SchoolAt5 - 2026 Preps ELECTRICITY EXAM QUESTIONS || PHYSICS

追加: 2026-06-03

[00:00:00]Greetings.

[00:00:02]I welcome you all to this particular session.

[00:00:06]This is our school at five.

[00:00:09]The lessons that we get to do every day 05 on Facebook.

[00:00:16]Different subjects. So today we know Tuesday is for physics. So every Tuesday we get to revise through physics.

[00:00:27]And these interesting questions that I'm having on the board.

[00:00:32]I guess you are able to see and you've joined. And I would just love you to turn your phone.

[00:00:40]Make sure your phone is in landscape.

[00:00:43]Where you are able to see clearly everything that is here.

[00:00:49]So these are the questions that we are going to answer together.

[00:00:54]We are going to dive into these particular questions. We see how to go about them and how to attempt that exam question.

[00:01:06]Even as you wait for other people to tune in. As you wait for other people to join. So these interesting questions.

[00:01:16]They are good good questions for your practice. Those of you under my online teachings, you are going to agree with me that these are the questions that I gave you. So I just want to revise through them so that you are able to see. Just to take you back. On this one.

[00:01:38]First question was telling you to say how can the object be charged? So when you bring that particular object against the a rope, you are going to discover that that the metal will be attracted. Its electrons will be attracted to a load, making it to be able to even attract other materials. You know that when two different surfaces are rubbed against each other, they become charged. So, once they become charged, they are able to attract other materials. So, like two different If you get a pen, you rub it against your hair like that, you discover that it will be able to pick to my small small small particles or small papers. Is it something that we uh did uh I think when we were doing our primary. We were able to do When I When I get a pen like this, I rub it against my hair like this, I'm able to get to my papers like that. So, that is a theory that gets to exist there. That is what you need to get and understand. So, I believe you are able to study, you are able to understand everything that is here.

[00:03:04]So, this is the whole uh physics, and uh you just have to make sure that you are able to know this, and uh we are able to get it. So, I'm going to revise with you these questions so that we know how to go about them and how to answer such questions. And don't forget that I do offer uh tuitions, and these, like I've told you, I gave these questions to my students. So, there are certain lessons that we get to do that are not posted like this one. They are just meant for people under my teachings. So, if you are such a one, you maybe want to join us.

[00:03:50]I want to communicate that the number that you get to use is plus 260971066747.

[00:04:04]That's the number that I use plus 26 0971066747.

[00:04:15]So that's my number. You can get that number, text me. You needs to pay.

[00:04:22]These are tuitions. We are a school for online teachings. Let us now dive into the questions. I guess a good number has joined and don't forget to like the video. Don't forget to even share it.

[00:04:40]An electrostatic generator sets up a current of 20 milliamps in a circuit.

[00:04:51]Calculate the first question. We are told to calculate the charge flowing through the circuit in 15 seconds. So they want us to calculate what we are calling charge.

[00:05:06]For us to calculate charge, there are certain things that you needs to know or there are certain things that you needs to understand.

[00:05:15]Charge, first of all, is given by the formula Q which is current times time.

[00:05:23]This is the formula. So charge is equal to What is the current? We are given this one that is here. This is called what? 20 milli amps. So how do we convert this now to amps to just gets to have amps? You needs to divide. You get the same 20 divided by milli-amps, meaning by what?

[00:05:54]A thousand.

[00:05:56]What answer are you going to get? What is the answer there? So, when we get our calculators, what are we having? So, when we get our calculators, so we get you get your calculator, you divide. You get your calculator, you divide there. What are we having? 20 divide what? 1,000.

[00:06:19]What is the answer there? We are going to get 0.02.

[00:06:26]So, we say amps. This is now the current that is going to be used. I guess everyone is following. So, you need to make sure that you are following. So, I've calculated the current.

[00:06:42]Uh I mean, the what?

[00:06:43]Yeah, the current that I'm looking for.

[00:06:47]This one I'm able to work with it. So, meaning that I know using this formula, current I know, which is 0.02 multiplied by now the time. What is the time? The time is here and it is already in seconds. So, I say I multiply it by what? By 15. So, finally, charge is equal to What is the answer there? The people that are working with me, what answer we having there? What is the answer? So, when you multiply, what answer you getting? 0.02 * 15. What answer you getting there?

