What Are the Different Parts of a Power Supply in a Computer?
The power supply is the most important part of a computer and its components; without it, nothing works. A properly matched computer power supply will provide years of trouble-free service.
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Power Supply Case
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Inside a power supply--note the yellow transformer The case protects internal components from outside elements and protects users from electric shock.
Fan and Fuse
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Inductors found in power supplies The fan pulls cool air into the power supply; this keeps the components from overheating. The fuse protects the supply and computer circuitry from current overloads and power surges.
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Capacitors and Inductors
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Capacitors, next to an inductor The capacitors (the cylindrical "cans") help to filter and stabilize the power going from the supply to the computer. The inductors (coils) filter noise in the power lines that could interfere with the computer's operation. Capacitors can hold lethal voltages.
Transformers, Cables and Wires
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Wires from a power supply Transformers step the voltage down to the standard voltages: +5V, -5V, +12V, -12V and +3.3V for the computer components. The power supply has cables that connect to the computer components, including the power button.
Semiconductor Components
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An LED (Light-Emitting Diode), capacitor, resistor and diode The diodes and rectifiers change the alternating current (AC) to direct current (DC). Voltage regulators stabilize the output voltages during heavy loads.
Warning
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Voltage regulators and transistors vary in size. Never try to take the case off a power supply--doing so presents a shock hazard or even voids the computer warranty. Always unplug the computer before disassembling.
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References
- Photo Credit power supply image by robert mobley from Fotolia.com power supply image by pmphoto from Fotolia.com macro electronics image by Tony Durose from Fotolia.com pc due image by Renato Francia from Fotolia.com medusa color image by robert mobley from Fotolia.com tech parts image by naolin from Fotolia.com transistor image by Alex from Fotolia.com
