be formed. R = RL / A R = RL / A Children, if I ask you from here that Brother, tell me what will be the value of RO? So the value of row will be R * A/ L R * A/ L is the value of our resistivity row. Will go. Will it come or not? children this But I want to explain one more thing to you. Am. This term 'ro' that has been used is a Like, the cry came only after Constant. then cry The term came after Constant. That's why I this I say that our resistance is Neither resistance nor length Neither will it be a neighbor nor will it be a neighbor in this area. It will do because this is a constant term. in This is constant for all three. So What will the resistivity depend on? then say Give resistance to only two things It depends. Firstly, what is its temperature? Is? of the material and the other which depends Yes, it depends on the substance Resistivity depends on only two things One will do it on his temperature and the other on his on the substance or on anything else It will not depend on the children who Resistivity is ro is find its quantity Look at it and the ohm meter will come on. The ohm meter will come here which I have Resistance was created, resistance to this The unit of resistance will be volts per ampere. The quantities volts per ampere and the corresponding volts What can we say per ampere? Are? We call this volt per ampere as ohm. You can also say it. So the unit of resistance is It is Om. Hey, if the resistance is ohm then resistivity is It will be an ohm meter. Children, now you are mine I will tell you a very important thing. Am. When it is said to you that Sir, you It has been told on what resistance Is it dependent? So resistivity material and depends on the temperature She does. I told you two things. But Let me ask you what resistance depends on. Does it? So children, no resistance Resistance also depends on the length. Is. It also depends on the resistance area. Is. Our resistance is also at temperature It depends. Resistance is our substance It also depends on. Resistance to all of these Depends on things. resistance kiss Doesn't it depend on? So tell me my brother Resistance is the current flowing through the wire And the voltage coming in the wire depends on this Will not do. Why so? because remember When I told you V proportional I After proportionality I, we used constants Did it to R. Therefore, R is the non-flowing current. It does not depend on the voltage. you are someone Increase the voltage on the wire from 50 to 100 volts. If you give it, the current will increase. But the resistance of our wire is It will remain the same. Our resistance changes only when When you stretch the wire, that is, its length increases You give it. You break the wire resistance Will change. But breaking and pulling the wire Let's change the length and area. So resistance So it may change but the resistivity of the wire will never change. It does not change by pulling and breaking. Such as Let me tell you that I have this wire. Are? And this wire is made of iron. I broke this Gave. Now it will not break from me. So by breaking Its resistance will change. But its The material remains the same, so does the resistivity. Will not change. then pull the breaking hammer Resistance changes with hitting. anytime Resistivity does not change. this thing Everyone will take care. Ok? further discussion Listen. Children, you just gave me the term Told that our resistance is It also depends on the temperature. Isn't it? and resistivity also on temperature It depends. So you also know that It should be that its effect on temperature How is it? That effect I've been having for a while I am explaining it to you. Before that, you Understand two terms. Conductance and conductivity. Children, when we talk about conduct then Just look at the name. Resistance in this As the word is coming. conductance resistance Conductance resistance. so take care Conductance is shown by G. And Conductance is nothing. of resistance The opposite happens. Reciprocal speak This. They say reciprocal. So conductance It is reciprocal of resistance. inverse Is. is 1/r. Children's conductance is measured by g Let's do a show. And the unit of g will be 1 / Om. 1 Many times we reverse the Om and make it attractive. We write MAo or we call it Om They also write the inverse. Kids, another one of these There is also a name. So remember this, we What do people say, sir? This is what we people Also called Siemens. What do you say? Siemens. This is all our conduct. Attention Please keep it. Whereas when you talk about conductivity So just look at the name. It is clear from the name Conductivity. resistivity conductivity resistivity Remember my brother that our conductivity Sigma is your resistivity. It is reciprocal. of resistivity It is inverse. Isn't it? Resistivity It is inverse. and the conductivity of The unit will be 1/ohm meter. Let's show this with Sigma. conductivity It is sigma. The conductance is g. Correct? Now here comes a little confusion. Is. When you solve the question paper This confusion will remain there. It will remain 10001%. You will keep making mistakes. One thing kids Tell me what I would say about conductance is the reciprocal of resistance. I will say so I would say that it is inversely proportional. Tell me which of the two is correct. Is? resistance, which is Conductance is the product of resistance Is it reciprocal or inversely proportional? is the inverse of that is inversely proportional. Which of the two would I say is correct? So tell me you are not inversely proportional I will say Sir because when inversely proportional If you say this then it means this. And if you are saying the inverse, sir, then its This would mean this. So the inverse is correct, It is okay to endure reciprocal. Latin Latin It is wrong to say that the inverse proportionality is wrong. Ok? This option will be available, so I have already I have made it clear to you guys. Now children Let me tell you two more points here. I will tell you two more points. be careful Please listen. Let me tell you one more thing. Look, tell me this formula clearly. that the resistance is proportional to the length Is. But there is a very special test. That Keeping the special test sealed in a box All of you please write. Isn't it special for children? What is the case is that whenever you people Should the area ever be called the same? If the area is called same then keep in mind If the area is the same then the lower value is the same Resistance will always be proportional to length If the area is same then the resistance is always the length will be proportional to but if the length of a wire volume is the same volume is the same so volume If there is a bean, then always keep in mind the resistance The length is proportional to the square. these two This is a very important line. You will always be on this You made a mistake. What did I say? Area Same If it is there then the area is made same then resistance Proportional to length. Lena Volume Same Lyrics should be given. When does the volume become the same? When A wire is pulled and pressed Is. The volume remains the same at that time. So Resistance to volume being measured is proportional to length Square proportional. How did you ask? I will simply say, Sir, look at the volume. The product of area * length is equal to the sum of the squares. Is. And from here if the value of area If it is taken out then it will come to 1/l. 1/l Put the area value here. l² be above Will go. Ok? So these two things to you and It should be remembered well. Let's move forward We are the people. A little bit in this slide Tell me. In this slide, some brother If there is a problem, it is a problem for me. Please tell me by commenting. And those who haven't shared the session yet I hope that the energy I'm giving you a class today with the same You guys also support the class with energy. do. Will share the session. Just now I explained one thing to you, and that was this. that temperature affects resistance But on resistivity. So the effect is So tell me what effect does it have? this also Tell me sir. So keep that in mind whenever you talk Made of metal or alloy. Isn't it? Suppose there is some metal or alloy. Children, what do these people do sometimes? Name I will give it to you. What do you give? Name. As Everyone knows the name of the metal. Silver Is. Apart from this there is gold, copper, It is aluminum. Alloy. Alloy also alloy it occurs. In alloys such as our brass Gone, Brass. This is our alloy. Brass Done, nichrome is done. So what are these people? do that many times the name will say that the metal is an alloy and sometimes consists of metal alloys Instead of giving the metal, these people deliberately use silver. Will you take the name or will you take the name of gold? will we take it or will we take the name of copper or We will take the name of aluminium. For alloy These people can take the name Brass which you Do people call it brass or bronze? It can be what you people call Kasa. This way There are many more alloys. So remember Keep it for metal and alloy, you guys Whenever you increase the temperature, the temperature Keep in mind that their resistance is increasing Yes, it increases. Resistivity also increases She goes. But the conductivity decreases She goes. So be careful while increasing the temperature This increases resistance. Resistivity It increases. Conductivity decreases. Whose late For? For metals and alloys. children Let's talk about semiconductors. semiconductor which What do you guys say in English? It is called a semiconductor. Many times these people Semiconductors will be spoken and their names will be mentioned several times. Will take it. such as germanium It is a semiconductor. What is germanium Is? It is a semiconductor. silicone as a kind What happens to it? It is a semiconductor. So Directly these people speak in semi-drive We increased the temperature of the silicon. Tell What effect will it have on its resistance? So two very important ones are semiconductors You should know that, right? So For semiconductors my brother whenever you If people increase the temperature value then remember Keeping them reduces the resistance value. The resistivity value decreases And my brother, the conductivity value is The opposite happens. conductivity value Increases. This is the story I explained. I changed the story as the temperature increased. It has been explained by. according to the increase in temperature It has been explained by. according to the decrease in temperature If you are asked then brother, this is my Do it in reverse. Just do this much work. Its Nothing else. Like I said that The temperature of copper was reduced. Tell me What will be the effect on conductivity? As such The question came. So you know the booster Increasing that decreases the conductivity. Take I asked you for a subtraction. then subtract What will happen to it? It will increase. My point is you Are you understanding or not? He is telling everything Am. I am telling you the negative coefficient. I am telling you everything about positive coefficient. Worried Don't be. So kids, this is ours. Explanation when the formula comes as it is but What happens many times is that we need numerical It is also inserted into me. So remember The relationship of resistance with temperature tells you You should remember this. The resistance is at temperature T. RT = R0 + 1 in brackets * delta T My brother with the temperature of resistance Children, you have to remember the relationships also. here Alpha is called resistance temperature. Coefficient. What will Alpha be called? Alpha my brother calls it resistance heat Coefficient. Resistance temperature coefficient. This is our It's alpha. Please take care. While the point here Let's do delta tt so delta t means How much temperature have you raised, sir? Delta t means increase in temperature or temperature increment increment temperature Increase in Okay while R not what is sir? R spoke to not will reach 0 degrees centigrade Temperature at 0 degrees Celsius Resistance at 0°C Resistance this will be called ours and not man Let's say at 0 we know alpha we know delta t If you know, at any temperature 10 to 20 But you can tell the resistance, kids. The alpha in this is what you call resistance temperature The value of the alpha coefficient is called metal and Take care for alloy in plus Metals and alloys have alpha values is in plus for metal while Alpha Key for Semiconductors and Electrolytes What are the values ​​like? would have been negative Is. This should also be very clear to all of you. Should be known. Tell me quickly, all the children comment. Do it and tell me. So far you all are talking It became clear to the people. If there is any doubt Ask me now. Ok? Is it clear? very good. Everybody is one Let me know by commenting once. From Bhopal. Well, where have the centres been given? you upset Don't be. Watch this class completely. It will be completely finished. Come on, children. Its There are two more small headings after this. Their You can also see the formulas. speak to one are current density and what did you say to the other Does it go sir? The other is called Drift velocity. current density which you People say this in Hindi, you guys In Hindi we will say current density. Current This is called density. Current density. And what is drift velocity? Drift also, you Hindi also drift also Say. It is also called trailing velocity. In Hindi. Just remember this in Latin Hindi. Its Hindi is easy. drift velocity Isn't it drift velocity? First, I will give you Let me explain about both. Stream What is density? Simplex of current density This means that whenever the current If you are asked about density, you can simply say Give the current flow per unit area. current flow Per unit area this is our current density. J equals I up to I/A current density J Let's do the show from. and take into account the current density What kind of zodiac sign is it? Current density is our vector There is a sum. Current is a scalar quantity. But What kind of quantity is current density? is a vector quantity. Children, after this there is no need to talk about its unit. do. Then the unit of current density will be Ampere. The unit of area will be meter. Square. Ampere per meter square. Take care. Children, there is not one Relationships come up a lot. This is very important There is a formula. The formula is that the current J equals sigma * E. You remember this Please do it. This relation is asked a lot. Is. This is Relation Tinti Tinti Beach. then say Give me my brother this is the relation, Dhara then tent density, electrical conductivity and electricity The area is in between. J take equal care The formula becomes sigma * e Is. Kids, what is drift velocity? Is? First understand the meaning of drift velocity. For example, suppose I have put in front of you This wire was made in front of you. This is the wire And let me say that this is a metal wire. So if there is a metal wire then it will have free There will be electrons. And kids, this is free electrons are present when it has electricity The field is applied. Electricity Applying the field means one end It should be plus. minus the other end should be given. Isn't it? Consider it a minus, Consider it a plus. One end should be turned plus The other end should be made minus. Electricity Area applied. So electricity If you apply this area then it will be applicable to all All the electrons go towards the plus side Will take. Know their velocity It varies. But if all these If an average of the velocity is taken, then the same is called drift velocity. So if I reduce In other words, drift velocity is What? So tell me about the electron The average weight of the electron which is our average weight It is inside some wire that is ours is the drift velocity. The average of the electron Weight is our drift velocity, simple thing. Is. And remember the drift velocity we What do people do shows for? doing shows from vd Are. And what is its formula? These This is also a very important matter. Drift What is the formula for velocity? So The formula for drift velocity is given above. Current down n*e*a ye our drift The formula for velocity is Children, you should know all the terms here. What is the number of n? electrons are e what is electron electric charge 1.6 * 10 to the power -19 a about Everyone is getting to know about the area. I'm getting to know everyone, the current drifts Velocity vd is equal to i / n * e * a Now another story is created here. many of Children become happy. This is the i/a We can write it as j from here. So Become the next formula for Drift Velocity If the current goes then j / n * e this is also the formula It will be made. Many times we have passed through here. I ask regularly. So Section I asked the same If it goes then the drift velocity will be * N * E * A means use of all these formulas in new It is used in formula making. all of these Use of formulas to create new formulas We do. Isn't it? in your exams Questions are asked on very new formulas. Many new formulas will be asked. Like saying, look how many different kinds Formulas can be created. You know that R equals what you read or V equals what did you read? V had studied equally I * R I had read it or not. Now there are different types of See how the formulas will be made. V then Let it go. I then leave it. R instead of * Can write L/A. Can write. What We have written this rho as 1/sigma. Can do. In contrast to resistivity Comes. 1/sigma can. Sigma The value of can be picked up and stored from here. So whatever our camel-taming formulas All of them keep these formulas in mind. are made keeping in mind. and asks Please tell me what is the correct relation between them? Is? So then we have to form people here and You will have to put it there and tell the answer. Ok? So the talent density is clear to everyone. Went? Let's move on to the next one Towards the heading you call series traction or parallel traction test Resistance. Children, if we have many resistances Yes, and how do we connect those resistances? Gave? Added to the series. Meaning of series When the path is same then it is called series connection. Let's say. Suppose we have this R1 is the resistance. This is our R2 resistance. Is. This is our R3 resistance. In the series Are connected. So children, first of all I want to tell you I want to tell you that in the series everyone The voltage across the resistance is It varies. But everyone in the series The current in the resistance will be our Will be the same. The current will be the same. So the same thing I will write that again sir series connection What will our current situation be like? It will be beans. Whereas voltage V will be what we have? then say Let voltage V be our differential. In which? In the series. Children, everyone knows this. two things I And I will tell the children about your series Wires are connected to each other in the connection. So Getting it from area to area. Only then will we join. That's why be careful in series connection. We also consider the area to be the same. Latent In series connection, our length is not the same. Would have lived. Different strings will have different lengths. That means what will be our height? Different. So you should know about these four. Children, be careful in series connections whenever Sometimes you guys are asked about net resistance Neither does the series mean that you Add all the resistances together. it In which can we find our net resistance? Will you go? We will find out in the series. R1 + R2 + R3 Pick them all up and add them. Whereas if this parallel traction had been there then remember Parallel traction means that when all our strings are are connected in different ways. are connected in different ways. So They are told that this is how we There is a connection. This is our parallel traction. This is our parallel traction. Children, what is special about parallel traction? Is? What if there is a current coming in? will be? So in parallel direction if someone If the stream is coming then see, the stream will get divided. What will happen to our stream? It will be divided. It will be distributed. The voltage on all these will be ours. How are you? It's happening. The resistance is Let's assume they are different. There is no meaning in that Not only this, we have resistance. So parallel What is special about direction is that in it What will the voltage be like in everyone? Beans will be. What will Section I be like? Section I Different You guys tell me. and if the length and area Let's talk about length and area. Length, area, area, top, bottom are added like this If it is there then our area will become different. How will our area become? be different Will go. And if we talk about length then length How will it be for us? It will be beans. Right kids? So after this, if we vote for it Let us tell you its net resistance. What will happen? So what about parallel traction The net resistance will be opposite to It connects. i.e. 1 / r net equals formula This will become 1 / r1 + 1 / r2 + 1 / r3 Our parallel net resistance will be. It's not three times the size, it's just two, so for two Keep in mind that your net resistance will be R1 R2 / R1 + R2 This is our formula for two ok brother Now let me tell you a small point. Let me explain this is a small point. This is a special point, you should understand this. I am taking down a lot of notes here. This is an important point. listen carefully Children. Suppose I told you That I have a resistance of 10 ohms. My It has a resistance of 15 ohms. I have 20 Ohm's resistance. And these three we how to add? to be added in parallel. how to add? to be added in parallel. So I want to teach you two things. Listen carefully. Whenever many resistances are connected in parallel So their net resistance is Comes smaller than the smaller one. small ones Smaller than means smaller among these three 20 15 10 10, so whatever our net resistance is The answer that will come will be less than 10 ohms. it I am telling you this beforehand so that whenever If you ever see a question whose answer is 10 ohms Come and pretend you are smaller than me. you have something There is no need to do it. But how to apply it? So One way is either by applying this formula And let me tell you another way, Take the direct LCM of these three. So 10 15 20 The LCM of these three will be 60 Write it above. 