[00:07:28]What is your answer? What is your answer? Somebody to tell me the answer so that I know that for sure people are following. What is the answer there?

[00:07:39]When you just Let's 0.02 * 15. What answer are you getting? What is your answer? Please, let's be quick. Let's be quick. Let's be quick. I want people to be calculating. Uh 0.3 0.3 Okay, so let me just confirm also.

[00:08:00]Let me just confirm. So, this is uh this is 0.02 uh multiplied by 15. So, I multiplied by 15. I'm getting what? I'm getting 0.3.

[00:08:15]So, meaning that is the what? That is the answer. So, I'm getting 0.3. So, I will just say 0.3.

[00:08:25]Then I say what? I say coulombs because I was looking for what?

[00:08:32]I was looking for charge. So, that is uh what I need to do. And uh those are just some of the things that I'm supposed to do. So, that is it. And that is how we need to answer such a question. We know now the charge that is uh uh uh flowing through the circuit in 15 seconds. That is 0.3 coulombs. That's all good. We are done with that one. We go to this one.

[00:09:03]The potential difference across a 10 kilo Have you seen ohms? Resistor in the circuit.

[00:09:14]The way this question came, they were just testing us if we are able to know these words. This is kiloohms.

[00:09:23]What does it mean when I say kiloohms?

[00:09:27]So, kiloohms when you say kilo, that is a thousand. Have you seen? That is the what? That is a thousand. The reason why here we have to divide. This was a milli-amps. That is what That is 10 to the power -3.

[00:09:48]Have you seen? So, we change it to what?

[00:09:51]1 over 1,000. It is just one and the same. Or we say 1 to the power now 3.

[00:09:58]So, that's why we have to divide. But, this one that is here, kilo, it is a thousand. What we need to do, we need to multiply 10 * 1,000. By the end of the day, we are going to have what we just get to call 10,000 what? 10,000 amps.

[00:10:24]I guess we are moving together, isn't it? You are able to understand everything that I'm teaching here. You are able to know this. So, this is what you need to get. So, the potential difference across a 10 kiloohms resistor in the circuit, we've converted this one and we've established an understanding to say that kilo that is a 10,000. So, here we don't need to divide, we multiply because kilo that is 10 to the power 3. But, this one that was there, it is 10 to the power -3. This is the reason why we have to divide because it was having a negative. This one it is a positive, so you just multiply it direct like that. I guess no one is having confusions here. You can SAY, "AH, SIR, HOW COME? Here you have to divide. How come here we are multiplying?" I've explained the reason why. This is 10 to the power -3. Kilo is 10 to the power positive 3. So, no one should say, "Sir, now, how how come there we divided and here we are multiplying? Now, you are complicating the physics." No, I've explained what these prefix mean. And this is how you have to understand them.

[00:11:45]So, potential difference that they are talking about, it is just the same as voltage. Voltage is equal to current times resistance. Where we say, "What is the current?" We've already calculated the current, 0.02 multiplied by resistance. What is the resistance? 10,000. So, multiplied by what? 10,000. What is the answer? What answer are you getting? So, 0.02 * 10,000. Let us calculate this together. What answer are we getting?

[00:12:23]What is the answer? So, those of you that are not able to see, I've already communicated to say that turn your phone to be in landscape so that you are able to see everything that I'm doing here.

[00:12:37]Your phone should be in landscape, like that. Because if you're watching it like this, if you're watching it like this, you are going to discover that the words will be too small to for some people. So, the best that you can do is to do what? To turn it to be in what? Landscape. If you are not able to see, but if you are seeing well and good. So, what is the answer here? I want to see answer. I've seen some people have uh commented, which is well and good. I want everyone to be participating. Everyone needs to uh participate. So, what is 0.02 * 10,000? What answer are you getting?

[00:13:20]You uh calculate You need to use your calculator. This is a live session. The good part is that I made this class also to be visible also to my students. So, everyone who is my student needs to be attending to school at 5:00 without fail. If you get to have night shifts and the like, I drop a link.

