Power may refer to any of the following:
1. Electricity used by a computer or other electronic devices is often referred to as power. In the United States, power coming from a standard wall socket is AC, which is then converted to DC when it gets to you device. The picture is a power warning sign, indicating the danger of electrocution.
2. When describing a computer in general, power is used to describe the computer's capabilities, such as how fast it is. The overall performance of a computer is often determine using benchmark software.
3. Command used with some versions of Windows on portable computers that allows you to conserve energy. See the power command page for additional information.