[Jon Stratis]

Laymen's terms... There's "magic smoke" in the electronics that make it work. Trust in the magic smoke!

All kidding aside, at the level of most teams, I think it's important to explain the relationship between power, voltage, and current, but further details (like circuit diagrams) can be glossed over. I think it's OK to describe things as "magic boxes" that they can learn more about in their college course work, as the amount of background information needed to really understand them is enormous - especially if you don't 110% understand it yourself. Don't try to explain something you don't know perfectly, as you'll only confuse everyone!