Question

What makes a secondary cell rechargeable

Answer 1

Dear student,

Secondary cell works on the principle of electrochemistry. They are the galvanic cells where chemical energy is converted to electrical energy.
They consist of a reversible cell reaction that allows them to regain potential which makes a secondary cell rechargeable.
To recharge the secondary cell, a current is passed in the opposite direction, opposite to the flow of current when it was charged and in use. This is the way to recharge the secondary cell.

Regards,