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PSU
Power Supply Unit – The powerplant of your computer system. The PSU transforms the AC from the walloutlet to DC that the computer runs on.

PWM
Pulse-Width Modulation – A technology that sends pulses of DC to a unit, for instance a fan, making the fan spin slower. If 12 volts is applied 50% of the time it will run at 50% percent speed, while the other 50% of the current is desipated as heat.