The Power Supply Unit (“PSU”) supplies the motherboard, drives and other components with electricity. In a standard desktop PC, the PSU is attached to the tower case. A kettle cord is plugged into a wall socket and into the PSU, or a connecting cable is connected to the output socket of a UPS into the PSU.

The PSU receives an input of 230V AC from the wall socket. The PSU steps this down to various amounts of DC current for the computer’s components; for example, a CPU cooling fan would require something in the region of 12V DC and an HDD 12V DC for its motor and 5V DC for the data, while a RAM module 1.2V to 1.5V DC.

  • A rectifier converts AC into DC.
  • A transformer changes the incoming voltage to the needed outgoing voltage level. These devices may step up or step down the voltage.

Various cables with a variety of different plugs supply various different voltages to the motherboard and other components. HDDs, SSDs, CD-ROMS and DVD-ROMS are all supplied directly from the PSU.

The fan keeps the PSU cool.

Power Supply Unit from a desktop PC.
Power Supply Unit from a desktop PC.

Resources:

  1. https://www.actpower.com/educational/what-is-a-power-supply-and-how-does-it-work/

By MisterFoxOnline

CAT Educator

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