In the cathode half-cell, electrons enter in the case of a voltaic cell.
A primary cell is a cell that generates electrical energy without first being charged by an external source of electricity. As long as the active material is present, chemical reactions in this sort of cell provide electrical energy. Once the primary cell is depleted, it cannot be recharged once again.
Once a secondary voltaic cell has been utilized, it can be recharged once more by running an electric current in the opposite direction. It can therefore be applied repeatedly. When the cell is charged, chemical changes take place, and these changes are then reversed when the cell is discharged.
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