Here's the answer

April 28, 2020   photos  

Ac is alternating current, it means changing current, and dc is direct current. It means no changing, there for we only store the dc current. Battery is from two types of cell Anode and cathode, the direct current we connect to a battery with same polarity for store we can easily store dc. Dc current goes through the same cathode and to anode and save the charge. Current is made by potential difference between two electrodes with change of chemical energy to electrical with two charge point. Ac has alternating positive and negative, but chemical change does not reactive alternatively.