High-Efficiency Power Supplies for Home Computers and Servers

Most likely, the computer you’re using wastes 30-40% of the electrical power it consumes because it is using an inefficient power supply. It’s difficult to believe that something as basic as a power supply could be responsible for that amount of waste, but it’s true. The problem with power supplies is that they generate heat, which saps away energy meant to power the computer. That happens when the power supply converts AC current into the DC current needed by computers. [via]

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