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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 was cumbersome and limited the number of components that could be used. Today, computers and other electronic devices use integrated circuits (ICs), in which all the electronic components are fabricated as a single unit. All the interconnections between the components are also part of that one unit.