OverviewHistoryChemistry and principlesTypesPerformance, capacity and dischargeLifespan and enduranceHazardsLegislation and regulation
An electric battery is a source of electric power consisting of one or more electrochemical cells with external connections for powering electrical devices. When a battery is supplying power, its positive terminal is the cathode and its negative terminal is the anode. The terminal marked negative is the source of electrons. When a battery is connected to an external electric load, those neg…
Battery of Leyden Jar "capacitors" linked together (Image courtesy of Alvinrune of Wikimedia Commons). Invention of the Battery. One fateful day in 1780, Italian physicist, physician, biologist, and philosopher, Luigi Galvani, was dissecting a frog attached to a brass hook.As he touched …