# Definition:Joule (Unit)

## Definition

The joule is the SI unit of energy.

It is defined as being:

the energy transferred to (or work done on) a body when a force of $1$ newton acts on that body in the direction of the force's motion through a distance of one metre
the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second.

### Symbol

$\mathrm J$

The symbol for the joule is $\mathrm J$.

Its $\LaTeX$ code is \mathrm J .

### Base Units

The SI base units of the joule are:

$\mathrm J := \mathrm {kg} \, \mathrm m^2 \mathrm s^{-2}$

where:

$\mathrm {kg}$ denotes kilograms
$\mathrm m$ denotes metres
$\mathrm s$ denotes seconds (of time).

## Source of Name

This entry was named for James Prescott Joule.