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Answered 2010-01-10 02:58:54

The power supplied by a typical household outlet is the wrong type and voltage to be used by most consumer electronics directly, including laptops. The "brick" portion of the power cord is the converter that adapts the power to the correct type needed by the laptop. This component could be included inside the laptop instead of outside in the cable, but this would in turn make the laptop larger and less portable.

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