Question

Explain how an external power source be used to recharge a voltaic cell when it runs down.

Answer 1

In an electrochemical cell, the chemical reaction move only in one spontaneous direction. And when the cellis set up in such a way that it is in the desire direction it is called voltaic cell. But we can change the direction of chemical reaction in the cell in both spontaneous and non-spontaneous direction with the help of external power source by altering the Gibb's free energy. So Voltaic cell can be recharged using external power source changing the direction of chemical reaction to go in the non-spontaneous reverse direction until the original contents are not regenerated.