Answer / p. vara prasad

it's static device which step down/step up the voltage/current

Answer / manikandan p

It is an electronic device that supplies electric energy to an electrical load. The function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.

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