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The devices inside a PC that actually do the work, meaning the IC "chips", all

operate on relatively low voltage DC. Exceptions might be the cooling fan and

the hard-disk-drive motor, but the actual electronics needs pure low-voltage DC.

That's decidedly NOT what you get from the wall outlet, so every computer needs to

include a substantial section called the "power supply", where the kind of power

that's also used to operate dishwashers and hair-dryers is stepped down, rectified,

regulated, and purified, to produce power that processors and other ICs can use.

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Q: What type of voltage does a PC use?
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