Joule

The joule (symbol: J) is the SI unit of energy, or work. It is named in honor of the physicist James Prescott Joule (1818–1889).

Definition

The joule is a derived unit defined as the work done,or energy required, to exert a force of one newton for a distance of one metre, so the same quantity may be referred to as a newton metre or newton-metre (also with meter spelling), with the symbol N·m or N m. It can also be written as kg·m2·s−2. However, the newton metre is usually used as a measure of torque, not energy.

Related Topics:
Force - Newton - Metre - Kg - S - Torque

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One joule is also:

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• the work required to move an electric charge of one coulomb through an electrical potential difference of one volt; or one coulomb volt, with the symbol C·V.
• the work done to produce power of one watt continuously for one second; or one watt second (compare kilowatt-hour), with the symbol W·s