[00:13:43]I download this, upload it on YouTube, and drop a link in the group so that you try to catch up. So, this is it.

[00:13:51]All right. So, what is the answer here?

[00:13:54]Only two people have commented. Okay.

[00:13:57]Anyone who Many people are watching here. Several is saying 200 200. So, I won't confirm this one. I'll just go with your answer. So, we've said 200.

[00:14:08]So, the answer is 200 votes. That is the answer that is here. So, 200 what? 200 votes. So, that is it. And that is what we need to get. That is something that we need to understand.

[00:14:26]I don't know if we were able to see this particular question.

[00:14:30]State the law of attraction and repulsion between electrostatic charges.

[00:14:39]So, when we are talking about attraction and repulsion, you just have to understand that like charges are going to repel. Unlike charges are going to attract. So, this is the answer that needs to be here. State the law of attraction and repulsion between electrostatic charges. So, you just say that the law states that like charges are going to repel while unlike charges are going to attract. So, this is it.

[00:15:20]This is how you are supposed to do it.

[00:15:23]and this is how you needs to answer it.

[00:15:25]Just like this, we are done with this first part and I guess you've seen how I've attempted such a question. You've seen how I've answered it. This is how it must be answered and this is what you are supposed to do. I guess we're moving together. You are able to follow me clearly. So this is it. I don't want you people to be making mistakes. So this is it. We now go to this question that is here. We dive now to the next question that is here. So this is it. We are told how many cells are in the battery. So how many cells are in this particular battery? I guess this question is so simple. So how many cells are in this battery? If we are able to see, we are given this battery. How many cells are there?

[00:16:22]I don't know if we are able to see. How many cells are there? How many cells are there? Who can answer that question? How many cells are in that particular battery? If you're able to see this. So I think you've shared this video in two or four groups. If these people watching can share in one, you get by, you share, you share because this is public and we needs to make sure that we've got an audience that is watching.

[00:16:53]It feels good when you've got your doing such programs and when people are connected. Next time, we needs to a lot that are connected and this can only be possible if we are sharing. If we are sharing in our groups like that.

[00:17:13]So what How many cells are there? Somebody has said four, somebody seven, another one four. So, how many cells are here?

[00:17:23]How do we count cells? We know that the way we get to count, let me use a different ink here. The way we get to count, we know that one two, this is one This is two This is three This is four. Because we need to have a positive negative, positive negative, positive negative. That's how we need to have them. So, how many cells? The answer is four cells.

[00:17:56]This is the answer that needs to be there. So, the answer is four what? Four cells. This is the answer. You are done.

[00:18:04]I don't know if there is any with a question there. So, how many cells?

[00:18:09]Four. So, we just say the cells are how many? Four. We just say four cells. So, that is it. That is how you are supposed to answer that particular question. I guess you are able to follow through.

[00:18:26]>> [clears throat] >> We now go to the next question.

[00:18:30]Calculate the resistance of resistor two.

[00:18:34]As you can see, here there is nothing here. They want us to calculate the resistance of that one. So, how then do we calculate the resistance of that? So, what I'm going to do This is what I'm going to do. So, let me rub this part so that we are able to see. So, let me rub this part that is here. Let me rub this part that is here like this. So, they want us to calculate the what?

[00:19:07]So, let me rub this part that is here so that I use this same space to answer those particular questions. All right, like this.

[00:19:19]Let me use this space to answer that question here.

[00:19:25]Like this. So, I want you people to follow me clearly and attentively.

[00:19:30]Calculate the resistance. So, first of all, we understand to say that these resistors are connected in what? Series.

[00:19:43]How do we find the resistance if we've got the resistors connected in series?

[00:19:50]We just have to add. So, it is just a matter of what? Adding. So, we are going to add. We say total resistance is equal to So, this is what we are doing. We are on part B. So, I say total resistance is equal to what? Total resistance is equal to resistor one plus resistor two plus resistor what? Three. So, that is it. That is what I need to get. This is what I I I need to do.

[00:20:25]From here now, I say total resistance is equal to resistor one, that is one ohm.

[00:20:35]Plus resistor two, the one that I'm looking for. Plus resistor three, which is two ohms.

