One major doubt. You said that the utility puts out electricity at 220V. 220V describes that it does work into giving charge, whereas electricity is a form of energy. My doubt that I am holding from the beginning is that how does charge, being the flow of electrons, relate to electricity, a form of energy.

@JonCuster I appreciate your answer but It would be great if you could explain a bit more deeply. Such as, what do you mean by an an output supply, and it holding at 220v. Also what does it mean to draw 100/120 amps. Kinldy understand since I am stil a schoolboy