Definition - What does Joule mean?

Joule is the unit of electrical, mechanical, and thermal energy. It is derived from the International System of Units.

One joule is equal to:

  • A current of 1 ampere passed through a resistance of 1 ohm for 1 second
  • A force of 1 newton acting through a distance of 1 meter
  • An electric charge of 1 coulomb moved through an electrical potential difference of 1 volt
  • 1 watt of power produced for 1 second

Safeopedia explains Joule

Energy in Joules can be calculated from following formulas for the most common situations:

Electric (power in watts): Joules = Watts × Seconds

Heat: Joules = Work (Force x Distance) in Grams x Specific heat capacity x Temperature (in ºC or ºK)

Static energy: Joule = Mass x Height x Gravity

Kinetic energy: Joule = 0.5 x Mass x Speed2

Work: Joule = Force x Distance

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