Capacitors, Magnetic Circuits, and Transformers is a free introductory textbook on the physics of capacitors, coils, and transformers. See the editorial for more information....

Storage Batteries

Large amounts of energy can be stored in electric storage batteries. Consider a 6-v battery rated 100 amp-hr. If the drop in voltage is neglected as the battery gives up its charge, the energy given up by the battery is 600 whr. This amounts to 600 x 3600 = 2.18 x 106 j or the equivalent of about 14 percent of the energy stored in a pound of coal.

Last Update: 2011-01-08