Storage Batteries
The term storage battery has been used for many years as the name for a battery of secondary cells, and particularly for lead-acid batteries
A cell is a source of e.m.f in which chemical energy is converted into electrical energy
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.A cell is a D.C source device in which difference of electric potential is established between the two electrodes as a result of chemical reactions between the electrodes and the electrolyte. A cell essentially consists of the following active materials:
1. Positive electrode (plate or rod)
2. Negative electrode (plate or rod)
3. Electrolyte and a container
The e.m.f of a single cell is generally small (1.5/2 V or so) so that current delivered by it to the external circuit is quite low. Many commercial applications require appreciable D.C supply. Under such conditions, a number of cells are connected electrically usually in series (or parallel). Such a combination of cells in known as a battery. Batteries are playing an important role in may industrial and commercial applications e.g. transistor radios, telephone exchange, electrical sub-stations, generating stations, mines etc.
Accumulator is a term sometimes applied to a storage battery.
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