I've a question on Back to the Future, namely in how the time machine works. Dialogue tells us 1.21 gigawatts of electricity is needed to power the Flux Capacitor in order to allow for time travel. (And then there's 88 miles an hour or something in there.) Anyway, in the first movie Doc uses nuclear fission in order to obtain this incredible level of power which for the purposes of this discussion we'll assume that a single Plutonium pellet and the reactor in the DeLorean is enough to generate this power. (We'll also assume that a handful of garbage and some really incredible cold fusion does this in the other movies.) So Marty is trapped in 1955, no Plutonium (although, surprisingly enough, Plutonium is pretty easy to get a hold of in 1955) and him and Doc concoct a plan to channel a bolt of lightning into the time machine to provide the 1.21 GW of electricity to allow for the time travel. My question is... Is a bolt of lightning the same power as power from a nuclear reaction? I mean even going to AC vs. DC, what about amps, volts, all of the other properties and such of electricity. Electricity is a bit more complex than watts meeting watts isn't it?