Unit | Value |
---|---|

Joule | |

Kilojoule | |

Gram calorie | |

Kilocalorie | |

Watt hour | |

Kilowatt hour | |

Electronvolt | |

British thermal unit | |

US therm | |

Foot-pound |

Unit | Value |
---|---|

Joule | |

Kilojoule | |

Gram calorie | |

Kilocalorie | |

Watt hour | |

Kilowatt hour | |

Electronvolt | |

British thermal unit | |

US therm | |

Foot-pound |

**Joule:** A Joule is the SI unit of energy or work and is equal to the amount of energy transferred when applying a force of one newton through a distance of one meter. It is named after the British physicist James Prescott Joule.

**Kilojoule:** A Kilojoule (kJ) is a unit of energy equal to 1,000 Joules. It is commonly used in scientific contexts to measure energy in various processes, such as metabolism, combustion, and mechanical work.

**Gram calorie:** A gram calorie, often just referred to as a calorie, is the amount of energy needed to raise the temperature of one gram of water by one degree Celsius at a pressure of one atmosphere. It is commonly used in food energy measurements.

**Kilocalorie:** A kilocalorie (kcal) is equal to 1,000 gram calories or 4.184 kilojoules. It is often used interchangeably with the term "Calorie" (capital C) in the context of food energy, which can sometimes cause confusion.

**Watt hour:** A watt hour (Wh) is a unit of energy equivalent to one watt of power used for one hour. It is commonly used in the electricity industry to measure energy consumption in homes and businesses.

**Kilowatt hour:** A kilowatt hour (kWh) is equal to 1,000 watt hours and is a standard unit of energy used by electric utilities to measure electrical energy consumption. One kilowatt hour is equivalent to 3.6 million Joules.

**Electronvolt:** An electronvolt (eV) is a unit of energy used in particle physics, equal to the amount of kinetic energy gained or lost by a single electron when it is accelerated through an electric potential difference of one volt. It is a very small unit of energy, approximately 1.6 x 10^{-19} Joules.

**British thermal unit:** A British thermal unit (BTU) is a traditional unit of heat energy, defined as the amount of energy required to raise the temperature of one pound of water by one degree Fahrenheit at sea level. One BTU is approximately equal to 1,055 Joules.

**US therm:** A US therm is a unit of heat energy equivalent to 100,000 British thermal units. It is commonly used in the natural gas industry in the United States to measure energy content and consumption.

**Foot-pound:** A foot-pound (ft-lb) is a unit of work or energy in the Imperial system, defined as the amount of energy required to move an object weighing one pound a distance of one foot against a force of one pound. One foot-pound is equivalent to approximately 1.356 Joules.