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The joule (J) is the unit of energy.



A joule is defined as the energy required to move a body with a force of 1 newton over a distance of 1 meter. The mass of that body is not important. There is


    N Newton
    m Meter
   kg Kilogram
    s Second
   W Watt

Expressed in the units joule (J), newton (N), meter (m), kilogram (kg), second (s) and watt (W). Thus, a joule is a watt second. 



The name joule is a tribute to English physicist James Prescott Joule (1818 - 1889).

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