* A power supply is installed in the back corner of the PC case, next to the motherboard.
* It converts 120vac (standard house power) into DC voltages that are used by other components in the PC.
* A 20 conductor cable carries +5vdc, -5vdc +12vdc, -12vdc and ground to the motherboard.
* Another pair of cables, each with four conductors and two 4-pin connectors daisy-chained along it, carry +5vdc, +12vdc and ground to the drives (hard, floppy and CD/DVD).
* Typical PC power supplies are rated at 200-250 watts and sell for about $50 - $75. Higher wattage supplies are available.
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