Battery (electricity)
Battery (electricity) From Wikipedia, the free encyclopedia For other uses, see Battery (disambiguation) . Battery Various cells and batteries (top-left to bottom-right): two AA , one D , one handheld ham radio battery, two 9-volt (PP3), two AAA , one C , one camcorder battery, one cordless phone battery. Type Power source Working principle Electrochemical reactions , Electromotive force First production 1800s Electronic symbol The symbol for a battery in a circuit diagram . It originated as a schematic drawing of the earliest type of battery, a voltaic pile . An electric battery is a device consisting of two or more electrochemical cells that convert stored chemical energy into electrical energy. Each cell has a positive terminal, or cathode , and a negative terminal, or anode . The terminal marked positive is at a higher electrical poten...
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