# Joule

- The SI unit of energy is the joule. Defined as:
- 1 joule is the work done by a force of 1 newton moving a distance of 1 metre in the direction of the force.
- It may also be defined in electrical terms as:
- the amount of energy needed to sustain 1 amp for 1 sec in a 1-ohm resistance.

Named after James Prescott Joule, one of the first to measure the "rate of exchange" between mechanical energy and heat.

Dimension: ML^{2}T^{-2}

1 J = 1 kgm^{2}s^{-2}

1 calorie | = | 4.1868 joules | 1 kilowatt hour | = | 3.6x10^{6} J | |

1 therm (EEC) | = | 105.506x10^{6} J | 1 therm (US) | = | 105.4804x10^{6} J | |

1 thermie | = | 4.185407x10^{6} J | 1 ft lb | = | 1.3558179 J | |

1 Btu | = | 1055 J | 1 electron volt | = | 1.602x10^{-19} J | |

1 joule | = | 10^{7} ergs | 1 MMcfe | = | 1.091 terajoules |

### MMcfe

A unit used in the natural gas industry for one million cubic feet of gas equivalent (cfe).

This is a unit of energy equal to about 1.091 terajoules (GJ).

**See also: **Approximate Energy, Calorie, Energy, Erg, Foot Pound, kiloWatt hour, Watt, Work.

**Subjects: ** Units