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Winn L. Rosch Hardware Bible, Sixth Edition by Winn L. Rosch

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Power Supplies

The intermediary that translates AC from your electrical outlets into the DC that your computer's circuits need is called the power supply. As it operates, the power supply of your computer attempts to make the direct current supplied to your computer as pure as possible, as close to the ideal DC power produced by batteries. The chief goal is regulation, maintaining the voltage as close as possible to the ideal desired by the circuits inside your computer.

The power needs of the circuitry of desktop and notebook computers are the same. Both are built with the same circuitry with the same voltage and similar current requirements. Ultimately, both kinds of computers draw power from the same source—electric utilities. But they differ ...

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