Why Laptops Need Power Management and Plug and Play

Power management is the process of controlling power flow to a machine’s built-in hardware and attached peripherals. For example, a power management system can "suspend" a laptop after the user has been inactive for a while, turning off power-consuming peripherals, such as the video display and disk drives, and reducing processor clock speed. Laptop users need good power management because it can extend the battery life of a laptop by a factor of four or greater.

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