Primary and Secondary cells are the types of electro-chemical cells. In these cells electrical energy is obtained at the cost of chemical reaction.
Primary cells are those in which reaction take place in the electrolyte so it cannot be reversed. As more time cell is in the operation, more concentration of the electrolyte decreases when the concentration of the electrolyte reaches to zero, the cell is to be discarded, .g. Dry Cell.
The other type of the cell is secondary cell in which electrical energy is first stored and then it is slowly released with the help of chemical reactions. Once it is completely used, again it can be stored. So it is the best examples of reversible cells. e.g. Lead accumulators, Alkali storage Cells etc.
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