We just learned about the Disk Drive.
Another part of a computer is the Power Supply.
Everything in the computer uses electricity, like the motherboard, the disk drives, and even some high powered graphics cards.
The power supply takes the electricity coming in from the plug, turns it into the just the right amount and type of power that the computer needs, and it has a bunch of other wires with plugs that go into the motherboard, drives and other places.
The power supply also has a fan on it, that helps keep the computer cool so it doesn't overheat.
(from: wikipedia - power supply unit (computer))
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