power supply unit
Also known as PSU, ATX, ATX Power Supply, computer power supply, computer PSU, PC power supply unit, PC power supply, PC PSU
internal computer component that provides power to other components
Article
An ATX power supply unit with top cover removed
A power supply unit (PSU) converts mains AC to low-voltage regulated DC power for the internal components of a desktop computer. Modern personal computers universally use switched-mode power supplies. Some power supplies have a manual switch for selecting input voltage, while others automatically adapt to the main voltage.