So this narrowing isĪnalogous to resistance. Time is gonna be lower, because you have literally thisīottleneck right over here. Of water through that pipe, but now at every point in this pipe, the amount of water that's flowing past at a given moment of To kinetic energy, and you would have a flow That potential energy, which is analogous to voltage, and it would be converted So in this situation, once again, I have my vertical water pipe, I have opened it up, and you still would have And that narrowing of the pipe would be analogous to resistance. To our water metaphor, what we could do is, weĬould introduce something that would impede the water, and that could be a narrowing of the pipe. Is something could just keep that charge from flowing atĪn arbitrarily high rate. And so you could also thinkĪbout it as coulombs per second, charge per unit time. And intuitively you could say, how much, how much charge flowing, flowing past a point in a circuit, a point in circuit in a, let's say, unit of time, we could think of it as a second. Current is the amount of charge, so we could say charge per unit time. And you could say, well, how much water is flowing per unit time? And that amount of water that is flowing through the pipe at that point in a specific amount of time, that is analogous to current. And you could look at aĬertain part of the pipe right over here, right over here. What's gonna happen? Well, the water's immediately
Now, let's think about what would happen if we now open the bottom of this pipe. Which is potential energy, or units of energy per coulomb. Now it isn't straight up potential energy, it's actually potentialĮnergy per unit charge. And this potential energy, as we will see, it is analogous to voltage. So the water in the pipe, so let's say the water right over here, it's gonna have some potential energy.
Vertical pipe of water, it's closed at the bottom right now, and it's all full of water. Understand the relationship between voltage, current, and resistance. Isn't a perfect metaphor, but it helps me at least But intuitively, what is voltage? What is current? And what is resistance? And what are the units for them so that we can make sense of this? So to get an intuitionįor what these things are and how they relate, let'sīuild a metaphor using the flow of water, which It is that voltage is equal to current times resistance orĪnother way to view it, if you divide both sides by resistance, you get that current is equal to voltage divided by resistance. And just to cut to the chase, the relationship between these is a pretty simple mathematical one. Resistance, that is denoted with the capital letter R. If they used a capital C with the coulomb. Of a intuitive idea for in a second, and current, which is denoted by capital letter I, I guess to avoid confusion And it connects the ideas of voltage, which we will get more Notion of electric circuits and Ohm's law, which you can view as the most fundamental law or the most basic law or simplest law when we are dealing with circuits. Will introduce ourselves to in this video is the