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Pulsed DC (PDC) or pulsating direct currentis a periodic current which changes in value but never changes direction.

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1.DIRECT CURRENT

Direct current is electric current that only flows in one direction. A common place to find direct current is in batteries

2.ALTERNATING CURRENT
It alternates in direction.
This is because when electricity is produced in large scale, such as in a power plant, it has dangerously high voltage.

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Symmetrical current

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Alternating and direct current