Question

Suppose you have a friend who invented a time machine. It consumes 1.21 GW of electricity (though, for some reason, he pronounced it as jiga-watts). However, running low on nuclear fuel, a lightning bolt can supply more than enough (on average 10.0 GW).

Having just taken a physics course in college, you point out that that extra energy has to go somewhere. If the duration of power transfer is 2.00s, and the rest of the energy was redirected into a battery, how many electric cars could be turned on and driven for 10.0s, simultaneously, by that battery (round down to the nearest whole car)?

Answer 1