Hey, guys. So, I want to talk about something called electric charge in this video. You're going to need to know it for this chapter, but also for other chapters in this course. So let's get to it. But first off, I want to sort of briefly reintroduce you to an atom's and atomic structure. So remember that atoms are made of protons, neutrons, and electrons. And these protons and neutrons sit inside of this central structure in the atom that we call the nucleus. Whereas the electrons sort of float around on the outside and they orbit this nucleus. Now, there's something special about these electrons and these protons. They have a property called electric charge whereas the neutrons do not. The electric charge is a property of matter. It's just something that matter has similar to mass. So if you've seen the gravitation chapter, we can actually draw some important analogies between mass and electric charge. For instance, in gravitation, we needed mass in order to create a force. And the more mass that we had, the more gravity or the stronger that that gravitational force was. It's very similar for electric charge. You need charge in order to create an electric force, and the more charge that you have, the more or stronger that electric force becomes. Now, where things start to get a little bit different is that in mass and gravitation, we only assumed that these numbers were positive. Positive 5 kilograms, 10 kilograms, whatever. You couldn't have a negative mass. Well, physicists a couple of hundred years ago noticed that there were different interactions between charges, such that there could be positive or negative. We'll talk about that a little bit later. So, you can actually have positive and negative charges. One of the other main differences is that in mass, there was never, like, a smallest amount of mass that we could have, at least physicists that seem to think so. But in electric charges, there is something called the elementary charge. What that means is it is the smallest amount of charge that something could possibly have. And it's a letter known as e, which is
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Electric Charge
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