# Joule

## Unit of energy in the SI system / From Wikipedia, the free encyclopedia

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The **joule** (pronounced /ˈdʒuːl/, *JOOL* or /ˈdʒaʊl/ *JOWL*; symbol: **J**) is the unit of energy in the International System of Units (SI).^{[1]} It is equal to the amount of work done when a force of one newton displaces a mass through a distance of one metre in the direction of that force. It is also the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second. It is named after the English physicist James Prescott Joule (1818–1889).^{[2]}^{[3]}^{[4]}

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This article is about the unit of energy or work. For other uses, see Joule (disambiguation).

**Quick Facts**Unit system, Unit of ...

joule | |
---|---|

Unit system | SI |

Unit of | energy |

Symbol | J |

Named after | James Prescott Joule |

Conversions | |

1 J in ... | ... is equal to ... |

SI base units | kg⋅m^{2}⋅s^{−2} |

CGS units | 1×10^{7} erg |

watt-seconds | 1 W⋅s |

kilowatt-hours | ≈2.78×10^{−7} kW⋅h |

kilocalories (thermochemical) | 2.390×10^{−4} kcal_{th} |

BTUs | 9.48×10^{−4} BTU |

electronvolts | ≈6.24×10^{18} eV |

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