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Joule

Last updated: July 19, 2018

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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