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Why we use DC for charging of Batteries??Why not AC
Supply???
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Answer Posted / ratan nura
In AC supply, both voltage and current have a sinusoidal nature i.e. voltage changes from 0-V and V-0 for positive cycle and 0 to -V and -V to 0 for negative cycle. the same happens for the current.
Charging of a battery requires a constant current
I > the output current of the battery. If the value of current keeps changing (i.e from 0-I,I-0, 0 to -I, -I to 0), the free electrons in the electrodes get released in the liquid alkali solution and energy is stored inside the battery as chemical energy for positive cycle. But for the negative cycle, the free electrons inside the battery accumulate in the electrodes thus charging the AC supply, i.e. in negative cycle the terminal voltage of the battery is equal to battery supply voltage + AC supply voltage. This can be dangerous for the battery as it may get neutralized and further charging becomes impossible.
Hence DC source is used for charging the battery and not AC.
Note : Charging of a battery depends on the source voltage and not current. source with excessive current can burn the battery or it may explode. So for this purpose current is kept as low as possible...
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