10 * 6 = 60 15 * 4 = 60 20 30 60 this will be your answer 60/13 means your answer in just one line Will come. You don't need to go any further. Ok? Let us go. So this is our series of parallel The action has been taken. plenty of resistance It was important. Series of parallel. Very Questions are asked on series and parallel. What happened? Something has gone wrong. something went wrong Is. Everything I had written was erased. Let's go someone No. I will write it again. which is here Net resistance was what was that? So here The net resistance is R1/R2 / R1 + R2. Then what did I write here? Here I It was written that 10 ohm, 15 ohm and 20 ohm. in How do I combine all three? parallel Let me add it. So its net resistance is How do I get out? 10 20 30 10 15 20 Take the LCM of all these. So 10 15 20 LCM 60 10 60 15 * 4 = 60 20 30 60 so The answer to our question will be 60/30. This will be enough. I just used to play. Okay, I am coming. Yes, resistance has power and heat. tell this So in resistance when you get power and heat Let's say we have this question: There is some resistance R. Isn't it? We have this There is a resistance R and if you If the stream is flown then by giving the stream floater Keep in mind that heat is generated in this. This What is born in resistance? Heat It is created by flowing the current. So Let me tell you that whenever Heat is produced by the flow of electricity Is. That is, what do you people do with electrical energy? Are you creating C energy? With electrical energy, you People are creating heat energy. Electricity floaty and what be born doing? Heat. Give electricity to the bulb and heat it It is born. Heater Power Give Heat It is born. So whenever Ravi Vidyut If you make heat energy from energy then the current What is this effect called? then tell me Such effect of current is called current thermal effect of which you people call thermal They also speak of influence. The thermal energy of the current The scientists who determined this effect What was the name of? So tell me its true Who did it? Then the heating effect of the current The name of the scientist who made this discovery was Joule. Joule was our scientist who discovered the current Had given a solid description of the thermal effect of. thermal What is the effect? When you use electrical energy You create heat energy from it and call it thermal effect. They say. Who works on thermal effects? Is? If I may ask for an example of this, There are many examples of this, sir. Such as heaters such as bulbs like like press press press like this There are many more examples. fuse fuse You must have seen that the fuse has blown. And many more All devices that convert electric current into heat Work on impact. children after Let me tell you guys a little confusion. Should I give it? The fuses that are installed in homes Works on the heating effect of current. This But another related thing comes in the market. Which you people call MCB. MCB Has anyone heard it or not? of MCB Can anyone tell me the full name? Complete MCB What is your name? The full form of MCB is Miniature Serrated Bratter. Miniature Serrated Bretter: It works on the heating effect of current. does not. Keep in mind what this section works on Does it? This section works on the induced effect. Does. What does it work on? Maddened Works on effect. magnetic field of the current On impact. So there is a difference between the two And remember, fuses work on thermal effect. and once the fuse is blown will have to be changed frequently while the MCB will It cannot be changed. If it comes down once Pick it up. It is coming down, please pick it up again. Understood or not? Okay, let's talk here now. The formulas for power and heat Of the formula. So kids, take care Three formulas for power in electric current Have to remember. One is VI between V and I I² * R between I and R and V² between V and R / R then the power dissipated in any resistance There will be three formulas. P = VI² * R V² / R When these three Formulas must be heat modified. Heat is heat Multiply the time by 1. So heat For it will become V*I*T. I² for Heat *R*T will happen. for heat Keep in mind this will become V² / R * T. So heat multiply the time for and Multiplying time in formulas with powers Will not done. One more thing for you guys I want to tell you. A question is asked a lot Is. It will also be asked in your exam. Asked Let us tell you two units of energy T. What is the CGS unit of energy T? Is? What is the SI unit of energy T? Is? Which everyone will tell. But the energy T Another unit is asked which is called Commercial unit. And we are the ones who make commerce in Italy. Commercials speak in English unit. Ok? Tell me quickly. You can answer these three Give it quickly. Commerce Eta is also asked Is. CGS and SI, then accept the whole world She will give it to me. There is no doubt about that Is. Ok? So let me tell you kids Whenever the unit of energy is asked, SI units are known to the whole world. energy Its SI unit is Joule. CGS Unit The whole world knows what you say R. Now I will also tell you the relationship in this Give. But whenever you get a commercial Units are asked what are the units of energy Is? So you don't have to tell me the joules, nor I have to tell you Alt. Some people are also telling calories I saw them in the middle. No calories either I have to tell you. commercial energy units What happens is kilowatt hour. kilowatt Hour. Kilowatt hour which is a unit of energy it occurs. Power tee is not a tie. it There is poverty and I will tell you all That this kilowatt hour is 1 kilowatt We have 3600 kilojoules in an hour. how much is a? 3600 kilojoules. Many times this Megajoules are also produced. But 8 kg There are 3600 kilojoules in an hour. This thing you Everyone should be clear. So what do you want to tell Commerce Titai? Should know. Ok? Come forward children. After this, if I talk to you about How to find the number of units? So whatever you People pay electricity bills, that number is off You give it according to the unit and the number of The unit is nothing. Actually this It is kilowatt hour. Number of units something It doesn't happen. It is kilowatt hour. Number of unit. And how will kilowatt hour be created? Sir Whatever your resources are to generate kilowatt hours Find the wattage of the bulbs installed. among them Multiply it by the hour. total hours And divide it by 8000. This is yours Kilowatt hour is being created. so kilowatt hour How to make it? Take the full watt. Multiply the total number of hours in watts. Total Meaning all hours. If it takes 1 day If it is a matter then take the hours of 1 day. 30 days If we are talking then take 30 days of hours. Ok? Come on, come. So these are all our flowers You should remember it. Children, after this we The way we have shown resistance to the people Read the parallel equation of series resistance. series of power in a manner and also of power Have to read parallel. One thing for all of you children You should know that whenever this is said to you It is said that the resistance is connected in series What is the formula? Isn't it? So resistance What did I say in the series? Formula? So the resistance in series Remember what the formula was? R1 + r2 it was Formula in series. take care of children Sometimes power is asked whether power resistance How is it from? Power me in and take it in I'm leaving. Suppose we have this one There is a bulb. This is any bulb we have. Children, if I still have a bulb Remember, the filament of the bulb will never Doesn't change. The filament of the bulb should never The resistance of the bulb due to replacement Whatever happens is the same. Ok? further discussion Listen. Resistance will never change. Of. Secondly, whatever our All the bulbs that come are made for 220 volts. Are. If I ask you about your household If the supply is domestic supply then domestic supply What's coming in? So tell me it's domestic What we are getting in supply is AC Supply comes which you call alternating current You speak. AC supply and AC supply which The sound coming is of 50 Hz frequency. And 220 volts is coming. Isn't it? like now So let's say I have this, our first bulb. Is. So the first bulb, son, is the resistance R1 is happening the same way and in the same way I also made another bulb. in the same way What have I made? a second bulb Made it. So the filament of the second bulb is different Is. So the filament of the second bulb gets separated. The resistance of this second bulb due to R2 will be the same as itself. Our You are having beans. And because both of these The bulbs are to be used only in India. So Both bulbs are to be used in India. So its voltage is also 220 volts and its also The voltage will be 220 volts only. So kids when you put two or more bulbs If you use it then its voltage is 220 220 Will remain. And the resistance he has is his own You will have beans. If you change the bulb The resistance will change. But the India The voltage used in it is 220 V. It will remain 220. That is why I say that whenever Sometimes power should be given to any bulb. Any What should I give for the bulb? gave the power Go. This is the power of this bulb. so in that You guys should always always have P = V² / R Only the formula has to be used. This one only Why use the formula? Because We had two bulbs. Both bulbs are They had power of 20 watts and 40 watts. Because both bulbs are used in India Therefore, the voltage of both the bulbs is We have to do the same and resist. If the ratio is being asked then voltage and Using the Resistance Formula and from here it becomes clear that Power from our resistance will be inversely proportional. Our power It is inversely proportional to the resistance. Children, listen to one more thing. Power Resistance To inversely proportional. Now come here from here Go. The resistance in series is R1 + R2 in series so when you draw power Its reverse will happen i.e. 1 / P1 + 1 / P2 Will be done. 1 / P1 + 1 / P2 this is for our series The power formula has arrived. Tell me brother, is everything becoming clear to everyone? So Power formula for the series to all of you. Is it cleared or not? have any doubt So ask. Isn't it? Let's move ahead. Explain parallel power. So the parallel What happens when there is resistance? The resistance for parallel becomes R1 + R1 R2 R1 + R2 for parallel so what is power for parallel Will it happen? So the power for parallel is It will directly vomit. i.e For parallel, the power will be parallel The power for the term will become P1 + P2. Ok? Please comment once quickly Two. Is this clear to everyone or not? Is it clear? Now see how to ask the question Will you go? The question will be asked like this. 20 watts and Two 40 watt bulbs are connected in parallel. If yes, then tell the net power. then add in parallel If any remains, take 20 and 40 and add them. Bus 20 + 40 jobs finished. Added to the series So make it 20 * 40 / 20 + 40. Game over. Ok? And yes, whenever you are asked this question Ask as if he is saying 20 watt and 40 watt There are two bulbs. Two bulbs of 20 watts and 40 watts Is. Tell the ratio of both the bulbs. What is the ratio of resistance? So the power of Find the ratio. If 20 and 40 are to the power of Find the ratio of the two resistances and the ratio of the resistances It will be fine for you. Turn it upside down. Ok? Let's move ahead. one quick time Please tell me by commenting. Let's move ahead. Children, there is one more slide which they Didn't take it. I have to explain to you because But still you people always have doubts and It is my duty to give you good content. Children, there is an eight circuit which is called We short circuit. Isn't it? Short circuit. Understand this a little Let's see what happens quickly. and et There is a circuit which you people call open. Circuit. So short circuit and open circuit in You should understand both of them well. on both A question arises. Children, first of all I I'm talking about open circuit. open circuit What happens? For example, suppose I have I installed this 8 ohm resistance here, 20 ohms. or 2 ohms, let's say 2 ohms. Ok? And here I put at resistance and This is your resistance of 4 ohms or 4 Take the value of Om. Let's remove it. Four ohm values Take it. But here I have opened it like this Gave it to him. Opened it like this. done it And from here I said that brother this is open And from here, this is a 20 volt battery. Is. So tell me what should be the value of the current Needed? The value of this current has to be told. You have to tell the value of the current. So children, a Always keep this in mind whenever you are anywhere But the circuit may still appear open. like you Look, don't do it in such a way that two and four Connect them in parallel and then you will get current. No. Here our circuit is open. So whatever this The entire stream will flow from here. The entire current is generated by 20 ohms. Will go. It will run from 2 ohms. It contains the stream of The value is becoming zero. So where the circuit It opens, be careful there or here. Is the circuit open? So in case of open circuit In the branch where the circuit is open The current is becoming zero there. The branch in which The circuit is getting open and the current is becoming zero. Is. And where the current is zero, the resistance Maximum. I asked this line directly. Will go. Keep this in mind. Open means The switch is off. It was absolutely perfect. Open's It means the switch is off. Correct? in open circuit Current zero and current resistance maximum But when does the current go to the zero branch where Open circuit but current flowing is zero If the stream of children is not flowing, If you want to remove it, tell me it's a 20 volt battery sir. and it is fitted with a 2 ohm resistor Sir, the resistance found is 2 ohms. If the resistance is increased then the value of the current The current coming out of the battery is 10 amperes. Wherever our circuit is open, there The current is becoming zero. This thing is absolutely Correct. Let's see what a short circuit is. Children? What is a short circuit? This Understand this too. Suppose I answer this entire question I would have said that we have 2 ohms here. 2 Ohm's resistance is here. be careful Hear And here too I am a resistance Would have made it. Let's assume this is 2 ohms. Tell me. Let me tell you this. Let's say 6 Om. This is a resistance of 6 ohms. I told the person below that it is 3 ohms. There is resistance. Ok? And I said one more thing along with it. Here's what I've done this way, which is a Which is completely made like this wire. I did it like this. like this and like this Latte added. This way This way After adding more like this here also I put up a resistance. These I applied resistance. Let's say 4 ohms This is a 20 volt battery. 20 volts so you tell me if I I ask the current coming out of the battery How much should it be? Isn't it? I will ask this What should be the current I drawn from the battery? Needed? So you should know that When the stream came from here it will flow like this, it came like this Will go. So my brother, you will come and go like this, like this It will go, it will go like this, it will go like this. So here It found three ways. 6 ohm resistance in the upper path Is. The middle path is 3 ohms. And No resistance on the way down Is. There is no resistance on the path Get kids there take care of the circuit We get shorted. where there is no There will be no resistance there What will the circuit be like? It will be shorted. That is, whatever current flows, it will not flow from this It will flow, it will not flow like this. where at You're getting zero resistance right there. The entire stream will go away. The entire stream will go away. So children In case of short circuit, resistance is zero. You get it and how your flow becomes Is? Infinite. Infinite means here It is from the maximum. Isn't it? Meaning of Infinite From the maximum. So the entire stream goes this way It will come down. and will go this way, here It will go, it will go out like this. So if the children If the current is seen in it, it will be 20 volts. When the battery current goes like this, then 4 Ohm's resistance in the circuit here The value of the current will come to 5 amperes Got it directly from you in the exam Will ask: In a direct open circuit, the current is zero. Resistance Infinite Resistance zero current in short circuit Infinite okay brother Tell me, is it getting clear or not? Please comment once. quickly quickly Please tell me the comments. cleared or not Happened? So our electricity guy here Complete revision of the chapter that was going on Done. Yes, the current is always the one with minimum resistance Follows the path. This is for all of you It should be cleared well. So you People's basic electricity needs The concept is clear now. This much You should read these concept formulas. From this Your work will be done. Now our lever end The chapter on Simple Machines is about to begin. Ok? So all of you get mentally prepared. I will revise it completely soon. I give. Levers and Simple Machines You will also get more and more good examples. I will remind you of more examples in this. Two Give me a little minute, I'll give you a little Let me drink water also. As long as you guys are one Please share the bar session. to a quick session Please share it. I just came to drink water. Let us go Magnetism Magnetism Not very high Come. Magnetism is not in the syllabus Even if it comes a little bit. Isn't it? Ask the question about the bulb. of the question So you guys saw yesterday's class. Tomorrow I solved all the questions in the class. I will get it done. And the question about the bulb is nothing. Is. There are two bulbs. 