[Potironette]

So I can sort of say that voltage is the difference between joules of PE used to move charge in Coulombs at two different points. But what does it mean that joules of PE get used? I mean, in a circuit, isn't PE used up as kinetic energy for electrons all the time? Or is it that because voltage is the difference in energy being used up, it means that only when there is a resistance, more PE is required to move electrons along because electron energy gets lost, then there's a voltage?


So..commas are used if two descriptions of something are independent?
Why would "middle-class Americans" be fine? Is it that if I use "middle-class" it implies white so I don't need to add it?