 Searching for it, I actually came across this circular diagram. When I learned it in school, I never learned it in this way. How many of you learned it in this way? You, I see younger hands. I never learned it this way. Roland, did you learn it this way? Yeah, two triangles, right, usually. But when I kind of searched for Ohm's Law, they basically combined power, voltage, resistance, and current, and of course, the iteration of all of that. It wasn't easy to remember the diagram. Yeah, yeah, so basically, in a way, you can say that power, voltage, current, and resistance are kind of interrelated. And if you want to find one, you can find the other. If you're looking for power rating in your sockets or something like that, these kind of equations will be useful. But once again, this is Ohm's Law for DC circuits. The next one is of course, Kochoff's Law that some of you also pointed out. So this kind of ties in with the vintage, right? Because Ohm and Kochoff are scientists by themselves. Which year were they? I think Kochoff was like 1847 or something like that. Ohm's like, kind of, remember. So Kochoff's Law, what are they? They are two laws. So one is the current law. Who can say what's the current law? So in the two, I know this equals the current that's going out. Yeah, all the current in is all the current out. And what about voltage? Voltage is kind of similar, but it is like the voltage drop should equal to the voltage gain. Or rather, in this case, the battery is equal to the three voltage loads, the loads here. So that's kind of, that's a good question. I would say sometimes you have to take in the internal resistance of the battery. That's what you learn, right? No, it still applies. That's true. There's a really important category of circuit where that doesn't apply. All right. What would that be? Anything in the present space. Oh, so that's AC. Changing magnetic field? Yeah, more externally induced. Right. Transformers, so like transformers, for example. Yes, actually, yeah. Transformers, so that's still AC, right? That's AC. Usually in ACs. Yeah, yeah, yeah. But it's not just AC, it's about the induced current. Induced current, that's right. The next one very quickly will be resistors in parallel and series, which are same as the inductors. Like the equation is the same as inductors, inductors measured in Henry, of course. What is parallel and what is series? Oh, okay, that's a good question. So this is, this is in series. That's a good question, great question, all right? So back to basics, right? So this is in series, like you're one after another. Parallel will be, if you have a wire here, that will be in parallel. So of course, for resistance, it is lower and for inductance as well. But for capacitance, it is just the opposite. In series, it is the inverse, summation of inverse and in parallel, you kind of sum them up. All right, and finally, I will point out, ohm's law for AC, I think Roland kind of mentioned it, but it's a whole different ball game. So if I kind of zoom it, I have the link to the website here, of course. But it's a whole different ball game because where do you go? Like I is not just, like in parallel circuit, you have to do like summation and there is also imaginary numbers coming into play. I think I'll not go into that. There's also sine, tangent, theta. There's reactants and power factor. So for ohm's law for AC is different from ohm's law for DC. That's because of the sinusoidal waveform. Yes? Would you like to answer? Come. Say it. Say it. Say it. No, say it. Royce, you know the answer. Come. For what is reactant? Yeah? For me, the power is reactant. Yes. I'm asking you. You should, you should. Come, come, come. This is a formula, but. So you are the one in parallel. I know. I'm just a, I'm just a newbie hammy. Come on, say it. Okay. Never mind. All right. And finally, I wanted to point out some physics law that might be pretty interesting. If you kind of Google for 17 equations that change the world, there are some things like Pythagoras theorem. A lot of them are mathematical. Laws of gravity and but I think Fourier transform is something that we use for modulation, demodulation. There is also Pythagoras theorem a little bit for AC circuits in a slightly different way. When you try to calculate. Calculate reactants. Yeah, calculate reactants. So there are some, the rest are pretty much like, I would say more of physics, but it was interesting to see some physics laws here as well. So in summary, if you are a beginner on a revise, there is Ohm's law for DC circuits. There is Kirchhoff's law. There is also calculation for resistance, inductance and capacitance. And a whole different bunch of equations for AC circuits. If you wanna go through a thorough revision, sign up for Ham radio license examination and you will go through all of this once again. All right, that's it. And let's have a revision on this. Thank you.