20 watt 40 watt power Is. What will be the resistance ratio? So Power ratio 8 to 2. Resistance ratio 2 And 8 will be reversed. ask questions like this Will go. No more questions than that Will come. Please explain the concept of glow. Ok? One The child is saying, Sir, tell me the concept of glow. Give it. Let me explain the concept of glow. Listen. Isn't it? Children, always keep this in mind A concept will come that will make the matter shine. Such as Listen for a minute. A child is saying. For example, let's say I have 10 watts, 20 watts and 40 watts. These three bulbs were first I add to the series. And I will connect these three bulbs in parallel. I add. So tell me which bulb is better? Will it shine? Only this question will come. Who among these Sa bulb more flashy? so take care In the series case, the one with lower power He shines more. That means it has 10 watts Chamtera. Whose power is decreasing in the series and parallelly keep in mind whose power The more it grows, the more it will shine. To you There is no need to do any calculations. The calculations you Don't have to do it. So pay less attention to the series Power wala more chamtera and in parallel Take care my brother, you have more power More Chamtera. Ok? Ok. Yes. Let's move ahead. Ok. One Everyone please share the bar session. Let us move ahead. Now let's talk here Are. Of levers and simple machines. more than this Many questions were asked in your exam. Will go. Children, first of all you people in this Understand some headings. Like the Metantal Advantage Understand a little about it. Children lever some It doesn't happen. A lever is a rod. Lever One It is a rod. It can be straight or it can be crooked It is possible that there may be confusion as well, meaning there may be a problem as well. Can. So the lever is our rod. between which is our fixed point in this What do we call a fixed point, sir? We call this fixed point the fulcrum. Are. Fulcrum and remembering go hand in hand We have to apply load and by releasing this load To save us, we have to try P at the other end. Have to apply it. Efforts P children wherever We will always try to keep that point Our A will be considered. where our result We will call it C and where our load will be You must have thought that we will call him B. C Fulcrum This is happening, efforts are being made there and wherever If W is happening then we will call it B. result We have a kind of fixed point Which you people often call Aalam in Hindi also You speak. Isn't it kids? This which in turn This distance is the distance of effort. This distance we People will call the effort arm y. what did you say to y Will you go sir? y will be called ours. Effort arm It will be called the impact arm. If Army While Fulcrum If the distance of the load is asked, we will call it We will call it load x and this x will be called weight. Call the arm the weight arm or the load arm Tell me load arm, tell the children to everyone First, I want to explain one more thing to you. I have been. Any lever, any lever, this work It works on the principle of momentum. of the mole In principle, we have to move clockwise here. Have to take the foundation. going anticlockwise here Is. Make the mass of both equal. So Clockwise torque movement which you people You also say Aadhurn. Its formula was is the force times the distance from the stationary point. This is our It is a pillar. Force properties Distance from a fixed point. Tell me, is this it? This is our fixed point, children, if I If I ask the shape of W, what should be the shape of W? Will you go? W will become W * X and The effort of P will become P * Y. If I were here But if I look at another term, the W that has come in P Y/X has come up somewhere. Children, these It will be W/P, what should we do with this W/P? Will you say sir? This is what our w/p is called Material advantage is also known as mechanical advantage. This. So the material of any lever The advantage that M will have is becoming w/p and w /p What is it equal to, sir? will be w/p y / x or effort arm divided by load arm It is becoming equal. It is the opposite. above if the load here So up here is the effort arm. It is the opposite. w/p = y/x This mental advantage gives you Remember. Ok? Now listen further. Children, now we Let's talk about the direct lever type. There are three types of levers. And these three I can show this type of lever through a diagram. I will remind you and give you examples of this. I will remind you. children who are in first grade Keep in mind that there is a liver, This is our culmination, it is becoming stable in the middle. point in the middle while the second class which There is a lever in it, our load and yours in the middle The load is happening in the middle and the third Pay attention to the category lever Keep your efforts in the middle of drinking If you are in the middle then how can he remember it? Have to do FWP, FWP, right? What does FWP mean in the middle? Our result is first class W means load yours in the middle so Second and P attempt in between so our third Remember the result in first class Yours is in the middle, the load is on one end We will try on the other end I'll take a second to prevent it from falling apart. What will happen in the category, second category pay Our fixed point is the fulcrum, that edge Your load will be in the middle. Lie down, we have to stop this load, so concentrate We have to put our efforts upwards Only then will the load stop and the third class Tell me what happens in the third kind. This is our outcome, this is our outcome It will still be on the edge, this time the load will be on the edge But if the load has to be stopped then We will have to put in the effort FWP children now their mental Let's talk about the advantage. take care This is the third kind of lever, its mental The advantage is always less than one. Whereas the material of the second kind of lever Advantage is always more than one Always. While the first kind of lever The mental advantage can also be equal to eight It can be more than eight, less than eight It can also happen. These three properties are ours. May come in first kind of liver. Tell me, the example is very important. Example. of first class weighing Examples are asked a lot. between must be a stationary point. stable in the middle What does the point contain? One is our tachycardia Done happens in tachy. Other than this Our plan is done, it happens in that too. Also our mirror got shattered It happens in that too. Then the scales in addition It happened, it happens in that too. In the same way, one And then comes something that you call postponed. Hammer. A hammer is a hammer with the help of which Many times we would get stuck in the hanging molehill. Let's uproot it. T Hammer speaks This. This is also in the first class example Comes. In this way, the Trow comes once Times. With the help of the thro bar that children have We are lifting very heavy weights from one place to another. They move it to another place. Isn't it? he too What does it come in again? first class comes in the lever. meditation in the same way Keep the side break that happens too Which one does yours fall into? That too is yours It comes under first class lever. Sitel break site bread also first class There is leverage. So be it, be it a ploughman, Cloable Plus Cisa Swing Scales Site Bread All this thanks to our first class levers Will come in the example. children, if after I'm talking about second-order convex Example: In the second category, one should keep in mind The fruit is decreasing on one side and the other side But you will put your Tata. on the other side You will try and fight. The best of it An example is lemon crusher. Lemon Crusher Lemon Squeezer Machine This comes in first class and second class. Lemon crusher came as an example. children one And here comes the wheelbarrow. meaning of wheelbarrow a one-wheeled vehicle comes with a The garbage collector you pick up from the side It is also called a cart, wheelbarrow. Your set falls into the category Example Then what is the bottle opener? You have a bottle opener too. Your Second Kind of Liberty Example It comes in what you call a bottle opener. Bottle opener as well as an example and reminder Do it, let's tell him what we are Stapler Punching Machine Well I have used it many times Told not to put the stapler too deep Go because nowadays there are different markets There are different types of staplers. But generally when You are asked what kind of stapler If there is an example of liver then you are of the second kind of Explain with the example of lever. then after Your Sarota Sarota, which you people have seen many times You also call him a traitor. what is it in english Is it said? This is called nut traitor. This is also your second kind of liberty. It comes in the example. Common tut that you People pluck mangoes, right? Plucking raw mangoes is also like that. Which one does yours fall into? Second Kind of Liberty comes in the example. It's all set Kind of Liberty is an example. Ok? Let's go after this to the third kind. Let's talk about liberty examples. Third Taking Care in Kind Mental Advantage at from term. Third Kind of Liberty Example First comes your hockey state. Hot state that you guys play horse with. Then After this, the cricket bat became a hit. this also Your Third Kind of Liberty Example Comes in. Also your tweak is done Or the tongs used to make bread Also your Third Kind of Liberate It comes in the example. Children in addition Your human arm, your arms Sir, this also falls under your category? Human Arm too our Third Kind of Liberty If it comes in the example then it should be hot straight It's gone, it's become a treated bat, it's become a tong. Remember another example, you can do this through phishing. road. fishing rod Which you can call a fishing road. this also Yours is a third kind of example. Is. I mostly spoke in English. I wrote it brother. Hindi is written in Tam only. Is No? As for the wheelbarrow, the wheel Please write barrow in English. Isn't it? And all this in English like clip Hammer Claw Hammer claw hammer OK Crowbar Crowbar Tell me, scales mean balance Okay, so yes, pair of tongs are the same thing. Pair of tons means tongs, right? Don't go into the stapler, I told you before. Stapler in third, second, first Can also come. There are different types of staplers Are. Don't go to that. So let's ask more generally So you always tell the seconds. So this is our This should be clear to you people in the liver. Should be known. Now let's talk here But of a simple machine. Now this raises a lot of questions These are asked in your exams. children Keep in mind that direction is nothing. Is. Let me tell you, last time I had a question. What was the direction of rotation in the center? Is it happening? Look, as soon as you accept it The load applied here is W, so when If you try to lift it upwards then the load It will also go up and you will put in effort to go up too. If raised, the direction of rotation If asked, you will give the same direction of travel. Telling the direction of rotation is the same as telling seconds in but their if point of action line If asked for direction of action, the line The direction of action is different, roaming Key Direction Same Did you understand the matter or not? For example, suppose that You have the load here W now this load down like this Will come. Late when you try, try It is rotating clockwise like this and this too like that It will go up clockwise and anticlockwise. So their How is the direction of travel going? Getting beans. You are understanding the matter, right? So to roam Direction is being asked that their line of Direction of action is being asked. So The direction of rotation is the same and the line of You can see the direction of action in this. Line of action in the same direction It is the opposite. There is the opposite in this. Okay my brother, are you understanding the matter? Ghumnari Direction is a different question and line If the action being asked is different then it is different. Let's go to Simple Machines. Simple Machine Key I have just found the definition. The rest of it There is nothing special in the definition. Simple Machine There is a machine in which you put effort Can lift weights of. Look at this, this one It is a simple machine. This is also one of our simple machines. Is. Children, take a close look at this simple machine. See. This is our screw jet. This It is called wheel and axle. So wheels and axles. This is also our simple It is a machine. Simple machine refers to every machine in which you apply load and make effort You lift the load. Sir, please tell me once I got tired of freezing. Please sir, just once Tell me, I am tired of freezing. Hey friend, what are you calling me? come on sorry Keeping this in consideration, how many types of simple machines are there? So In your syllabus or should I say ITI In this we study six types of simple machines. Are. And you will know the names of those simple machines. Should know. So there are six types of simple machines. You all have already read 8 Simple Machines. This is called lever leverage. Come on now First Class Lever Second Class Tail No, the lever is a simple machine. in the same way Be careful about this, which is our pulley. Ours also comes in a simple machine. This Our screw that comes in this way also Ours comes in a simple machine. Similarly Our inclined plane comes from This also comes in one of our simple machines. Inclined plane. Similarly, remember our fifth number. Wheels and axles Wheel and axle, this is also our simple machine and the sixth number which is simple The machine is being called inclined. Plain Hod or Wedge Wedge is like an axe If there is an example of veg, then there are six types of simple There are machines and there is no other simple Keep in mind that there is no machine Okay, listen further, now these six ways To understand simple machines better Let's understand some terminology for this. I want to tell you something about terminology. Am. For example, suppose we have this pulley Is. As an example, children, if I I make the pulley a Fits pulley. it Fits pulley. And what about this Fitts pulley? I did that by wrapping the rope like this or A weight was hung here by wrapping a rope W. And I will take this same rope to the other side I am pulling from. This is our effort. When If you pull it downwards, try Will come down. Suppose the effort is coming down is the distance you attempt to carry the weight Yours will go up and the weight is say x The distance is going up which you can measure by x tore right So I will tell you about children y and x. I have already told you before what y is, I told y The effort goes to distance in English medium Listen, ift arm says w what means what is x then x is called weight distance what you call a load arm rest w and y about p Everyone knows. W is our load. P We try. Now Terminology First listen what it is? like most First comes what is the mutual advantage? Is? So any simple machine that we The material advantage will be MA, that should be taken The load and the applied effort will be the ratio. with/ We call p the mutual advantage. What is the second velocity ratio? The velocity ratio is vr and is equal to Sir effort distance and load distance. Effort Distance And the ratio of weight to distance will be what we call it. It is called velocity ratio. Effort distance and The ratio of mass to distance is called velocity ratio They say. What is input energy? Input What did you input? You input I have tried. Effort is a force And to make this force work, we have to travel a distance y. Had to do it. So the input energy will be What you are calling IE is input energy. The distance applied is P and the distance applied is Y. So the input energy will be P * Y What is the output energy in the output? output If load comes in then output energy will be The force will do the work of the load and X W * X is Our output became energy. Ok? Friction energy. Friction Energy means what was spent? So the input Let's say the energy is 100 joules. output 40 Is. So what will be the friction energy? Who It has been spent. Then the friction energy will be Sir Input Energy Minus output energy. Totally you guys like this You can extract fractional energy. Now input Keep the energy P*Y. Output energy W* Put X. Ok? So these five definitions are becoming clear to everyone. Input Energy, Output Energy, Velocity Let me repeat the ratio once. Look, what was the mutual advantage? w/p What was the velocity ratio? y / x then our What is Pass Input Energy? p * y output What is energy? w*x freshen energy what Is? Input energy minus output energy. What is efficiency? So tell someone Whatever the efficiency of the machine, the efficiency here I write. efficiency Efficiency equals output energy Divide by input energy, that's efficiency. Divide by input energy by output what is the energy then the output energy will be Whatever you got as output then load it in output If raised, w x and the input energy will be your p*y can we all do this To do the calculation with p, we can isolate x and Bringing down Sir y / x we ​​make different. w/p We separated. y/x separated. So All of you tell me what is w/p? These You have a mental advantage. and y/ What is x? Velocity ratio. So The most important formula for efficiency is Went. Momentum Advantage and Velocity Ratio Whatever will be the ratio, we will call it efficiency. Will say. What is efficiency, sir? Momentum advantage divided by velocity ratio We call it efficiency. Ok? Then write down the formula for efficiency. quickly. What is the formula for efficiency? Is it happening sir? The formula for efficiency is coming is the mutual advantage and velocity ratio Whatever the ratio is, that is your efficiency. Will be called. If you want to make percentage then you can earn from 100 Please multiply it. What is the ideal machine? it occurs? Sir, such a machine was called an ideal machine. We will go to the one whose efficiency is 100%. If it is called an ideal machine and it is 100% Material Advantage of Ideal Machine Both velocity ratios will become equal. Ok? Say. However, there is no ideal machine. Which machine is ideal? Tony. Real What is the machine? Real Machine That Machine whose efficiency will be less than 100%. And If it is less than 100% then it simply means It became that the material for the real machine Decreasing advantage and velocity ratio Ours will be more. So the real machine efficiency will always fetch less than 100%. Mutual Advantage Will reduce. The velocity ratio is high Will go. Correct? I want all of you to People should also share the session once. From. So that the number can increase a little more. Very All the children should understand because I I am going to do a complete revision today and Those who did not give even a little light Do it. light so I think at this time Should have reached 2000. one time session Share it to. The number will increase a little more Needed Isn't it? So all of these Do you understand the terminology? Because it will be used now. Isn't it? Oho Children, I just told you a little while ago Real machine told that sir real machine that machine whose efficiency is less than 100%. And It will be less than 100% real machine. But real There are two types of machines. A reversible There is a machine, an irreversible machine Is. reversible meaning in hindi Reflex. Reflex machine. and irreversible meaning in Hindi I means non-reflexive. what do you say Does he have it? Aa reflex. Children, first understand this as a reversible machine. And what is an irreversible machine? Reversible machine means that For example, suppose you have this thing that we have This is the machine we have, it has this wheel. what does the wheel say? If you If we are rotating it, then this load is ours rising up so when you put effort into it If you are rotating it by applying effort then this Where is our load lifting up so if you The effort was removed from this. What effort was removed? If taken, the load will come down immediately. Such a machine is called a reversible machine. In which if you remove the effort then the load reverses He started moving in the direction It is called a reversible machine. and my brother When did the motion in the opposite direction occur? when you Removed the attempt. Vomiting after attempted removal There should be motion in direction. Please take care. So in the opposite direction after removing the effort There should be motion. That is a reversible machine. And Ask any condition of reversible machine What is the condition of a reversible machine? So the condition of a reversible machine is Children's machine in which the output energy The value is greater than the friction energy. The value of output energy is the friction energy. If it is more, it is called reversible. And When this condition is imposed, then this condition After installation, the efficiency of this machine increases by 50%. It comes in excess. I can also proofread it. is not a big deal. But right now at this time It is important that you recover things quickly come. So be careful with the reversible machine. The output energy should always be greater due to Friction energy should have been greater than And the efficiency is always more than 50% of the children is an irreversible machine such as I have a screw jet as seen in the picture have shown you Children, this is my screw jet, when you If you turn this handle here, the handle This load after rotating is our load. will go up I know this, but after turning the handle The load will then go up and as soon as you release the handle If released, this load will not come back down. No, it will not come back down. Don't back down Will come. That's why this is our irreversible machine Is. An irreversible machine means a Such a machine. a machine in which if you load you remove the effort, you remove the effort, You withdraw your efforts. then load back down Did not come. Don't come back down. This is what we people What do you say sir? This is what we call Are irreversible machines. So you tried When removed, it remained at the same place as it climbed up. continued climbing or remained stationary in the same place and He remained stationary at the same place. That is why this machine It also has another name, Irreversible Machine We also call it self-lotting machine. What do you say? Self-lotting machine. Self Why did you say loting? Master Sahib, where were you? Staying there. Why did you stay there? Because There is more friction in this. That is why meditation Keep this machine when you are asked about its condition I will go and tell you brother about having an irreversal machine. What is the condition? What is the condition? So twirl Its condition is that the output energy in it Its value will decrease