An electrochemical cell is a single arrangement of two electrodes and an electrolyte for producing an electric current due to chemical action within the cell, or for producing chemical action due to passage of electricity. Thus electrochemical cells may be used for two purposes namely.
(i) to convert chemical energy into electrical energy.
(ii) to convert electrical energy into chemical energy.
The common galvanic (or voltaic) cell, dry cell and lead storage battery are devices for converting chemical energy into electrical energy, while the electrolytic cell used for the purification of metals is the device in which electrical energy is used in causing a chemical reaction (electrolysis).
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