Lightning can strike trees and start fires that way too. Obviously the gold wouldnt engulf in flames because gold isn't flammable. If you want to get technical, the ability to control fire or the ability to control heat on substances is fairly trivial, as it's the heat emitted from fire that inflicts the damage anyway.

Quote Originally Posted by DarthEnder
Well, I suppose it is cheap, but its what electricity does. When you run electricity through metal, the metal heats. It makes perfect sense.
Thx Mr. Physics. The point wasn't whether it made sense or not.