and friction energy will The value of will be higher. This is its condition. Friction due to high friction More than what? is greater than the output and Self-image is higher than the output The efficiency of the lottery machine is known to my brother. comes to less than 50%. Ok So I'll retall you once again. Am. Ideal machine efficiency 100% then real Machine efficiency less than 100%. Real machine two types Must have been. A reversible one whose efficiency is 50% More reversible in the reverse direction than This happens because it contains fractions There is a term. Term from whom? Output Energy fewer. So the output in the reversible machine More energy. Reduced friction energy. Irreversible machine is that machine in which The load must be removed and stabilized Go. That is why it is called self-lotting machine. Are. There is more friction energy in it Is. The output energy is decreasing and its The efficiency will be less than 50%. Tell me Please comment quickly and tell me No problem with both machines. If yes, then tell me this chapter quickly. Not too big means fewer things It will be revised in the near future, everyone here will know about it. It has been cleared Weight ratio equals effort divided by weight No brother, look and listen carefully to what Material Advantage of Velocity Ratio I did equalize that for leverage are equal when efficiency is considered to be 100% Go. Yes. Ok? Come on, come. Take this Children. After this we will have to use the machine. The rule needs to be understood further. In the law of the machine we what do people do? In the law of the machine we What people do is that on the Y axis, what we We take it, we take it, try P. And We take what we take on the X axis. Let's take load W. Are you understanding the matter? Correct? And whenever you If you are asked the rules of the machine, then the rules of the machine You have two drafts in. First draft will come in which this draft of ours will start from the origin point Will be seen going. going from the origin It appears that if your 10 Newton to lift a weight or anything weighing one newton If you have to lift a load, then try in the same way. It will keep increasing. So from the origin, Its equation will be y = mx Since p = mw is the sibling of y in p. What is in y? If p then y in p then y = mx similarly p = mw But this is the graph in which our machine It will be ideal or you can say that whatever is in it There will be friction, that will be our zero. It must be so brother that the friction is becoming zero. A little force, a little effort, immediately The force is lifting the weight lying down if this machine It is not ideal, it is real, it is real If the machine rises from above then if it is real then the machine Where will the graph of the law arise from? Over that. This is what real means, my brother. that the fraction in it will be zero Not there. So for the real graph this is The equation that follows is p = mw + c What happens? Sir what is c? c would have Tata end on the y axis. This C. Now in this You will have to remember two formulas. I Let me tell you. In this you will get the first formula You will have to remember. according to the law of the machine Remember the formula for maximum mutual advantage have to do it. and remember the formula for maximum efficiency Will have to. You will have to remember these two flowers. So Maximum Mutual Advantage Test Nicklera. Tell me children about the mental advantage. What did I tell you about the formula? w / P Did you tell me or not? So from here if you take out w/p w/p p then The maximum advantage will be 1 m. So Direct attention to maximum content Advantage will come to 1/m. And what is maximum efficiency? Maximum efficiency occurs above the material Advantage whose value you should maximize Is. Your velocity ratio below. So you tell me if the maximum mutual Talking about the advantage, it has reached 1m. And velocity ratio is our vr. So this Two formulas are important. any machine Maximum Mutual Advantage in Rule 1/ m remained. Maximum efficiency 1 / m * velocity Ratio. What is m? m is the slope. Weight * Weight arm effort times Effort arm. Yes, you can remember this also. No one is that Is. Correct? Now children, how do questions arise on this? Let me tell you this. For example, suppose that I gave you an example. Is No? I gave you an example. I told you this. I told you that in the law of the machine This is the law of the machine. P equals 0.4 MW + 220 This is our machine rule. Any Machin's law for the machine P = 0.4 * W + 220 This is the law of the machine. And then this from you He will say that if the efficiency of this machine That too your maximum efficiency is 75% yes So you tell me the value of velocity ratio. Such questions are coming up. the previous question They were very easy. Row A v² Row A is the larger of the two. There is confusion. Please explain a little. Hey, ro aa v² is the formula for force. CryA v is the formula for power. that it. Ok? So kids, tell me something about this. Don’t want to do. First of all, what should you look at? So This value is called m. So you I simply said, Sir, the value of m will be 0.4 Which you guys can also give 4/10. Ok? Now you tell me this if I am here Using the formula for maximum efficiency from If I were to do this, the formula for maximum efficiency would be Just now you told me sir 1 / m * velocity Ratio Maximum efficiency is 75% which you can 3/4 can you do 1 / m value 4/10 four Up will be 10 means four down 10 up and From here we have to find the velocity ratio If you see, this formula has been used many times by us. If it is useful for children, then four to four will cancel out and the velocity ratio value If asked, we will simply be 10/3. I will call it velocity ratio. Tell me what is the confusion? Is there any problem Is? Ok? Let's move ahead. Now look now kids A couple of small things in this chapter That's all that's left. Like you have a full liver read off. Lever: Six types of simple machines. I explained it to you. So liver you read the whole thing Have you taken it, children, take care in the pulley? Fits are pulleys and one is movable Pulley ok so fits pulita whenever you If asked for velocity ratio, always say one. If you ask for the movable pulley velocity ratio Tell me two, remember this inclined He also asks for the velocity ratio of the plane. The velocity ratio of the inclined plane is is 1 sinta What is sinta? sin theta inclined plane The angle is. For example, suppose there is an inclined If the plane is making 60° with the horizontal then 1 Do /sin theta. But theta meditation Keeping is the angle made with the horizontal. For example, suppose an inclined plane is made. This angle should be theta. Kids Wheel and Axle also have velocity Ratio asks a lot. of wheels and axles The velocity ratio is what it is Wheel radius divided by axle radius. Or If asked in diameter then wheel diameter divided axle diameter And don't think about the rest of it. Ask about wedges and screws, this much Won't ask much Wheel Axle asks Enough If there is no sound, how can everyone else see? brother, if the sound was not coming So how would everyone else be watching? Isn't it Hey, MA and sin velocity ratio you Understand it as equal because the formula we are using now They will use it 100%. We will give it and where it is not happening 100% Efficiency eta equals mavr will use. okay brother? So this was our topic in which we Had a lever television installed. So the lever explained Explain the types of levers. example in that Tell me. Isn't it? I did a little work on the machine Told about it. Explained some terminology. About Reversible Irreversible Machine I come a lot. And also by the law of the machine, our Questions are asked. Ok? Come on here then But our second chapter was complete. It's finished. Now we are going to discuss Those are about speed and velocity. Ok? Discussing speed and velocity There are. So everyone is absolutely ready. Tell me quickly. Discussion on speed and velocity Are going to do it. This is also very important. And yes, I told you not to worry. I made an error Virar has taken everything. The question you guys ask in the group I see that Student competencies not asked too much Will go. So you should understand that the entire 100 I can cover the syllabus of 6 hours in 7 hours. I am teaching. This means that I I am telling you something important. Which is very important. Isn't it? Let's move ahead. Please tell me the start By commenting. Ready sir. Ok? So speed The very first heading in End Velocity He tells you about distance and displacement. I need to understand a little bit. Then we speed and Let's understand about velocity. Question We will come tomorrow, didn't I tell you today? Like you read the theory. Tomorrow I am a great I will get you 4,500 questions solved after revision. Together. We ask this question daily. There have been many in previous classes too. Ok? Let us go. So children, first of all distance and Understand about displacement. such as the value Suppose you are at point A. You go from A to B Then you go from B to C. Then you go from C to D. are. You went from A to B, B to C, C to D. it You went on the eight way. So whenever you If distance is asked, then distance means only It so happens that whatever path you have taken, The distance you traveled on that path or Connect your path to it. This distance Is. But when we talk about displacement, Displacement means the end point Join it to your starting point. I again I repeat from. The last point you Join the starting point. So this thing that Comes what you can call DA. it displacement Displacement which you can call displacement yes. So displacement means between the last point and the final point distance. end point and starting point Distance is what we call displacement. Is No? So you will understand both these things well. It should become clear. wherever the distance goes Yes, that is the distance and the displacement is the initial Add the last point from the point Give it. This is our displacement. We make this a Let me explain it with something else. For example, suppose that You are in some circle, right? Let's assume You walked from here to there in a semicircle yes. Did not go around the entire circle. full circle it is. Where do you take it from in a semicircle? Where are you going? So suppose you are a Starting from this point A in the semicircle You have reached this point B like this. And the radius of this semicircle is called R I have said it. So tell me what is its distance? displacement What will happen? So if I ask its distance So the total distance is half of this. It will happen. Half perimeter means this distance is called The full perimeter is 2r half the perimeter * r π * But when you talk about displacement, The displacement will mean the distance from the starting point distance between endpoints displacement is the displacement from the starting point The distance between the endpoints is The distance between you can do 2r diameter If you can equate distance and displacement They are different, not the same. this thing All of you should remember this, children. Now I If I talk about speed and velocity. Good Keeping in mind the distance and displacement displacement is your vector of this kind What is amount and what is distance? then say Give distance is a scalar quantity. Whenever I talk about speed and velocity If I do this, there will be a difference between the two again. Will go. Whenever you talk about speed Whenever you talk about movement, the distance above Down to take your time Whenever you talk about velocity, which you If you say velocity then add it to the velocity formula above Your replacement should be Down must be your time A lot of questions were asked in this previous The bar is the distance/time speed. displacement divided Time is velocity. And let me tell you about the last Many such questions came up many times in which every Was going from bar A to B. coming from B to A Was. Displacement zero. If displacement is zero then Velocity Zero. displacement zero then velocity Zero. Now let me tell you one thing here. I know that there is a speedometer available in the market. Do you know it? fitted in vehicles Speedometer. Kids, what do you think of a speedometer? Does he tell? at the time you are walking Indicates the speed of. So the speedometer tells you If someone asks what does he say? So the speedometer You get instantaneous or instantaneous Instantaneous Indicates instantaneous speed. instantaneous Who tells the trick? Speedometer. Does not tell velocity. Does not tell velocity. This instantaneous Indicates speed. At the same time you are walking Telling the speed of time. anyone other than him You are not telling the speed, right? Come on then move and You understand what velocity is. Children? Now we have to move away from here. Now this slide is important. Children. You should understand about average speed. What is average speed? Whenever you have someone Average speed in motion will also be asked. Average speed. So average speed means that you Suppose you ever went from Delhi to Patna. The speed of the car was once 60 kmph Sometimes it was 150, sometimes it was 120, there were many different speeds. So you will be asked what is the average Average simply means that whatever Your total distance covered is above and enter your total time below. So, total distance divided by total time is what we call it. It is called average speed because we calculate the speed. If the speed is then the total distance divided by the total time is our average It will be called a trick. Okay kids? There are two special cases of this Let us assume that the distance in the entire journey It should be equal to the 60 km distance from Delhi to Bombay. Came from Bombay to Delhi at the speed of per hour 90 km At a speed of per hour. So when Whenever the distance travelled is the same, the distance It is the same. So keep in mind the average speed. The formula that applies when the distance is equal At that time the formula seems to be 2v1v2 / v1 + v2 when the distance is equal nor if the three If it is three then 3 / 1 / for three v1 + 1 / v2 + 1 / v3 is to be applied. yes this this Just right for two. if right here What would happen to us? If there were three, then for three This one seems to be of average speed. Step up three 1 / V1+1 / V2+1 / V3 It looks like three Ok When to apply late when the distance is the same and Children, if I have the same amount of time, Yes, as I say, in the first hour I Was going from Delhi to Patna. First 1 hour My speed is 80 km. It was per hour. Next hour my speed was 100 km. Per It was an hour. For the next hour my speed was 150 km. It was per hour. So tell me the average speed. So When the distance is equal, the children The formula for average speed is goes to v1 + v2 + v3/3 v1 + v2 + v3/3 is our average speed Has been. If it is two then do v1 + v2 / 2 Give. Work is done. Ok? So learn to calculate average speed. Take it. Because at average speed there are many Questions are asked in your exams. Are. Let's come. What is it now? Yes, four You told me about that too. Ok. Any No problem. The one with four will not come. Yes, But listen to one more thing. If it is in both Nothing is being said from there. So You have to apply this same formula. Total Distance divided by total time. Yes, total distance divided by total Time has to be invested. So whatever your distance Making x1, x2, x3 put them all on top Add whatever else is taking your time. t1, t2, t3 put them all down. So the total Distance divided by total time, then you have to invest in it At average speed. The condition is stated So, conditional formulas were applied. Isn't it? Let's move ahead. Come on then you guys Four formulas and memorize them well. People. Read all the videos available on YouTube. Please bless me. absolutely mine Blessings. You studied well Will happen. If you want to study from whomever you want, then your There will definitely be selection. Ok? So let's now talk about acceleration and force. Let us understand a little about it. children Remember to use acceleration whenever it is mentioned. It is called acceleration. So the acceleration means change in velocity Divide by time. This is our acceleration. a equals deltaV/delta t unit of matter If you do this, the unit will become Meters per second squared. If we talk about insurance, I am in insurance right now. I will teach you how to take it out. lt will become - 2. And Three things you need to know about acceleration I have to remember this. Whenever children accelerate If it becomes zero, then our velocity at that time will be It will be constant. If your acceleration is in plus It is positive. So at that time the velocity is constant will increase and your acceleration will decrease if it is minus If it is in then the velocity will continuously decrease at that time. So acceleration is the change in weight. The rate is. No rate of change of speed Would. Take care children. matter of force We do. So the formula for force will be Your first formula will be f = m * a Many times, instead of this acceleration, we DeltaV/DeltaT can also be opened. These The formula for calculating our force will be For any particular motion. Particular We can generate force for motion. Children, if we use SI units of force If we talk about the SI unit of force then it is Yes Newton. Let's talk about bulk order CGS units So our CGS unit becomes dyne And we have bulk orders for MTS units. If we talk then MTS is the unit Children, Clodam Force is very important. Clodum Force is asked a lot Clodum The force and its relationship are also very important. 8 Newtons is equal to 10 Power 5 is die and remember 8 Kilogram force is equal to 9.81 Newton. Please take care. Whereas what is momentum? meaning of momentum What is? So to say that emotion means is m * v mass * velocity. Then momentum p What will be the equivalent? momentum p is equal to will be m * v mass * velocity. Impulse You have a vector quantity. vector, right? It's all this vector. Whether it is acceleration, Be it force, be it momentum, be it impulse Yes, all are vectors. The unit of momentum will be kilogram of mass per velocity meter Seconds. So kilogram meter per second is The unit of our momentum will be p = m * v. Children, if we talk about impulse, The impulse that occurs is impulse I. Momentum change. Now here's a little confusion for the kids. it occurs. Look, I will tell you. just emotions There is a change impulse in it. just emotions There is a change impulse in it. But if I If I give the rate of change of momentum The rate of change of momentum is called our force. That too is an external force. Isn't it? So there would be a lot of confusion between the two. It is for the children. So remember it well Please take it. See, only momentum will change. Just the change in momentum will be our impulse. But the rate of change of momentum is is equal to the force. Yes, whatever strength and quality time tells I am going to tell him that he will also come from here. Look at the momentum The change which is delta p is taken from there Keep the value. So when the momentum change If we keep the value of delta p then force th time interval i.e. I = f * delta t this also The formula will become our impulse. This will also be made. No problem. Ok? Is it clear? Let's move ahead. Ok Children, after this when we study acceleration , then after reading the acceleration we People need to memorize all three equations of motion. Will fall. So all three formulas quickly I I will get it revised. Isn't it kids? The first element of motion for horizontal motion The equation is that v equals u + The second equation of motion is equals ut + 1/2 But you people can solve the second equation of motion like this You can also write the initial velocity and Average of final velocity Time is also your second equation of motion. Is. s = u + v / 2 * t its also many times Will be used. Listen carefully. and which The third equation is v² equals u² + 2 as this is your third There is an equation. Children, these three equations You should remember it well. These three You must ask questions on equations in your exams. Will go. When you read these three equations, You will get a special TV running in seconds. The distance also has to be remembered. Isn't it? twenty seconds In. Then find the distance travelled in the set The formula for this will be u + 1/2a And Arya, keep in mind, it will be 2t - 1 like Specially tell me it started in the 10th second Tell the distance if it travels in the 10th second He is asking about the distance in the 10th second. Use this formula and it will be said Tell the distance covered in 10 seconds In 10 seconds it was gone in 10 seconds If distance is being asked then this formula Use it Okay brother. Come on kids, this is the equation when we People use it for vertical motion. If you are in vertical motion, be careful which The first equation is v = u + at where v = u + gt It is made. The second