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Storage cells

 Storage cells

The basic function of any electrical cell is the conversion of chemical energy into electrical energy. The

cells can be considered as a chemical means of storing electrical energy.


 Electrons are removed from the ( positive ) cathode and deposited on the ( negative ) anode. The electrolyte is the physical means of migration between the cathode/anode.


The attraction of electrons between cathode/anode creates a potential difference across the cell; the cathode/anode are attached to external terminals for connection to the equipment or system. Material types used for the cathode/anode and electrolyte will determine the cell voltage.

  Cells are categorized as either primary (where they can only be used once) or secondary (where they can

be recharged). In the primary cell, the chemical activity occurs only once, i.e.

  during discharge. By applying current through a secondary cell in the opposite direction to that of discharging, the chemical reaction is reversed and the cell can be used again. The cathode/ anode are returned to their original charged form; the cell, therefore, becomes a chemical means of storing

electrical energy.

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