[00:20:42]So, total resistance is equal to one plus two that is there, you get to have three ohms plus what? Total resistance.

[00:20:54]This is the answer that you are going to get, isn't it? This is what you are going to have. So, this is what we are going to have. We want to find this one, resistor two.

[00:21:07]The next question that we need to ask ourselves, we need to say that okay, do I have the total resistance for this whole circuit?

[00:21:18]The answer is you don't have, but you can calculate.

[00:21:23]Resistance is given by the formula voltage over current. So, for us to find the total resistance in this particular circuit, this is a formula that we need to use.

[00:21:39]So, total resistance is equal to what is the voltage? Voltmeter reading eight.

[00:21:45]So, that is eight volts over what is the current? We are even given there, too.

[00:21:52]So, total resistance is given by the formula four ohms. This is the total resistance.

[00:22:00]So, that is the total resistance in this particular circuit. The whole circuit, so here total resistance is four. So, I can put four there. Four ohms is equal to three ohms plus two uh resistor two.

[00:22:20]We group the like terms. This three goes this side. So, we are going to have four ohms minus three ohms, which is equal to resistor two.

[00:22:32]Whereby therefore, resistor two is equal to what? Resistor two is equal to what?

[00:22:38]4 minus 3, that is 1. So, it is just 1 ohm.

[00:22:43]So, this is the answer.

[00:22:46]So, meaning that resistor two, this resistor two that is here, this is also 1 ohm. So, that if we add them, we get this four that is there, because that is the total now, total resistance in the circuit. So, this is how you need to answer it. I guess everything is visible. I'm able to see from here. So, I guess everything is visible and we are able to answer questions. This is how you are supposed to do it. This is how you need to answer it.

[00:23:25]The question is saying, "If the cells in the battery are of equal voltage. So, if the cells in the battery are of what? Equal voltage.

[00:23:38]Calculate the voltage of one cell." You are having how many cells? Four. And the total here is eight. Have you seen? Then they want you to find the voltage of each cell. You just divide eight divide by four. You get two. Have you seen? So, here you just say what? Eight divide four. You are going to get two. So, it is two volts. The answer there is just two volts.

[00:24:10]You've got four cells and the total there is eight volts. So, the four cells are sharing eight volts. So, each cell now is having two. Two two two two. When once you add, you are going to find the eight volts which is shown on the voltmeter there.

[00:24:33]So, that is it. That is what you just have to do. And this is how you need to be answering such questions in an exam.

[00:24:44]Just like this. So, no need of worrying.

[00:24:47]This is how things are supposed to be and this is how you need to answer.

[00:24:55]So, let us now go to the last question now. This is the last question in this session. I guess you've learned something and we will revise through one or two things.

[00:25:08]If the resistor three, are we seeing three, is removed. So, if the resistor three is removed, so if this resistor is removed, but we remove it, are we seeing? So, is removed.

[00:25:24]And the circuit with the remaining resistor resistors, we've got one and two, we've remained with one and two. What will be the reading of the what? Ammeter. What will be the reading of the ammeter? So, first of all, we know that the reading of the ammeter, they want us to find current. Current is given by the formula what? Current is equal to what? Voltage over resistance.

[00:25:55]This is the formula. So, the first question that I'm going to ask you, I'm going to ask you that do we have the voltage? Is the voltage being damped?

[00:26:06]No. The voltage remains what? Eight.

[00:26:10]Like this, eight volts. Over. Then, what is now the resistance? We need to find now for resistance since one resistor has been removed. We've remained with this one and that one. So, we find the total resistance. We've remained with the resistor one plus resistor two. So, since we are just adding one plus one, it is two ohms.

[00:26:37]These are connected in series. So, if they are connected in series, there is no much work here to even be worrying, ah, how am I supposed to answer this?

[00:26:49]How should I go about this? No. You should not even worry about We are just adding. So, we we've remained with a two. So, that is two ohms. So, meaning that the final answer here What is our final answer? Our final answer in this case when we divide, what is the answer?

[00:27:09]What is the answer here? What answer are we getting?

[00:27:13]This is simple.

[00:27:15]four ohms This is the answer. Have you seen? This is where we end from.

