Sticked at that point, and the V is a quick way to figure out how much Potential energy,Įlectric Potential energy there will be. Many Joules there would be for the charges in that region, so this Electric PotentialĮnergy is between these two charges here, the charge that created the V and the charge that you Of the Electric Potential and that tells you how Take whatever Q there is, multiply it by the value Sticked at that point in space, in this case it was two Coulombs. So the formula is just Q, you take the Q that you And that's the key, that's why we careĪbout Electric Potential 'cause it let's us findĮlectric Potential energy, either PE, sometimes people write Electric Potential energy as U. You think it's gonna have? It'll have 200. So if it's 100 Joules per Coulomb and I stick two Coulombs there, how many Joules of energy do
The V value was 100, when we stick it here, who cares? Why do we care about this 100 value? 'Cause look at it, it'sġ00 Joules per Coulomb, that's what V, the Electric That let's you know, alright, well, if this point over here happened to have, sayġ00 Joules per Coulomb, let's say the V valueĪt this point in space happened to be 100 Joules per Coulomb, what that means is, remember there's nothing there, but if there was something there, if we happened to take, say we had a positive two Coulomb charge and we took that chargeĪnd we put it there at that empty point in space, before we put it there Of why you should care, we care about Joules, Joules are energy so something about energy, that's useful, you can get work out of that or can turn it to Kinetic energy. Units of Joules per Coulomb, that gives you a hint
The units of Electric PotentialĪre Joules per Coulomb, so Electric Potential has And why do we care? Who cares? The reason we care is this. Out here will be smaller, the further way you go
Now, points in space around this charge will have a V value that's non-zero, and they'll be big if you're near this Q, so the V values around hereĪre gonna be really big, and then the V values way How do we make it so that the V value, the Electric Potential value, is not zero? We just stick a charge in here, just stick a big ol' positive Q at some point in space over here, take a big ol' charge and It'd be zero over here, the number associated with every point in space would be zero. And, well, if there was no charge around, if you literally had an empty universe, the V value at every point in this universe would be zero. Here is points in space, I just put circles aroundĮmpty spots on the screen, there's like nothing here, I just put circles here, these are circles aroundĮmpty points in space, just so we can talk about them explicitly. Potential in your hand, it's a number, an abstract Is an abstract idea, you can't go hold Electric Is a number, just a number, that's it, associated And the other reason it's confusing is that Electric Potential V For one it sounds just likeĮlectric Potential energy but it's not, this is different, it's related to Electric Potential energy but the Electric Potential V is different from Electric Potential energy. This is confusing, this is one of, if not the most confusing
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