Hey, so check out this model of an electric system I made. Looks really cool. How does it work? I've got two bottles up top that represent a battery source, so one positive, one negative. I've got a consumer below, and then I've got a pump just to put work into the system itself. So, does the water in the sources represent the current thing? Not exactly. The water represents the voltage difference in the system. Why don't you give it a try? I see. So, the difference in the water height represents a voltage polarity, and that means that charge is being moved from this side over to this side. Exactly.