A power supply is an electronic device or system designed to convert electrical energy from a source (such as AC mains, batteries, or generators) into the specific voltage, current, and frequency required by electrical or electronic equipment (known as the "load"). Its core function is to stabilize and regulate electrical parameters, ensuring that the load receives a consistent, safe, and reliable power input—protecting the load from voltage fluctuations, surges, or noise in the original power source.
