811405-B21 CL 500-Watts Power Supply Unit by HP
811405-B21 General Information:
Product type: Power Supply
Wattage : 500 WATT
811405-B21 power supply. Also called a power supply unit or PSU, the component that supplies power to a computer or servers. Most personal computers can be plugged into standard electrical outlets. The power supply then pulls the required amount of electricity and converts the AC current to DC current. There are 3 types of power supply in common use: AT Power Supply - used in very old PCs. ATX Power Supply - still used in some PCs. ATX-2 Power Supply - commonly in use today. In a personal computer (PC), the power supply is the metal box usually found in a corner of the case. The power supply is visible from the back of many systems because it contains the power-cord receptacle and the cooling fan. All household power outlets and most generators supply AC power. AC never has a polarity, so you would never see + and - marked at... If you're given a power source without any markings on it, take a DC voltmeter and connect it to the voltage source. If there's a deflection, the source is DC, otherwise it's AC. 811405-B21 powersupply
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