semimeter is s. goes to your h equals ut + 1/2 gt² and Datira which is the third semimeter sir, it becomes is v squared equals u² + 2g This becomes your third centimeter. Is. So for vertical motion where your Acceleration a was there g do it. Where your ego was distance, displacement This is displacement, we put h there. Are. Now you should understand one important thing here. Children, Listen to the value of gt. When The ball will be thrown up, so pay attention up. While going, we have to take the value of g minus. ball If it comes down then how will we get the value of g Do you want to take it? I have to take plus. This is about you and Remember it well. Brother, when the ball is up When you throw, the velocity continuously decreases. Isn't it? And if you throw it down, the velocity It increases. So the velocity is decreasing. g is negative. Velocity is increasing so g is positive. So while going up and down The value of g of any ball while throwing it How should I take it? This is good for all of you It should become clear. Now there is one small point in this. Comes. Many people are confused. One comes to the rest position, stationary point, and then one is the starting point. what about both Is there a difference? I'll tell you a little bit about this I want to tell you. children, whenever and wherever But also Rest Position Ira What do you people call a fixed point? What is this called? stationary point and I saw the initial position The initial position is called initial Point is, rest position means this Fixed point means initial The velocity is zero, that's what it means Rest position meaning and initials The starting point means that the time The value of is zero, there is a difference between the two Therefore, both these words should be used properly. Please use it Ok? No, no, initial point like one Look, the child is making the same mistake. Parvez Parvez is saying initial point means Initial velocity zero incorrect. I value Take the initial 10 meters per second from the initial position I am beating the object. So what is the initial Is the speed always zero? No, right? The rest position you call stable point or stationary position in that u0 is zero Initial means beginning and Initialization means time zero Okay, so don't make any mistakes in this. Then what is it, then everything will go wrong. The question is, children, these three are afraid. The equation I gave you is v = u + at s = ut + 1/2² v² = u² + 2s In which place do we have to represent, sir? We have to represent this in a graph. In. How will it be represented in the graph? I will explain that to you also. Children, you I want to explain one more thing. Little Come on this one, motion one. Look at the question several times You are asked to determine the first form of motion. The equation gives the relation between titrat titrat Is. This is what is asked. So remember that whenever Sometimes we read any question. Always pay attention when reading any question. Keep the initial velocity given to us. And acceleration is also given to us. And Listen to one more thing, the kinetic equation is valid only then What should our acceleration be like? Be constant. and the initial velocity which It will be given that will also be our constant. So The equation of motion tells the relation between If you are in this then only you will get the initial You have to carry velocity and not acceleration Have to take it away. The equation of motion is valid only when The acceleration will be constant. take care The equation of motion is given by acceleration constant It is valid. Otherwise the equation of motion is not valid. Is. Isn't it? be the acceleration constant Needed So it will be asked that the first equation of motion Whose describes the relationship between whom? So we There is no need to take initial velocity. Us There is no need to take acceleration. So the speed of The first equation gives the relationship between velocity and Between time. speed second summit between Tells. In that we have to take acceleration I don't have it and I don't want to take it either. So in motion The second equation, s, means displacement and Between times. Relation between displacement and time Tells. The third equation of motion has come. There is no need to take initial velocity. There is no need to take acceleration. So the speed of The third equation gives the relationship between velocity and between displacements. Ok? Okay tell me one thing Rati, the second equation which The relationship is telling The second equation gives the relation between the two I will tell you both the things, who will tell you? Which thing is right and which thing is wrong, fear The second equation describes the relationship between distance and The relation between time and displacement is and time is describing the relationship between the two what is correct from ok distance and displacement distance and time between is telling that between displacement and time I am telling you, tell me by commenting, I will tell you a little I will come after drinking water, till all this remains Shiva Let us go Yes the displacement and timing are correct. Ok? That is absolutely correct. displacement and time The answer is absolutely correct. drink water All of you too. And please share the session once. People quickly. Those who haven't liked it, please like it. Isn't it? Now I am going to explain the graph to you. I wonder how the graphs of these three will come. Children, first of all you must understand that In graphical concept we have to write the equation of motion as Have to represent. So when the equation of motion is written If you want to represent, how should you represent? will be? That's what I'm going to teach you now. What does the first equation of motion say? Was? The first equation of motion was v equals u + at Was it there or not? In the first equation, v is There was a relationship between and t. Isn't it? Ok. So there was a relationship between v and t. So So where did we take velocity on the y axis? In. And where did we take the time t? x In Axis. Children, look carefully. v = u + at This will give an equation which has one origin It does not go from the origin but over the origin If the line is drawn then the first equation of motion Explains the relationship between velocity and time And its graph will be v = at + u at + u I am saying this because it An equation somewhere of the form y = mx + c Is. take a look kids but here's the initial velocity u is not zero. butt if initial If velocity is taken to be zero then this How will our equation turn out? So the initial If we consider velocity u to be zero. If yes, then take the initial velocity as zero. If taken, it will be closer to Summit Origin. While doing this he was giving me the line. kids if it u 0 If this is done, the equation will become v equals at. If you look carefully at the velocity and time graph In this way, the relation in the equation will be Velocity-time graph which is a straight line The line will come, okay, secondly, these children will In this way we have to make the relation s = 1/2 at² This time we take the initial value of ut + 1/2 at² First we will assume velocity to be zero. When the initial velocity is considered to be zero then s our top and time us on the x axis I have to take it children. And whenever the square If the shape comes then it will come in square shape. Parabola always rising from the bottom up Will come. This equation is not a straight line Is happening. So how is this equation of ours going? This is our parabola. It just has the initial velocity becoming zero. Is. Letter Initial Velocity Not Zero Is. If anything, this graph appears slightly above the surface. Will go. It will come like this. It will come like this. these ones Initial velocity is not zero in the graph Will happen. Both graphs are our parabolas. Will be. Children, if we talk about the third equation of motion then v = u² + 2 as initial I'm currently running at a velocity of zero. Brother. So should I consider it zero? So look at v somewhere or the other 2s will come. We have to keep the acceleration constant. So We wrote the velocity on the y axis. We wrote the displacement on the x axis. Are you listening? And whenever under route If a relationship comes then the one which is under route Relationships happen, children, from top to bottom. A parabola comes towards. something like What is this even ours? This is also one of our is a parabola. So when we have the three semi-products of speed The battery shown in the graph is low. Let me I will change it. Arya Did not come. I have arrived. Let us go. Then the three equations of motion are When we represented, which ones Draff came? Look at this draft. Isn't it? Now Children, after this the graph is still very big. Is. So let me take a look at the graph one more time. Let me explain. You can do things with me a little bit Understand this. Children, whenever you have exams If he ever asks for the graph, you guys always say no. Asks a lot about two things. One will ask a lot about slope and the other What does its area tell you about it? He will ask a lot. Ok? So suppose I I told you that we have prepared a draft which It is formed between the y axis and the x axis. Let's assume We have drawn a draft that is on the y axis and x is drawn between the intersections. Now carefully Listen, listen people, anyone in the world If any question comes, you will answer it. The voice is becoming tool two. It should not be so Needed Please comment and tell me if the sound is correct. Is? Is the audio correct or not? Come on let's go Silent. So I told you that like the y axis And between the x axis I have this draft If we draw the slope of this graph and the draft of this graph, What did you say about the area below it? How to check this? how to remove Are? I am discussing that matter. Children, whenever slope is asked, then slope I don't want you to do anything. lay y up Is. x to be placed below. and by doing y by x What should I make? Find its unit. Just from the unit it will become clear that we What's going to be revealed for the slope and For area, consider y and x. Multiplying by multiplying Then make it a unit when y and x If you multiply it, you will make it a unit. Please tell me what its unit will be. Meaning, the most important thing will be slope and area. What does it tell me, I will see its reality. Let me give you an example as if you were asked this. I am going somewhere sir, I have velocity And draw the time graph, children velocity and A time graph is drawn. Tell me velocity time What does the slope of this graph indicate? And what will the area of ​​this graph tell us? I Suppose I asked you Sir Velocity A time graph is drawn. Slope and Area Tell me. you know nothing. I am saying Yes, you don't know anything about x y z. To you I asked Sir, please tell me its slope. What will it tell and what is its velocity? Will you tell me? Meaning, what will the area tell this graph Of? So you just look at the quantity. Sir The unit of velocity is meter Seconds. The unit of time is second. When If you find the slope, the unit of velocity will be above Write down the time in meters per second squared. Went. and meter per second squared will be Acceleration. That is, its slope is the acceleration I will tell you. Area area means both Multiply. So seconds per meter * seconds. second to second tensile meter meter unit There is also a matter of distance and also of displacement. is because you took velocity Velocity has been taken, that is why its What will the area tell us? The displacement will tell ok its clearing up tell me quickly The first example, the first one is this This is an example for all my brothers. It is not clear to the brothers At example, I will also give you from my side Should I give it? Let's say the next Example: I asked you. next example I asked you sir I have a draft Made. Now I have made that draft. Force And Between displacements. i.e. Force and Made between displacement. Tell me. Force and Made between displacement. of this draft What will Aria tell me? Please tell me quickly. This draft was made of force and displacement. What will Aria tell me? Tell me. This is the second Example: You robbed me. In the same way, respect Look, I have asked you this draft. Example number three. Example number three. Example number I The third question is that Sir, the draft which I have prepared Made this time This time I have made a draft. Made between force and time. Made between force and time. tell this Specify the area of ​​the draft. What will you tell me? Made between force and time. Hear Isn't everyone there? And suppose here I asked you example number three. that I made a draft again sir and this I drafted you this time. it The draft I made you is a displacement and the time between. Let's assume. I have made this draft displacement and Between times. And you can quickly give me a slope of this draft. Tell me what the slope of this graph will be. What will he tell me? If I ask you such questions, then do it. Please do it sir, you understood it so well It must be given. to be absolutely Needed Children, first look at the area What did I say? multiple of the unit Do it. Did you say that or not? unit of force Newton is happening. The unit of displacement is meter. When Newton and meter are multiplied So it will become joule and joule is the unit of what? Does it happen sir? The wire has joules. So the force and The area below the displacement will be Give you the work. It's a simple thing. Force And if I If I multiply the area then the force Unit Newton because it is finding the area and the unit of time is second. Newton second In which force and time are being multiplied. That's why the stretcher area is giving you impulses. I am giving impulse. Are you all listening? Third example Come in number three. displacement and time The slope has to be removed. I said slop Do not multiply. Have to divide. So The unit of displacement is meter. unit of time seconds. That's seconds on the meter and here There was displacement. That's why you don't call it a trick. Will you say wait? Then displacement times draft Whatever slope there is, give it to me. Wet Ok. Tell me. It's becoming clear to everyone So according to me you people will like the graph a lot. It must have become clear well. Isn't it? Well, there are a few other things I I want to tell you. Listen carefully. When You people will solve the question, which means your You will solve the questions in the paper, there will be many in it All things will come. Isn't it? like I Let me tell you, this is very important. This is what will be asked most. It will be asked whether Listening carefully for uniform velocity Brother, everyone. For Uniform Velocity Please show me the graph. What will the graph look like? Uniform velocity means that At the same weight for you. How is our weight? Is it brother? Our weight is the same. So wait Our ate is the same. So you give me these three Tell us about the draft, all three How will the draft come? You understand the meaning of all three drafts, right? We also need to tell displacement time, velocity Time also has to be told, acceleration time also has to be told. Suppose we said that Sir, some body A similar motion is taking place by. Uniform Velocity motion is taking place. uniform weight It is happening. So for a uniform weight you can give me Also explain displacement and time draft. Should I come? For uniform weight, we also need velocity time. Tell me how should it come? And for that we need acceleration and Please tell the time also. What should be the acceleration time? Needed? Such questions will come. So children, I also tell you this I am teaching. Very carefully all of you Listen, how will it come? One thing, all of you Tell me this. What is written here? Uniform weight. Equal weight means that whatever its velocity will be, it will be our Will it be constant or same? So be it. Sir velocity is our constant. If If velocity is constant then first velocity So find out where the velocity is? so say This is the velocity sir. So Velocity If is constant then for velocity like this The horizontal line will appear because the velocity We have constants and we have to make them constants. So draw a horizontal line. Ok? Well kids, velocity is constant. If velocity is constant then horizontal line Pulled it. Now you have to draw the draft. Displacement time Draff. Now here you Must know displacement time draft Look at the slope of displacement time The slope of the draft gives the weight Is. So a graph should appear in it in which Let our slope be constant and the slope It should become constant. This is possible only when the A straight line will appear. brother simple line Will come. That's why you see our slope everywhere How it is? Everywhere slope is our constant Is. So displacement time graph at inclined line weight time graph horizontal line but The game is still pending, including acceleration time. the graph is asking. Children, I love one thing People tell me if your velocity is constant If so, what will be the acceleration? then say Give me acceleration, sir, it will become zero. If the acceleration becomes zero, where will the line be? Pull? Draw the line here. There is something here You will get acceleration sir. draw the line like this You will get acceleration sir. So we Acceleration has to be reduced to zero and acceleration The graph that will come out reducing it to zero is this Will come. Make it in time x. Because time will keep increasing. But with the passage of time, acceleration What is ours? Zero. Tell me Are things becoming clear or not? Well, let's say this example number In Zero One I said equal weight. Isn't it? I am telling you the same thing, the same thing. Can in example number two that Sir Mann Understand that whatever our object is, it is rest is in. How is the item? Rest in Rest means it is stable it is stable so it is stable Brother, please do me one thing quickly. Make these three drafts and show them. Suppose If it is stable then all three drafts are given to me again. Make it and show me and these three questions will be asked. from you Which three displacement time drafts Tell me how the velocity time graph should look. How should one approach rest and acceleration? How should the time graph look for rest? The object is in our rest. at rest Ok? So you will say sir is at rest. Rest means that its velocity It is becoming zero. No velocity zero It is happening. This is what rest means. Then its displacement s is ours. Remained constant. Brother, stay where you are. I am at rest, I am at rest, but I am at rest If so, what will be our velocity? Zero It will happen. Now tell me sir what should come? So If it is at rest, if it is at pause, then displacement constant then displacement constant So it will come like this. Displacement is constant. Displacement is not zero. Velocity is zero So if the velocity is zero, it will come here. Velocity zero will come like this. Time is always Have to increase. Time will never be lost. Time Always use the arrow in an upward direction. Ok? Come on. If the velocity is zero then You tell me what will be the acceleration? So tell me when the velocity is zero, Acceleration means velocity is not increasing So what is the acceleration going on? Zero. If the acceleration is also zero then the acceleration The draft will also come like this. acceleration Time draft will also come like this. Ok? Now after this you tell me if I will also ask example number three here. I will take it. These three examples will come. look like Eight times I made it for rest. Eight times I made eight equal speeds Shown. Now I'm going to show you how to make it et similar For acceleration. that you can speak to Unif Acceleration. Unif exertion. When children unify Acceleration comes and the driver asks you what If Draff asks, you know. that our speed for uniform acceleration The equations work. So while making the draft You will take help of the equation of motion. making drafts Whose help will you take at this time? of the equation of motion Will take help. Now you have three or four of these Drafts will have to be made. displacement time also Have to make it. Velocity time also needs to be created, acceleration time will also need to be made and another You will also need to make a graph. Velocity and Displacement graphs will also need to be drawn. These four Are asked. Meaning displacement time also you Please make it and show me sir. Sir, please show me how to make velocity time also. Me. Sir please show me the acceleration time also. Me. And also plot velocity and displacement graphs. Show me sir. All these four will have to be made. Isn't it? One question is this and the uniform Acceleration is very much in your syllabus Because the equation of motion is uniform Let's work on acceleration. So kids, tell me one thing, if this If there is uniform acceleration then first mean understand. Acceleration is our constant. Say. Has good acceleration constant. it The