What is Power supply?

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A Power supply also known as power supply unit or PSU, is the component that supplies power to an electronic device such as a computer. All electronic circuits need to be powered from a reliable direct current (DC) source and such power source must be generated from an everlasting source of alternating current (AC) power.

There are a wide variety of power supplies including batteries, fuel cells, electro-mechanical generators, alternating current to direct current supplies, inverters, and alternating current supplies, among many others....