Electrical energy is carried through a circuit by electrons. The energy each electron has is called electric potential energy. It is measured in volts. Because electric potential energy is measured in volts, it is often called voltage. A voltmeter is a device that measures voltage. It can be connected onto the energy source or the load. When you connect the device to the positive and negative terminals of a battery, it measures the difference in volts between both sides.
Amber: So, Nicki asked us to write her profile... Blaze: So, what exactly are we supposed to write about? Eric: About her, I suppose. Amber: So, what exactly do we know about Nicki? Blaze: She likes writing. Amber: Uh, yeah! We're her characters, remember? Blaze: Yeah, yeah. So, what else? That she likes reading? Eric: Yes, I suppose we could say that. Amber: So, what else? Eric: She likes history. Wow, I wasn't expecting it to be this hard to write about her. Amber: Then let's leave it at that. It isn't as if she was expecting a book. Blaze: That's her department, after all.