Electrical Engineering ⇒ Topic : Primary and Secondary Cells

Primary cells:- The simple voltage cell is a primary cell. A primary cell supplies current until the electrolyte is exhausted or the negative electrode is completely dissolved. The shelf life of a primary cell is about one year.

Secondary Cells:- Whereas a primary cell can supply current until the electrolyte is exhausted or the negative electrode is completely dissolved and the cell has to be discarded,the secondary cell can be recharged by passing a current in an opposite direction to the current that normally flows from the cell.

• Most of the dry cells are primary cells (zinc carbon cells)
• Lead acid cell is a secondary cell.