matter is becoming clear. So first acceleration Attack him only. The thing that is constant But say attack. So the acceleration constant is So the acceleration is constant. So we have this I told you this graph is coming like this of acceleration time because acceleration is constant. Now if acceleration is constant then velocity It will continue to increase. but acceleration constant Because of the uniform velocity Will increase. So our velocity time graph looks like this Will come. The velocity-time graph looks like this Will go. As velocity increases, the rate increases uniformly. It is increasing now, isn't it? Now tell me about the time displacement. What will you say about it, then tell me speed The second equation clearly states that displacement displacement is proportional to the square of time is proportional to the square of time and Parabola always like this for square This graph of ours will come climbing up. Paragraph would have said Well now some kid velocity displacement Can create graphs. Its velocity How will the displacement graph be drawn? So for velocity displacement graph you will get A third equation of motion will have to be formulated. v² will be equal to 2as and v proportional under root S will happen. v2 you took in y So y proportional under roots becomes like this. What is this also, sir? This is also one of our It is a kind of parabola. Parabola four-way What are they? Tell me. Ok? Is it clear? So Draff Questions of this come in your exam and All of you should understand this matter well. Come on, come. Next Children, now we do some mathematical things. Let us understand this also. You will find two types of flowers. I will get it revised. One is to hit a ball Throwing a ball above velocity and Leave. Both formulas are important. Like if I say that you have hit a ball sir Where was it thrown with velocity u? Above Fanta. u Fanta above velocity. So from you I will ask two things here. at the highest point Arrival time And the height is to find out the height. The formula will be u2/2g and the time to reach the highest point Time will be u /g Suppose you have a ball in your hand. picked it up and threw it up with velocity u When my brother throws above velocity Height h will be equal to u² / 2g but time t will equal u / g as U let At 40 metres per second you have Fenta above 40 meters per second from height Put Li Direct UI / 2GT Time Not Put U/GT bus Let if you throw a ball from a height h I have left it. For example, suppose we have a There is a ball which you have thrown from a height h above the ground. I have left it. Leaving means initial Velocity Zero. It is released from a height h. Any Left from the hill, left from some bridge Gave. So he will ask you when the ball lands What will be its final velocity v if it comes at Will it happen? Isn't it? and the second to reach the ground If you release from a height h, then when If you people leave me, my brother will be the last one The formula to find velocity v will be as follows Route 2gh direct and land access The time formula will be under route 2h/g Although you guys can use both these formulas If these four formulas are stated then the speed You can certainly remove it from the equation, but I I am not afraid to focus on removing So I say you should remember this directly. 100 meters se chodo re final velocity under Set the value of root 2gh h to 100. Bus It's a simple thing. Ok? Let's move ahead. Let's move ahead. After this, children, the body remained in the lift. Burden. Remember its direct formula also Take it. Whenever any lift is stationary Is. Whenever any body is at rest If the lift is stationary then it The values ​​of R and mg will be equal to each other. R Our normal reaction is to look upwards Will happen. mg is the weight of the object which is below our towards. Ok? In this I will talk about R and Mg. Let me tell you a little about what R is called MGT. They say from. Children, this R, this R is told that it is in a lift. The object placed has apparent weight. and mg What happens? mg is the actual There is a load. R apparent weight mg real weight. children this which is r if the lift is stationary. Keep in mind r and mg become equal. i.e. virtual The weight and the actual weight will be equal. The elevator is moving up with velocity Ar. Coming down at constant velocity. The applied velocity must be constant. The elevator is moving upwards with a constant velocity or below constant velocity It is coming. However, the apparent weight and the real weight The weights are equal to each other. r will be equal to mg. Yes Meaning whether the lift is stationary or a lift Go up and down with constant velocity In both conditions, keep in mind that r is equal to mg. Happening but if any lift with acceleration going up with whom are you going up If it is going up with acceleration, pay attention whenever any elevator goes up Then it also goes up from acceleration to acceleration If r is equal to then the formula will be mg g The formula in brackets is 1 - a / g use And whatever our virtual weight is at that time The vapor will be reduced by weight. Whatever our Apparent weight is less than our vapor weight Will go. So if any lift acceleration a If r = 1 - a in mg /g when going up Isn't it? Pardon me. I made a little mistake here Gave. Plus is happening here. while going up Plus it is happening. Because when you go up in the elevator When you go, you seem heavy. And If it seems heavy then plus in the middle It will take. And when you come down, you're scared. That means you appear light. light seeming only when you feel that you You will fly away. And flying means your weight It is being halted. Halta means middle I will feel minus. So while coming down, in the middle getting minus r = mg in 1 - a/g if any You are standing in the lift due to lift acceleration is coming down along with it, then the apparent weight at that time is No, the symbol will change here too. r > mg and here r is mg will go okay brother Yes, I corrected it brother. Ok. Okay, listen to one more thing. all these Things are for acceleration. such as the value Imagine you're going uphill with acceleration. So you put a plus in the middle. But this is If the value of acceleration is given in deceleration Is. It is given in retardation. then a Places -3-5 will have to be taken. So automatic beach I will become minus. Keep this in mind. Is it okay brother? Let's go to the last heading or the one You talk about projectile motion. This also Let's understand. something in projectile motion Not there. In projectile motion you have to Three formulas have to be remembered. such as the value Look, we have created a ground. From here You hit an object with u v velocity Or u feta with velocity. with such velocity Feta with. u so projectile motion such Went. So the first thing you should know is that This u velocity will have two components. The horizontal component is what you call u cos theta You will say. vertical component that you guys uin You will say theta. u cos theta never remains throughout the motion It will change. i.e. throughout the projectile motion The horizontal component is always u cos theta Will remain. Always means forever will never change. Will never change. So one, this is direct The question arises that projectile motion Which component of velocity changes in Is? Which constant remains? So attention to put the projectile in motion which The horizontal component is u cos theta That will always be fixed and the vertical component Its uin theta changes. He gets very angry. One, these are you people and the other In this you will be asked three formulas. One So what should be our maximum height? Do you want this? Second, what should its range be? i.e How far is RERA going? and the third one You are asked what you call time off. Flight. Isn't it? So remember that whenever From you time of flight t equals formula Will be asked. So I want to tell you this formula. 2sinθ/g This is the time of flight that is asked for. or r is being asked equal to which You say range u squared sin 2 theta up g u² sin 2 theta up g whereas if you take the height h If you ask equal, then the height h will be equal to u squared sin² theta / 2g Memorize all three formulas in such a way that without You may remember it without any confusion. Time tuusinθ / g r = u² sin 2 theta / g h = u² sin² theta / 2g Ok. What happened brother? Look at you guys There should be energy inside. I repeatedly a I am saying this again. and a lot of children There is energy inside. I see that 800 750 children are watching continuously. into them There is energy. The rest who come in between Sometimes it reaches 850-900. If you don't come It remains 700 750 800. So I want this That you guys should share the session with everyone once Give it. Who hasn't liked it yet Please quickly like the session. So that the energy within me and within you May it remain. Isn't it? And the children who are new Connected, I repeat to you once again I want to make it clear that we said this It was that we had to revise so many chapters. Are going to get it done. Our basic The electricity is out. Our liver And the revision of Simple Machines is over And our revision of Dynamics is also over. are done. Ok? We need the power of words Energy units and measurements, revision of all these There is still work to be done. Is it okay brother? So now Our revision of three chapters is completely over. Used to be. Look at this, we are going to take this PDF. Pathshala Railway Exam on Telegram Channel I will put it. It has even happened. Now The next chapter coming up is Word Power. and Energy Arya Once everyone shares the session and All the new students to the channel Please subscribe as well. Correct. I think it took me about 3 years to teach. It's been around the hour. Now I have 15 minutes Please give me a break. 15 minutes so Give me a break so that I can eat something. Because I just drank water in between Was. I hadn't eaten anything yet and I was I live at home. So it is not the case that The teachers around me come and tell me These are not the ones who feed us laddus and vadus. With me. So I eat a little something I take it. After 15 minutes we were fine. It is about 6:57 right now. you assume Let it be 7:15 or 7:15 or 7:00 We will meet back around 7:15. Then we will be the world power and energy Will revise. I am not keeping an end to the class Am. The class will continue like this. Ok? Let us go We meet again after 15 minutes. No, we will run the class till 10-11 o'clock. Is Now one minute Thank you Of Hi You Yours And You Ok Five minutes is a little late. Quick All of you join me again. You guys must be hearing my burp. Isn't it Let's start, whatever we have The revision has been done and now we have Revision is tana, that is chapter, work power And energy is a lot of questions for us. Questions are also asked from the chapter. As such Not there. So children, the first thing that The heading that comes is tar. We are tarred Have to understand. What is tar? children To explain tar, I looked at the most What did you do first? a horizontal line Pulled. Suppose we have this horizontal I am placing a pind on it. These values Here, I have placed the body. And this is our body This is what we have kept a body for. Ok? Children, This is a body of mass m that we have It is placed on a horizontal plane. If I will pull this body by applying a force. One I pull with force and this force is What angle is it making with the horizontal? Theta is forming. So my brother, we are with this force People can do two components. This one which component will be that will be f cos Theta. And this component will be will be our fsin theta. If I tell you I ask you to tell me which of the two If a component is drawing this object You will clearly say that f cross theta is He is taking it forward brother, if this had not happened If it does not move forward, then w is equal to the force f cross theta and whatever our displacement comes is gonna be s w = f cross theta * s but if If I talk then here this cos theta is this cos theta put forward so fs cos theta theta fs cross theta this The formula for our string will be w = fs cos theta, tell me children, this wire is What kind of zodiac sign is this, then say wire, wire We have a kind of scalar quantity called string What kind of zodiac sign do we have, scalar now in this You guys remember three cases very well. Should be children if this is the value of theta If the value of theta is less than 90°, then at this time The wire will come and it will come in our plus if this The value of theta is 90°. Exactly 90° So t will always be zero. Always at 90° It is zero. note this down Everyone. And if this is the value of theta, which It comes more than 90° to you then Your t will be our negative. Ok? So w = fs cos theta it should be clear to you guys Needed Another one of our kids strings There is also a formula. Listen to that also. Many Once we have the wire, we use this wire with force and Also called the scalar product of displacement. That is, take the force, take the displacement and Remove the dot product of both. This is also a kind of wire for us. w = f.S f.S What is this also about us sir? This is also our There is a wire. In children's formulas, tar Main two things have come. Force and displacement came. So whenever you ask the SI unit of wire If asked, you will be given the SI unit of wire. Always mention joules. CGS of the wire to you If units are asked, you people will always I have to tell the arg. What to tell? Arg and Remember the relationship between joules and ergs of wire. It happens. What is one joule equal to, sir? 1 Joule is equal to 10 to the power 7r. 1 joule equals 10 to the power 7 so this is our wire SI and CGS units are being You should be clear about it. children Let me tell you the unit of work or Now going forward we will see many more units. Will read. This formula of work that I told you fs cos theta plus two functions and There are. Many times the force at work The applied f changes this. Isn't it? So the wire You should also remember this formula. When also the value of Ravi force changes then there But we are talking about average force and displacement. You can also extract the string by multiplying it together. Are. So you guys, let me give you an example. Am. As I said, the force value 0 to 0 5 Newton 10 Newton 15 Newton Is going. The displacement is 10 meters. So tell me tar. So here we have the average force will have to take. What will I have to take? Average Force will have to take. So average letter also we people You can remove the task. children many times Averages don't work. So we can do the work People also use another formula. Integration f * dx then integration f * dx We also use the tar formula. do. Children, the formula below Neither do you use the below formula in every case Can be used. Isn't it? This one The formula is this formula every Used for conditioning. any condition Yes, this formula is for every condition Can be used. every condition But the formula above in which you You can use it only if you have taken the average When the value of force is is proportional to a power of displacement. Or Then how is the force changing? our strength Change is happening in a uniform manner. Unif There is variation in force. One of our strengths Change is happening equally. Then you guys Average Force in Displacement Formula Will you apply it? Ok? You can make all this clear yes. I will also give an example So that you guys become clear. That is the question Put the doubt samosa red too. give the bulb should be given, displacement should be given and the reason should be asked Take. Late I am telling you that man Take one example where it happened that someone The force we are applying to the body is The forces that are being applied on the body are being applied 4 * x 4 * x is applying double and I am saying this I am saying that when x = 0 meters x equals 10 meters to tell you guys t That is how much should the TR tar work I have to tell you Okay kids, take a close look here. The value of the force is 4x. Force is our constant Not there. If force were our constant, here Only four would have been written. Four with x. So Force is not our constant. changing force Is. So the force is changing so we get the average force Will have to remove it. How to find average force Are? First, set the value of x to zero. children When the value of x is kept zero, then the force here The value that will come will be zero. The value of the first force is 10 and the value of x is 10. Keep the meter. If we keep it 10 meters then the second force If you keep the value 10, it will come to 40 Newton. Come Will go. Now take the average of 0 and 40. My brother, the average of zero and 40 will be Adding both of them gives half i.e. 20 Newtons Will go. So your question is solved with 20 Newtons. Is happening. Who is solving your question? 20 It is being solved by Newton. So the value of tar When you release it, the force will become 20 Newtons. Your displacement is 10 meters. So this question The correct answer would be 200 joules. ok brother So the formula above is the average formula. It should be applied only when the force is at power. But if eight is not in power, there is force of two Is the power coming or are the three powers of force coming? If it is there then you people have to do integration The same method has to be used. Its Apart from this, no other questions could be solved. Correct Is? Well, that's it, kids. Other than this A graphical representation is also helpful for you to understand. It's about the strength of the tar. For example, suppose I have a graph here. And I have drawn this graph of force properties. between displacements. Children, whenever force A graph is drawn between displacement and Is. So the difference between the force and displacement The area below the draft is Isn't it? between the force and displacement The area below the draft is What does the area give? So say this Area also gives tar. Many times you No formula is giving anything to the people I am not giving. I am just giving him the draft. Tell me this is the difference between force and displacement. It is being pulled. You tell me the wire. what you Tell? Tell me the task. I am also an example Look, let me tell you. like I I said, Sir, I made a draft and this The drag created between force and displacement Gave. Here on the y axis I took the force Took. I took the displacement on the x axis. I have made this draft like this. Force And created such a draft between the displacements And I am also telling you some values. As such It is not that it will not tell the value. I am saying that this one, the value, this one The value here is 20 Newtons. 