[00:27:23]So, for those of you that are interested to start your tuitions with me, this is the number you need to get. So, this is my number. You need to get this number.

[00:27:38]I'm going to help you. So, this is where we end from.

[00:27:43]I don't understand question C.

[00:27:46]Uh question three has passed. So, I even communicated to say that if you're having a question, uh you need to uh Uh you need to you need But, question three is is is This is one of the simplest question.

[00:28:03]If you are four of you, then I've given you eight quarter. How can you share it?

[00:28:08]How many is going to each person?

[00:28:11]Have you seen? There are four cells here and there's eight votes. So, each cell is having how many? You are four of you.

[00:28:19]I've given you eight quarter. Then I tell you to share. So, each person is going to have What will be the share to each person? A two quarter. So, this is what is happening here.

[00:28:31]Four people sharing eight quarter. So, each person is going to have a two quarter.

[00:28:38]I I I guess uh that is it.

[00:28:41]So, uh what if they have given a question to find uh voltage voltmeter? What do you mean?

[00:28:48]They can't tell you to find voltage.

[00:28:50]Voltage is already given there.

[00:28:52]So, they can't tell you to find voltage.

[00:28:54]If they tell you to find voltage, a question will be different. So, we should do not be thinking in those lines. So, if you are given to find voltage, most of you will say, "Let me hide the voltage there, then try to answer a question." No. If a question is you are told to find voltage, a question will come differently. In another way now that will also be like this, and this is how you'll be answering. That's how it is. So, don't say this is the reason why some people gets to say, "Ah, I think I've not understood this particular topic."

[00:29:30]Because you are trying to bring in questions that don't exist. So, if here, the way this these things are very sensitive.

[00:29:39]So, once they ask a question, that question should be proved and verified.

[00:29:45]So, this is how we need to get.

[00:29:49]So, let us just make sure. So, I've answered all the questions, isn't it?

[00:29:54]I've answered all the questions. All the And my mother was saying I didn't understand question C. I've even explained it here.

[00:30:03]You are four of you. I've given you eight quarter. How are you supposed to share it? Two quarter, two quarter, two quarter each. This is what I did.

[00:30:12]Four cells, total voltage is eight. So, how are they supposed to share it? Two, two, two, two, two, like that. That's what you are supposed to get. This is what you need to understand. So, uh this is what we need to get. This is what we need to understand. So, the when we are talking about tuitions, this is the number that you need to get. I guess the number is visible here. This number is visible.

[00:30:48]This is a plus 260971.

[00:30:52]Uh 06 6747.

[00:30:57]So, that is it and that is what we need to get and understand. We just have to make sure that we know it. Someone is saying, "What is potential difference?" Potential difference is as defined as the uh is the difference in electrical potential energy per unit charge between two points in a circuit. So, that is potential difference. I guess I've answered that question. Anyone with another question? If you've got a question, you're free to ask. You are free to ask. Okay.

[00:31:33]Okay. Another question. I think I've answered all the questions that are here, isn't it?

[00:31:37]I've answered all the questions that are here.

[00:31:40]Okay. No one is having a question. So, this is where we are going to end from.

[00:31:46]Thank you so much for connecting and staying up to this time.

[00:31:53]If you are looking for tuitions, this is my number. This is squad five and I think this has been a great session of which we've learned one or two things.

[00:32:04]We are able to pick one or two things from here. So, uh this is it.

[00:32:13]This is it. This is it. This is it. So, I don't know if I had the the electric key. Trip. So, I don't know if the person that asked the potential difference, but anyway, potential difference is just a difference in the electric potential energy per unit charge between two points in a circuit. The electric is doing this. So, I don't I don't know if we everyone has gotten everything he So, I'm just noticing I'm watching like this, then I'm like this, then pa. So, but I guess we've uh Network network has just become so bad so bad.

[00:33:02]But, I guess the days of this are okay.

[00:33:07]Cuz he I've just tried to take through here.

[00:33:12]Then, everything is just okay. Anyway, so these are the questions.

[00:33:17]Thank you so much. Have a wonderful day.

[00:33:20]Don't forget to share, like, and comment.