--Correct me if I'm wrong, but isn't electricity the flow of electrons.
It's just a model. If negative charges are moving in one direction there are positive moving in the other. I don't think anyone's ever seen anything actually moving.
"If negative charges are moving in one direction there are positive moving in the other."
No, that's not true. The popsitive charge doesn't "move". Only electrons move. Even though it is conceptually taught that the positive charge moves it is really the negatively charge particles that move.