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Power Input

The power input to a power supply is the power which enables it to function. It may be direct current (DC) that does not change polarity, such as the output of solar cells or a battery; or it may be alternating current (AC) that regularly changes polarity, such as from a power utility or a vehicle’s alternator. AC usually has a sinusoidal waveshape, but in certain instances it may alternately be a square wave.

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