Pushing against a magnetic field. There are a lot of ways to do it, including the generators that turn mechanical energy into electricity. My favorites are fl

Pushing against a magnetic field. There are a lot of ways to do it, including the generators that turn mechanical energy into electricity. My favorites are flux compressors though, for when you to turn the energy in a stick of dynamite into a very sharp current spike. https://en.wikipedia.org/wiki/Explosively_pumped_flux_compression_generator https://en.wikipedia.org/wiki/Explosively_pumped_flux_compre...