The power supply (power supply unit or PSU) is a rectangular box with
several cables that fits in the top back of the case. Its primary
purpose is converting AC power from an outlet to DC power the computer
can use. The cables have connectors on the ends which supply different
voltages to various internal components with the main connector plugging
into the motherboard. However some, called modular power supplies,
contain built-in connectors so you can use only the cables that are
necessary.
Power supplies conform to the ATX factor and come in a range of
different wattages - from less than 300W to more than a 1000W. Which
should you buy? Depends on what type of system you have. For the average
system with one or two hard drives, a DVD drive, dual core CPU, and a
low-end graphics card, I would suggest at least a 500W PSU. If you plan
on adding more drives, get a unit that can handle the job. Better yet,
go ahead and buy a 600 or 700 watt just in case upgrading is in your
future. Very powerful machines such as gaming systems can use power
supplies that are 1000W or more. Motherboards designed for SLI or
Crossfire have PSUs specifically made for them. After purchasing, make
sure the voltage is set to the correct number by using the voltage
selector (100-120V for N. America. & 220-240V for Europe). Thermal
Take, Cool Max, and Cooler Master are just some of the major
manufacturers of PSUs.
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Refer site :.learning-about-computers.com
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