What is Joule in physics?

In physics, the Joule (often denoted by the symbol ‘J’) can be defined as the derived unit of energy.


As per the International System of Units (often abbreviated to SI), one Joule is equal to the work done on (or the energy transferred to) an object upon which a force of one Newton is acting to move the object by one metre (in the direction in which the force was applied). The SI unit of energy is named after the English mathematician and physicist James Prescott Joule.

  • Alternately, the Joule can be defined as the heat energy that gets dissipated when one ampere of electric current passes through one meter of a suitable conductor having a resistance of one ohm.
  • The SI base units of the Joule are kilogram meter2 second-2 (or kg.m2.s-2).

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