PC Power Supply

PC Power Supply. The PSU (Power Supply Unit) is the thing that gives your PC its actual life, without it your box of silicon cant do anything, and if it fails, it still wont do anything. Most PC's now have a standard size PSU but with different wattage. 300W, 400W, 500W etc. A basic rule of thumb is, the higher the wattage output the more devices you can attach without any noticeable depreciation of system performance. If you want to know even more about power supplies, have a look at Wikipedia
(Wikipedia Link), there's volumes of information about PSU's and their wily ways.