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How To Install . . .Power Supplies October 1999 • Vol.7 Issue 10 Add To My Personal Library How To Install . . .Power Supplies One thing every personal computer has in common is a need for a power supply. Whether you have a slim-line desktop PC or a full-sized floor standing tower PC, somewhere in it is a device that turns alternating current (AC) into direct current (DC). The main job of a computer's power supply is to provide smooth and consistent DC voltage to the motherboard, central processing unit (CPU), and the various drives in the computer. A typical power supply will put out +5, -5, +12, and -12 volts of DC. Newer ATX-style power supplies also put out +3.5 volts of DC. Whatever the style, the power supply is the keystone of the computer. When the power supply starts to fail or malfunction, your computer can do strange things. It can spontaneously reboot right in the middle of a program or it can freeze up and corrupt data on your hard drive. This doesn't mean that any computer that occasionally locks up has a bad power supply. However, if your computer freezes up quite often, your power supply may be part of the problem. A healthy power supply is vital to the overall performance of your system. Your power supply also helps dissipate heat in your computer. Most power supplies have a fan that draws cool air through the computer case and out through the vents in the back of the power supply. This accomplishes two things. First, it keeps the power supply cool. Converting the AC power into DC creates a
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Power Supplies

Power supplies are devices that produce AC or DC power.  This grouping includes current sources, DC power supplies, AC-DC adapters, DC-DC converters, AC power sources, and DC-AC inverters.

Computer Power Supplies

Computer power supplies convert alternating current (AC) line to direct current (DC) line, needed by the computer.

Single Phase Uninterruptible Power Supplies (UPS)

Single phase uninterruptible power supplies (UPS) sit between an AC outlet and an electronic device to provide power conditioning, back-up protection, and distribution for electronic equipment loads. They also prevent power disturbances from affecting the performance and life of the electronic device and vital data. 

Uninterruptible Power Supplies (UPS)

Uninterruptible power supplies (UPS) are backup batteries that provide emergency power to electrical systems in case power becomes unavailable. They are connected between a power source (such as an electrical outlet) and the equipment to protect (such as a motor or computer).

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