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Power Supply unit (computer) 

 

 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 computer. Modern personal computers universally use a switched-mode power supply. Some power supplies have a manual selector for input voltage, while others automatically adapt to the supply voltage.

 

POWER SUPPLYprovides regulated power to every system component, and it cools the computer. The 3.3- and 5-volts are typically used by digital circuits, while the 12-volt is used to run motors in disk drives and fans.

Power supply

Voltages:

Yellow: +12 voltsRed:

+5 voltsBlack:

GroundOrange:

+3.3 volts ATX