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Power Supply Unit. Desktop computers have a power supply unit located within the system unit that plugs into a standard wall outlet, converting AC to DC, which becomes the power to drive all of the system unit components.
This arrangement is most commonly. used where the need for low first-cost, simplicity, and space economy outweigh the need for enhanced reliability. Typical equipment for this system arrangement is a single unit substation consisting of a fused primary switch, a transformer of sufficient size to supply the loads, and a low voltage switchboard.