## Conversions

Physics Narrative for 11-14

#### Standard and not so standard units

The standard unit for energy is the joule, but not all energies are quoted in joules. There is therefore a very real chance that you will come across data in awkward units. If you need to perform conversions, the following tables should help.

Energy conversion table

energy unit | equivalent |
---|---|

joule | 1 J |

kilojoule | 1000 J |

megajoule | 1 000 000 J |

gigajoule | 1 000 000 000 J |

terajoule | 1 000 000 000 000 J |

Btu | 1055 J |

therm | 105 500 000 J |

gallon of petrol | 131 000 000 J |

barrel of petrol | 5 498 000 000 J |

barrel of crude oil | 6 119 000 000 J |

ton of coal | 21 896 000 000 J |

million cubic feet of natural gas | 1 083 000 000 000 J |

calorie | 4.1868 J |

kilocalorie | 4186.8 J |

kilowatt-hour | 3 600 000 J |

Power conversion table

quantity | equivalent |
---|---|

1 Btu per hour | 0.293 W |

1 joule per second | 1 W |

1 kilowatt hour per day | 41.7 W |

1 food calorie per minute | 69.77 W |

1 horsepower | 745.7 W |

1 kilowatt | 1000 W |

1 Btu per second | 1054 W |

1 gallon of gasoline per hour | 39 kW |

1 million barrels of oil per day | 73 GW |