20 Newtons And I am also telling you this value. This one Let's say the value is four and this one It is also telling the value, this value is six If it is there then he will ask you to give some more strength Plot a graph between displacement and its speed. So tell me what do you think while telling the telegram? You have to pay attention while telling the wire Do not do below force and displacement This entire area, at this one area at this area complete Add the area and give you the work will find out Okay, tell me how you are taking the target. If they were rectangles, what was the area of ​​the first triangle? Will be done? So let the area of ​​the triangle be 8/2 long base * perpendicular base 8/2 long base If you do it then 20 four 80 80 half 40 and when you If you find the area of ​​the rectangle, then six from here and the distance between four two and this 20 two and 20 This will also become your 40, friend Our total is 80 hours Is it clear brother? Ok? It is becoming clear, right? How we Did you solve the question? So this is the whole The story is about tar. remember this Do it. And nowadays in exams these ones Ask questions on formulas and this formula Used to be. Be careful in the question paper. These remained. Ok? Come on, come. Children after the wire The next chapter on head in idea Kinetic energy Everyone knows about the speed retired Joe The energy stored is called kinetic energy. Are. The formula for kinetic energy k is equal to is the kinetic energy equal to k which is given by the formula It happens, it happens 1/2 1/2 m * v² is our kinetic energy There is a formula. Let these formulas A much more important formula than It is emotional. When we put momentum p = mv If so, then the second formula for kinetic energy is also It gets put. k = p² / 2m so my brother You remember these two formulas of kinetic energy. Keep it. One then t = 1/2mv² And the second formula to keep in mind would be k = p² / 2m. Kids, this is a very good question. Tricky questions are created. children Let me tell you, suppose I asked you normally being that the kinetic energy of the mass How is it proportional? Isn't it? So children, I Let me tell you that kinetic energy is the sum of mass is also proportional to the kinetic energy is also inversely proportional to the mass Is. But kinetic energy is the product of mass When will there be proportionality? I will tell you when Sir Velocity constant will be taken. That is, above The formula being used and the kinetic Energy is inversely proportional to mass When will it happen? When your momentum is constant will be. So it is not necessary that every time the kinetic energy Energy should be proportional to mass. As That the question will tell that if any body If momentum is constant then kinetic energy is mass But how will it depend? The first answer is being is proportional to the mass. second descendant There are many such things which are proportional to mass and electricity. All the options will be there, so you should understand them. What is the answer there? Correct Is? The second most important thing is a couple of things The questions are asked very well. children these This is a very good question to ask. Example No. 01 If the momentum of a body should be increased by 10%. If the momentum of a body is increased by 10% What will be the effect on its kinetic energy? Will it have to? This question is asked a lot or The reverse is also asked. the opposite of this also are asked. On the contrary, suppose it is asked It is being said in example number 02 that if any If the kinetic energy of a body is The kinetic energy of a body is decreasing by 36%. If the kinetic energy is decreasing by 36% then tell that By what percentage will the momentum of the body decrease? Such questions will come. There are a little more percentage questions in this. Let's come. So don't memorize it. i you Let me explain things. Very neat and clean I will explain it in a way. First of all, children You understand this. The momentum here is first In the example above, it increased by 10%. Its This simply means that the momentum which was earlier 100 It was 110. You can also call it that So that the momentum which was earlier 10 becomes 11. Zero to zero to 10. good kinetic energy is proportional to the square of the momentum. So when If you take out the kinetic energy, then the momentum You will square 10 squared to 100 and The square of 11 is 121, so the kinetic energy Energy is changing from 100 to 121 and 121 in 100 Done. So this simply means 21% Ours increased. There is another formula for this which you can Now you call it formula, you can apply it with that also. This question cannot be answered with this That's why I didn't say ab because ab The formula applies wherever y is it proportional to x², right? Tell me the formula and the value of x is given to you and y When you are asked the value of this Your ab formula will work only if there is a sequence. and ab is the percentage of y in the formula The formula is a + b + ab/ 100 but this ab formula only and only at that time my Brother, you can apply when you have one The proportional value x² and the percentage value of x is y Whatever is asked, he can apply it and no one else. I don't, like this question, this one You can't put ab in look at kinetic energy It has decreased and the momentum is asking, the momentum is asking If you derive the momentum relation from there then The energy is proportional to the under root of the momentum energy. Used to be. Look at momentum from there kinetic energy is coming out proportional to the under root of. So You are not using the AB formula here. You will find it. Your brain will work here. What will work? Mind you kids, I have one thing for you. First of all, the kinetic energy here is 36%. Decreased. That is, the kinetic energy which was earlier 100 will now become Our 36 was reduced and it became 64. Now tell me your emotions What will be the two momentum? So momentum then under root is proportional to. Get it out of here. The under is proportional to the root. So under the root So 100 under root 10 of 64 is proportional The under route is eight. So our momentum is 10 to How much is it, sir? From 10 it became eight. So 10 To be eight means to subtract. How much decreased? then say Give it. In what did it happen? In 10. 1/5 came and When you make a percentage of 1/5, how much will it be? Will the percentage come? So the percentage of 1/5 is will decrease by 20%, which means your momentum will decrease by 20%. Under the second example. Is it okay brother? So don't think that you have I memorized the formula. This means that You are winning. ab formula everywhere Does not apply. Where would it apply Is? I have explained that to you here. Ok? Let's move ahead. Let's move on Are. After this comes the next theorem Which you call work energy theorem. Work Energy Theorem is very important. This simple thing just says work Energy theorem states that if work is done on an object If it is done then that TR tar kinetic energy brings about change. tar kinetic energy brings about change. Suppose this is a The object is of mass m. First its speed It was v1. You tarred it. to torque means you applied force to it. What did you plant? Applied force. So what will happen to it if force is applied? Will you go? Displacement will come. and displacement Its velocity is due to Velocity will increase from v1 to v2. So whatever our T is, that's kinetic energy. brings about change. So you TA tar w change in kinetic energy i.e. 1/2m can equal v2 - v1². Isn't it? So TA is the rate of conversion of kinetic energy to tar Make it equal. This is your work energy. There is a theorem. Yes, you can do this also. This wire which You can also open f*s instead of this. Wire You can also open f*s instead of. Ok? So And the energy theorem is simple. Tear tar to you Make it equal to the change in kinetic energy. Children, after this potential energy comes. Potential energy means that whatever Energy comes due to position, it is called potential energy. It is called energy. We are here to discuss the main topic We will calculate the gravitational potential energy. By the way So normally you guys know about gravitational The formula for potential energy is mg h. We're talking about polar position right now. Of energy. But about this H, I take care. This is what H is There is displacement in the vertical direction. I I repeat it again. There is no height. If you are missing height, you will always You will get the dhotas. h whatever happens is What happens in the vertical direction? Brother? Displacement occurs. polar potential In energy u = mgh. I will prove it to you Let me give you an example. For example, suppose that I told you that we have to something that was here before An object of mass m was below and it was lifted. Done here. in an inclined plane Done here. Ok? We picked it up Did it there. So I'm asking you this Tell me about polar potential energy What will be the formula? I called it x Gave. I called it y. Are? I said let it go. So this Leave it. then polar potential energy I have asked you for the formula. First I am asking you for the formula. Tell Ground potential energy mgx Secondly, I said you are crazy. Third, I said mg Let x + y be the fourth one and I told you mg The under root will be y² - x². Tell me which of these Your polar potential energy will create? So I have just made it absolutely clear to you. Dhruvvi has cleared it neatly Meaning of potential energy. Sound Please increase it a little. The voice has increased brother. Less I am not coming. Well, someone has increased it. Now you check it There is one time. So the potential energy I What did you tell? h what happens? vertical displacement in the direction. So when you get up here then the displacement in the vertical direction This value will be created. This you h Will you agree? Understood? So if this is h then the value of h turns Square minus base will become square. Because of which the correct answer to this question is That option number D will go. Ok? Is it becoming clear to all of us? Okay, so u equals mgh, this is our gravitational force. Potential energy is achieved. But potential energy There are many other types as well. As What is the potential energy of a spring? So children, first of all, accept our There is a spring near it. Every spring, whenever you guys You also hang a weight i.e. mg and If you hang and pull this mg Return to what is immediately after pulling The situation of coming arises. to oscillate like this Starts it. So suppose when you The weight was hung, so this weight is our x The distance came down. How much did it cost? H The distance came down. So you guys have a The term you are asked for is Bal Absolutely. So the force of any spring The constant is the product of the applied force and the return The ratio of the displacement to the force constant is They say. t equals f / x. Any The restoring force f in the spring and The applied displacement ratio T is equal to What is f b? So this is what I said to Joe. Spring solstice is approaching. what will be said This? Spring Constant. Sometimes we also call it force constant. Are. Whether you call it spring constant or Call it the force constant. Both of us are the same The thing is. K equals F / X. Children, The force constant K of the spring is Units are also asked many times. spring The unit of force constant K will become equal to Newton per meter. newton per meter The formula for the force constant of our spring Is. Balta children of spring this which t equals f / h I told you the formula this The formula is very important. Spring's Too much is asked for. whenever ever If you understand the test of spring Potential energy comes inside the spring. and the potential energy of the spring is u Its formula is 8/2 h², this is the first The formula is the potential energy of a spring Of. Let when the value of k is there you will put fx here So as soon as you put the value of k as 1 f/x then Keeping f/x at 8x will cancel out the 8x so 8/2 fx this is also our sprint based energy and the value of f when there is value of f or put the value of x put the value of x so If the value of x is how much f / k then one-third of the potential energy of the spring The formula will be 8/2 f2 12 / k so remember Keep this one in your memory. You do it, but this too, this too, all these things bloom It is important to us. Ok? So you have memorized 1/2 kx². But all three It is important. Ask questions about all three Is. Like I'm going to ask you a question, look. Listening carefully for a spring. One I am asking for an example. any spring For for a spring The value of the force By keeping constant Keeping the value of force constant, its The displacement is doubled. So What is the effect on potential energy? Will it have to? here comes the. displacement doubled Went. Now many people are thinking about displacement It has been doubled. So these ones From the formula, the potential energy should be four times Needed But there I said eight lines. Has given. Force is our constant. So when the force is our constant so you get this one You have to use the formula. Did you understand? As Power formulas are different in electricity. There are some things like that. So the force here If it is constant then this formula It is being used. Displacement doubled Has gone. So what is our potential energy? Will it happen? It will double. So double this question will be the correct answer. I will tell you where the class PDF is. I will get it, right? So, it's spring. Things you need to know about potential energy It should be clear children, after this In this chapter we will talk about power and strength. All that's left is to remember two definitions. You people are always confused, there must be one Work turn rate and turn rate ability children work turnity which ability It is called energy but work is called work. The rate of torrent is called power. Are. So if the tar ternity rate is written then The rate at which the tar turnity will be is called power. Will go. Now the formula for power will be simple Tar turnity rate means up tar down time. So we accept the rate of tar ternity. We will say Shakti and we will show Shakti. From whom sir? Power is shown by P. P Equal work up time. Meaning of work for children It became Joule and time meant second. Write down the joule per second and joule per second. By what name do we know it? Watt's name Know from. My brother, its unit is Watt has arrived but Vima is also very important It is his. If I ask for its dimensions, remember The dimension of power is ml2 t - 3 This is the dimension of our power. Vima saris yaad I will destroy you. Isn't it? children's power There are many formulas. Now I will tell you many I will tell you all the formulas. Your first formula for children's power So I told you what happens to me. If we divide this w by work as force * displacement Open it in. So as force * displacement If you open it, children, listen carefully. Displacement, whatever time it takes, displacement Will it be ours in time? Velocity. So Another formula for power is Force * Velocity. This is also Children. So many times we use the wire for energy You can also push it into positions. potential energy If you calculate it in terms of then the formula of wire mgh/t this will also become this wire and If you measure the wire in terms of kinetic energy So our next formula is kinetic energy of the wire. mv² 1/2 mv² / t You can also say this This will become the formula for power. all these Formulas are our favorites. So say this All these formulas are of our power. whether Please tell me about it sir. Whether Force * Velocity Please tell me sir. You can say mgh/t sir. Let's say 1/2 mv² / t. All of these All the formulas are based on our power. Is it okay brother? Tell me brother. The matter is becoming clear to everyone. So tar What is the rate of turn called? is called power Is. ALP I corrected that. when you Watch the video a little further, okay? Did it. Isn't it? What is the name of ALP? Himanshu, I have corrected it. You further See, it's done right. Correct? So from here Our chapter on Word Power Energy It ends. The next chapter Yes, that is a little more important. you a little Bring the energy. Children, this chapter has units and measurements. I will tell you again Let me tell you that this unit, this is very easy. You made me think the world Read this unit chapter from teachers across Must have kept it too. This is a very easy chapter. But This is the measurement chapter, which is the previous one. Questions were asked several times and this time too you Understand that two to three questions will come in measurement. I have to come. You will get an error reading in the measurement. It happens. There are a lot of things that It has to be read in measurement. Sarth Tunt There is, err, a lot of things. So a little bit To keep the enthusiasm alive, I should teach the unit. I will not teach. No, not a unit I will teach. I will teach the unit. From the LE unit First I want to teach you measurement. I am here to tell you about measurement. Let things become clear. How do we measure Have to understand. Ok? measurement because very It is important. Everyone knows this. Correct? So children, how should we understand measurement? I Let me tell you. First of all, I will tell you guys I want to explain a little bit about the error. What is that error? Isn't it? two minutes Understand what I am saying. We start with measurement Are doing. Before Understanding Measurement I want to explain the error to you. error What happens? error which you guys know Do you speak in Hindi? you call this Error in Hindi. What is this of ours? So This is called error in Hindi. Children, what is this error? i you Let me explain. Suppose we have one It is soft. And this one we have is soft, The diameter of this soft is the diameter Its 20 mm. I told you that you Please measure it with a vernier telemeter. Its true value is 20 mm. Its value is 20 mm. So 20 mm what it will be called it will be called true Value. True value means its actual value. There is value, there is true value, there is correct value. There is an extra 20 mm. You can read the Vernier tally on the Lay came and brought it on the vernier telly. His Measured value was found. of measured value That means you measured it. So my Brother, when you measured it, after measuring it Its value comes out to be 20.2 mm Listening True Value Its 20 mm. But When measured, it came out to be 20 mm 20.2 mm. So when my brother you ask me about its error So the simple meaning of error is that the Your measured value is also true. is the true value. Take the difference between the two. Say the difference or put a mode on it. Brother Mezzard The value could have been less than 20, 20 It could have come even more than this. So I here Applied the difference. So my brother if I make an error If I talk about this, the error will be measured. value minus true value so error is ours You guys always keep the 0.2 error in plus. Tell me because we have made a difference here. Is. Tell me this is becoming clear to everyone. Is it clearing? friend come in the dark No Complete Brother, there is a slight problem. Not a small problem, but a big one Is. There is no electricity for the last three to four hours. Has been. The inverter is working now. Ours and my madam came and were taking turns. There is no light. You keep on teaching. I said until the light is completely off. Till she leaves, I will teach you whatever is there. well I want to arrange for a generator as I move forward. If I had to, I would have picked up a generator from somewhere. I will bring it. I will teach Lev. At least we I will definitely teach the topic of measurement. Isn't it? So I told you what error means. Is? Sir error means measured value And the difference between the true values ​​is called People say error. This is clear to all of you It is happening. Now children, after the error, we have to We have to understand the types of errors. This is the main It is important. What are the types of errors Is? So children, if we look at the types of errors We will talk about it. Now a few things from here Understand. So understand this in types of errors. What is it? For example, suppose that such Suppose you were told that I have a It is soft. I have this soft one and I I asked you to measure its diameter, brother. What is its diameter? Come on brother, let's measure it. So I said its diameter when I If you measure its diameter, its diameter I used different measuring instruments x1 measured, then measured h2, then measured h3 and this Ours measured x4. All of this value This will be called our measured value. I get this I don't even know the respect. I had a clean one. I don't even know how much respect I have. But when I measured it with one telemeter So I got the values ​​x1, x2, x3, x4. 