PSU

The power supply unit (PSU) is essentially the power translator for a computer. It takes the power from the wall (alternating current) and turns it into power that computers can utilize (direct current). The PSU provides power to all components of the computer, allowing it to run smoothly.

A black computer case sitting on top of a yellow surface

A black computer case sitting on top of a yellow surface

PSUs also tend to have protective features that prevent power surges which can lead to computer damage.
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a black computer case sitting on top of a wooden table

a black computer case sitting on top of a wooden table