An electromagnetic bomb, or e-bomb, is a weapon designed to take
advantage of this dependency. But instead of simply cutting off power
in an area, an e-bomb would actually destroy most machines that use
electricity. Generators would be useless, cars wouldn't run, and there
would be no chance of making a phone call. In a matter of seconds, a
big enough e-bomb could thrust an entire city back 200 years or
cripple a military unit.