Its because we are made up of energy. To get electricity to flow in water easy, you use calcium or aluminium. You ask where is the electricity. Its going through us as we speak with AC current. You can speed up or slow down the AC pulse. To control. An incandescent light flickers at 60 times a sec. Depending on nuke temp or coal temp. http://www.popsci.com/environment/article/2009-01/harvesting-energy-humans