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).

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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.

SI: The International System of Units (abbreviated SI from the French phrase, Syst?me International d'Unit?s) is the most widely used system of units. It is the most common system for everyday commerce in the world, and is almost universally used in the realm of science....

Energy: Energy is a fundamental quantity that every physical system possesses. Energy of physical system in a certain given state is defined as the amount of work W needed to change the state of the system from some initial state (called reference state or reference level) to the given state....

Work: In physics, work is defined as the integral of dot product of force times infinitesimal translation::: W = int mathbf{F} cdot mathrm{d}mathbf{s}...