write a difference between AC and DC
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In direct current (DC), the electric charge (current) only flows in one direction. Electric charge in alternating current (AC), on the other hand, changes direction periodically. The voltage in AC circuits also periodically reverses because the current changes direction.
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Ac current changes its direction during flow while the DC current does not changes its direction during flow and remains constant. The AC current is generated by the alternator while DC current is generated by Photovoltaic cells, generators and batteries.
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