20.2, 20.1, 20.4, 20.5 so children these are x1, x2, x2 values ​​found. This measured value Is. And when you calculate their average value What will you get out of this? Average. Average mean in By adding up all of you Divide it by four. So this is our The average value will be found out, children, this is the average The value will be called our true value. This We will call this value true value. This is our true value. Now the question is that What is absolute error? So children Whenever you guys get an absolute error If you want to take it out, I will let you know for a while. What I told you earlier is that if you have absolute If you want to remove the error, set the measured value to true. Subtract the absolute error from the value It will come separately. Look in respect of x1 Delta x1 will be the absolute error whose Meaning, you will replace x1 with the average value Take the difference. Isn't it? if you The absolute error delta h2 is to be calculated. This means you are averaging H2. Take the difference with the value. if you To find out the Delta H3 absolute error What do you make of the average value with H3? Take it? Take the difference. And if you like H4 If you want to find out then you can calculate the average value with H4. Take the difference of. So these four terms Shouldn't we remove these four terms? They call it absolute error. So Absolute How did you remove the error? delta x1 equals x1 - Take the average or the difference. So you have Delta x1 Delta x2 Delta x3 Delta x4 Output Took. Now what is the mean absolute error? Is? Sir, mean absolute error is Whatever absolute error you have encountered Which you can call Delta X1 Delta Xh2 deltax3 delta xh4 you are saying All the absolute errors that have occurred You take the average of the absolute error, this is will be called your mean absolute error Which you people will show like this absolute error ok sir mean absolute The error came out and now the mean absolute error came out. So tell me children, what is relative error? Relative error whenever never being thrown. I am talking about relative error. Relatives error, right? sorry here The relative should not have become absolute. This is simply called relative error. What What is this called? This is called. This is called relative error. Only Relative error. Isn't it? Relative error. We can call relative error and relative error Also known as Aton. said this to is the fractional error. Meaning of Fraction There is a fractional error. Isn't it? So whether you call it relative error or not Call it fractional error. So what does this mean will be? So the children mean of relative error will be that whatever your mean absolute error is If it is there, keep it on top. And the average value that came out of this or the mean The value that came, you keep it down. this one Write down the average value, if you want it will be called Your relative error or fraction error. Look into relative error and fraction error. Both are ratios. Above we put delta x Below we put x average error. and percentage error whenever it needs to be made Percentage error This would mean that whatever you have relative The error is calculated relative to the same You take the average of the relative error from 100 If you multiply it then our percentage will be error will come Ok Please tell me more in Hindi, I will tell you Hindi. No problem also Absolute Error Hindi The ultimate error occurs What does this mean? it means The ultimate error. Isn't it? what does it mean Used to be? This means getting the mean. Pisces Mean mean. absolute mean Ultimate error. The error will be noted later. What is the meaning of relative error in Hindi? Used to be? Relative error. or it Fractional means fractional Error. And what would percentage mean? percentage Error. Ok? Is it clear? Well, this is done. Now these formulas are important children. Now we have to do error calculations is in addition, in subtraction, in product And these divisions. You have understood one thing Very well that what we are doing is Delta X We calculate the same Delta X, what about us? It happens? An error occurs. error and whatever aids we have is our There is a true value. What is the actual value? Give it. And when we have to find the percentage error If required, find out the percentage error The formula becomes delta x / x * 100 You people have learned this very well. Correct? Now kids, aren't they very good at physics? All such formulas are there in addition which occur in multiplication. As that we should say that we have two resistances R1 R2 is its series combination R1 + R2 It happens. It is asking for an error or Kinetic as last asked area You understood the formula well I am remembering. So children, first of all you Have to listen in addition and subtraction. Value So, we have a physics There is a formula in which whatever our result is And we call this result Let's call the result x. x result which is That's a + b. So tell me what is the error for this will be? Or perhaps we have one in the whole of physics. There is a formula whose result is x equal to a - b is. What will be the error for this? in the same way In the entire physics, we have no such The result is coming in which x is equal to a * b. Tell me what error is happening in this? a * b then I come a lot. As if the area is a rectangle. So the rectangle The area of ​​a circle is length * width and In these divisions, my brother is also in these divisions Let the result be x equal to a / b. So tell me what will be the formula for error in this Division also comes in many divisions such as Question on density equals mass by volume I came, are you understanding the matter, or something like that? There are also formulas which are complex. Are. As kinetic energy k = 1/2 mv² now I have formed an LP group. of the rolling pin in it In radius he gave the percentage, in height Gave percentage and percentage in volume It is being asked. So some complexes are full Will also come. So children, the simple meaning of error is delta x if we know delta x If you want to do it then for all these formulas delta x kaise karne error main delta x takay Have to do it. So if you want to remember our result Whether the result is in the plus formula Ours should be on the minus formula. Both Delta X will be equal to Delta A plus deltaB for this also deltaX delta A plus delta B and remember its For this also, it will be delta A plus delta B. You must have digested the point. You might have digested it but I can't digest this point. It might not have happened, you might be thinking that there is a minus in this It seems there is a plus in this too, not a minus. Because the error that is told to the children is How our errors are always reported If maximum is specified then maximum mm error In case of telling, whether the result is ours Whether it is plus B or A minus B, our result is A. be the value of delta H in both the conditions Delta A plus Delta B will be Tell me, is the matter becoming clear to everyone? method if our result is a * b or a + a / b is there, isn't it, in this case when you If you calculate delta x, then the result of calculating delta x is The formula would be delta x / x equals Delta A B Ls Delta B B Meaning this thing is also in our multiplier It will happen and the same thing will happen in our kiss. Yes sir, the same thing is there in our divide also. It will apply whether it is multiplied or divided. If you want to calculate delta in both the conditions then delta h is equal to delta a bl DeltaB uses the same formula will be. You should remember this well. Isn't it? There is no voice problem. actually I told you that the light here It is completely ending. The light is running out So the internet also starts fluctuating a little. Put. Isn't it? You were with me once before Remember it well. I am telling you again Am. You will wonder what Mar Sahib read. Have been. Mar sahib who is teaching a lot You are teaching correctly and teaching only what you need. It is in the syllabus. If I give you an example now, you will understand it yourself. I will come. Did I tell you? Whether a + b equals x or x = a - b error delta x equals delta a plus delta Be B. Whether a * b or a b is equal to deltax deltax/x equals delta a / a + deltaB / b Applying this formula to both Whether in multiples or equal divisions Many related formulas come to us like this which are formed in complexes. complex flowers like let's say I have already told you that kinetic energy k The equivalent formula is 1/2 mv². Is. Now you give me the formula for error in this. Show me. So children, whenever there is an error If the formula is made then first Remove the constant term altogether. So Children, when you removed the constant term Gave. Now here is the multiplier. Isn't it? So What is to be done? It has percentage error I am telling you the formula. although you Make it a percentage or a ratio if you want. You can also make one. Bhai Ratio Wala If you make it, it will become delta B. here We don't care about constants. in m If there is a power then it will be delta / m. in v There are two powers and whichever power is to come forward It is coming with plus, please bring it. whether it is below Whether it is above. So v² is then v to the two power r Bring it. Make it deltaV/v and in the middle It will remain a plus. Because we have maxima error Are taking it out. Now if you want to make a percentage then all three and both And we will multiply it by 100-100. When We will multiply both by 100 each. So this will become your percentage of K. The percentage will fly away. This is yours will become the percentage of M and this is yours Percentage of V will be created. So any If you want to create a complex formula Even complex formulas are very easy to make. goes. Whatever his power is, he should take it forward. Come and put what in the middle? Plus felt Give it. Bus What should I put in the middle? Put a plus. Bus Isn't it? Okay brother. Now I present to you some I am getting the example solved. Example Only if you solve it will you talk to people. You will understand it well. Just look. I will present some examples before you I am getting it solved. I also brought it in writing Am. The questions that came last time. Such as Suppose I asked you this question The last time it occurs, the value of R1 is given. 30 Plus minus 5% Listen carefully everyone R2 given the value of 60 plus minus 5% and the value of R3 is given by 50 plus minus 5% It has given three values. And this question should be asked It is being said that if these three resistances Are connected. If these three resistance series are connected in. How are you connected brother? In the series. How do these three resistances Are you connected? are connected in the category term. are connected in the category term. Category Term are connected in. So like they have R1, R2, The value of R3 is given. So in series term Are connected. So the value you need to specify is The value of net resistance is to be given and net You can also tell the value of resistance by R + - To be expressed in the form of Delta R. To be expressed in the form R + - delta R. So Children, first of all you must understand that this How are you connected? are connected in series. So are connected in series. So you tell me this Please write the formula for net resistance. What will he become? R1 + R2 + R3 in series If you join, it will be very easy till here. that if they are connected in series then whatever We will have a net resistance, which we can keep here. Here is our net resistance which will be formed Whose value is R then add 30 60 50 If you give 140 ohms then it will come very easily. Went So the first value that will be entered here She is turning 140 no doubt It became 140. How to Late Delta R Will you take it out? So for delta R you get understand that this is our entire series And I told you one thing in the series. Meaning, I told you one thing in Yogaphal. Where did the sum go in the sum? This is in the sum I had told you that if there is a Yoga, then it is for everyone. The errors are compounded. This was told. So you add up the errors of all of them. Now this You will make a mistake. Kids, when you do all this Will you add the error that you told Sir Mar Saheb Delta R will be equal to Delta R1 + Delta R2 + Delta R3 I said exactly That's absolutely right, but now here you are. There will be a slight error because this value He has given it in percentage. Percentage Value is added directly. But when you Find the value of the percentage brother, this is 5% of 30 5% and this 5% is 5% of 60, so you directly Add it up but the percentages are different, right? If you can't make it 15 by doing five by five 5% What will be 5% of 30? 8 5% means 8/ 20 then 5% value 30 to 5% value 1.5 will come here Tell me, here the value of 5% of 60 will be 3. 8/20 and here the value of 5% i.e. 8/20 Whoever comes will come two and a half We have already calculated the value of 5%, right? As much value as Say. So when we calculated this value 1.5 3 7 then 1.5 three and a half then 1.5 three and a half when you do this What is? This is your delta R1. What is? Delta R2 what is this? Delta R3 So when you add all of these together Look, this will become our 7 ohm. I have arrived So your correct answer will be 140 Plus minus will be 7 ohms. If you want to make a percentage, then make a percentage. Writing in the form of two brothers seven percent If it is there then write it as 140 in the percentage form. Similarly, tell me how much is 120 divided by 140? If it is percent then make it 7/140 or make it 100 This will come to 5%, you can check it and see. Brother, tell me, is the matter not clear to everyone? getting clear Please comment quickly and tell me, yes sir. We are ready, we are clear, 15% now, like a You will get the option with 15%, 5 + 5 + 5 15% 15% is not correct we have even done it before Made it and then made it a percentage, 2 minutes In Alright here, let's go to example number two, division. Let's take a question. of head mass The value written first is of mass The value that is written. Let's take another question area. Let's take the one. Assume the area The length of a rectangle is written as 4 + - 0.4 This is written and the width of the same rectangle is written It is written 2 + - 0.2 So it is being said that it is being said Please point out the error in the area. State delta a. Just tell me the error. Just tell me the error and nothing else. Don't tell me. So kids, I have two ways of doing this: one way will tell you. The first way is by error. To find out, use the formula given by you Do it. Which one? The area is equal to Length * Width. And I told you that When the length of two things is multiplied. What is the formula to calculate delta at that time? Is it possible? to calculate the delta at that time A formula will be created. Sir, yours What is happening? If there is multiplication then to find the delta What was the formula made of? Delta a / a equals delta l / l + deltaB /b This formula was explained in multiplication Was. We know Delta, right? Error in area I have to tell you. So delta let's say the area in the same way What will happen? Area will be length * Put width 4 * 2 = 8 here. Delta Delta is 0.4. What is the length? Four. DeltaB DeltaB is what the latter 2 would be called. 0.2 and the value of B is two Are you understanding the matter? If I remove this So I'm going to subtract one decimal from one decimal. here 0 Decimal here 0 4 / 40 1 /10 2 / 20 1 /10 8 1 /10 1 /10 2/10 then the value of delta From here the multiplication of eight will be 2/10 If it happens in 2/10 and then it happens in 2/10 The value of delta will become 1.6 If the meter is square then enter the meter square. If it's in meters, then meters Square So this is one way, tell me one way. This is Delta, but another way. It is also easy. It's even easier than this. more than this I will also tell you what is easy. Even easier is that you divide them by percentage. Make it. What percent of 4 children is 4? So say 4/4 * 100% You tell me the same way What percent is it of two? This is also 10%. Is Or not? And the formula for area is Length * Width. When the percentage one If you make a formula then percentage of a will come out What will be the percentage of a that will come out? Will you come? So percentage of a is percentage of length plus the percentage of width i.e. 10 percent plus 20 percent of 10 so in the area which The percentage error will be 20%. The percentage error is 20%. This thing all comes to mind It is falling. So tell me about the area. What is the formula, sir? area formula is length * width. So when you calculate length * width you get area If you subtract then 4 * 2 = 8 So when you write this out completely, the area First its area will be written as eight. Then its Percentage value will be written. error percentage 20% in Now you subtract 20%, what is 20% of eight? If it happens then remove it. 20% of 8 has to be taken out. 8/5 If you want to find out how much 8/5 will be of 8 8/5 1.6 So look at the value of delta a is 1.6 has come When 1.6 comes then you guys can try this method also. Remember this gives quick answers. Many times people It often gives quick answers. Delta Out of this, this value is The value is delta. This value is the value a. That's why a is + - delta. Ok? Ok? Please comment once quickly Two. Did everyone understand the matter or not? Please tell us immediately by commenting. And if he is asking for direct percentage then more It's a good thing. Isn't it? Now I give you a I will give a third example also. Children Third I will give you an example of division. as if to say Used to be. Look at what the question is saying and this The question has also come up. The question is saying that If the value of mass is 6 plus Minus 0.3 going forward. This is happening rapidly and the value of density Meaning the value of volume is The value is two plus minus Yes two plus minus 0.2 This is the meter tube. So I am talking to you Write down the density of the particle. How is the density Will you write? Meaning to tell its density and that too with error. This will also mean density and There will also be errors in density. This is how to write it To you. Ok? So the density was easily determined. Because density is equal to mass b Volume. density equals mass times volume If we divide mass by volume then mass will be If the volume is given then mass b volume is 6/2 So three will come. Plus Minus Delta Rho If you want to write it then how do you write it? You will see how wonderful it will be I'll tell you the exact percentage quickly. Find out what percent 3 is of 6, so 3/6 * 100 so this is our 5%, you can check it if you want And what percent is 2? 2/2 * 100 Yours is 10% There is no formula for density, my brother. mass by volume when you find the percentage in it If you make a formula with error then the density Percentage Percentage of Equal Mass Volume will go up, not down in power If you want to apply plus then percentage off Volume So add the percentage of both 5 and 10 to get the rate. So the percentage will come to 15% That means whatever error we are making is 15% I will come in Now if you want to make percentage then this should be the answer Will go. If you don't want to make it in percentage then three Subtract 15% of it. 15% of three will become 3 * 15 / 100 is 15 3 45 and 45 / 100 0.45 Ok? Leave him alone. Gross formulas Leave it. Do you understand brother? Ok. Let's look at another question. similar I will give you a complicated question. The children were asking this question there. were saying The length of a wire is written as 25 plus minus 0.1 and TC is the radius of the wire It is written 2 plus minus 0.01 Given the length of any wire given the radius and asking you to Its volume will be Just asking that. error in volume Tell me, that is, tell me delta V. error in volume He is asking. Just asking that. volume error in And he is also asking you for errors in the answer. In percentage. He is asking in percentage. That's the question. The children were asking in their group. Ok? Asking for percentage error in volume Is. How did you like it? First make a percentage of everyone Take it. 251 then 1 25 * 100 So So it will come to 4% How much will this cost? 4% will come. Come and see Take one /2 * 100 will multiply by 100 So this will come to about 100 8/2 i.e. 8/25% Okay, I didn't make a mistake, did I? Please check it once 1 B 100 10 B Sorry, I made a mistake above Matthi is so worried this time Maybe I made a mistake above. Here But I should have come here Which is 4%. Correct? Now it's okay, right? Now let's find the volume of the cylinder Is. So the formula for the first volume of the cylinder is Tell me. So the formula for volume becomes πr²h Is. So pie doesn't matter to us because Pi is our constant. this is it Will go. Now you tell me yourself what the percentage is. How quickly can we fix the error? So If you have percentage error in volume I want to tell you sir So Radius Percentage of r and height raised to the power of 8 is Say percentage of h or say r length That doesn't make any sense. So the percentage of r Error is 5. Height or length is 4. as soon as If you add the total value, you will get an error of 1.4%. Will go. Isn't it? This is the question. Currently in the group Was roaming around. I saw a lot of children Two or four people gave good answers. Many people don't know about him I was thinking how to fight Tell me brother, are you ready to clear it? Yes, the light hasn't come on yet. The light is fine ok hey man Done Hey, you must remember the formula, right brother? If you don't remember these small flowers, you will remember them. How will things work? Hey, pi pi is in multiples so I I told you that Pi is our constant, so Pi is Leave it. We don't care about constants It is not there at all. has nothing to do with of Constant. This is what I've been talking about for so long I am explaining. Any taking of constants Don't have to give. And brother, please forgive me a little. Because I have to close the class. Will have to. The inverter has spoken from there. There is no electricity for the last three-four hours. I'm constantly teaching in the summer. My Don't worry. As far as your topic is concerned Already happened. Then tomorrow I will have some time You will finish this class completely by taking it out. Give. Although I brought everything It was today. Isn't it? I came with all these questions. Mass Weight density brought everything in full. Yes It's about heat and temperature. Drafter The representation is done. Then all these things I had brought it. LA also brought IT literacy I had brought everything, so now I also bought the computer. When I came, I taught you as much as I could. Revise it, if the lights come on then it will be night. I will be back live today at 10:00 AM. If there is no electricity at night then I will be back tomorrow morning Whatever it is, I will come live by tomorrow evening I will tell you by commenting, yes in PDF I am uploading this much, okay, morning also can take it at 5:00 or 6:00 because I know you will see me later son. Otherwise I will take it live, no problem. No Ok, I can go live tomorrow morning at 5:00 AM. So you be ready, I will be live at 5:00 pm also. I can take it, if the light comes then the light should come now If I go, I will be back again live. Part 2:30 Okay then, thank you very much, thank you. Very Much