### Joule definition

The joule is a derived unit of energy in the International System of Units. It is equal to the energy transferred to (or work done on) an object when a force of one newton acts on that object in the direction of the force's motion through a distance of one metre (1 newton metre or N⋅m). 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).

One joule can also be defined as the following:

- The work required to move an electric charge of one coulomb through an electrical potential difference of one volt, or one coulomb-volt (C⋅V). This relationship can be used to define the volt.
- The work required to produce one watt of power for one second, or one watt-second (W⋅s) (compare kilowatt-hour – 3.6 megajoules). This relationship can be used to define the watt.

The joule is named after James Prescott Joule. As with every SI unit named for a person, its symbol starts with an upper case letter (J), but when written in full it follows the rules for capitalisation of a common noun; i.e., "joule" becomes capitalised at the beginning of a sentence and in titles, but is otherwise in lower case.

### Practical examples

One joule represents (approximately)

- The kinetic energy of a 2 kg mass traveling at 1 m/s
- The energy required to lift a medium-sized tomato up 1 metre (3 ft 3 in) (assume the tomato has a mass of approximately 100 grams (3.5 oz)).
- The energy required to accelerate a 1 kg mass at 1 m⋅s−2 through a distance of 1 m.
- The heat required to raise the temperature of 1 g of water by 0.24 °C.
- The typical energy released as heat by a person at rest every 1/60 s (approximately 17 ms).
- The kinetic energy of a 50 kg human moving very slowly (0.2 m/s or 0.72 km/h).
- The kinetic energy of a 56 g tennis ball moving at 6 m/s (22 km/h).
- The amount of electricity required to light a 1 W LED for 1 s.

A kilowatt-hour is 3.6 megajoules.

### Multiples of joule

source: https://en.wikipedia.org/wiki/Joule

Submultiples | Multiples | |||||
---|---|---|---|---|---|---|

Value | SI symbol | Name | Value | SI symbol | Name | |

10^{−1} J | dJ | decijoule | 10^{1} J | daJ | decajoule | |

10^{−2} J | cJ | centijoule | 10^{2} J | hJ | hectojoule | |

10^{−3} J | mJ | millijoule | 10^{3} J | kJ | kilojoule | |

10^{−6} J | µJ | microjoule | 10^{6} J | MJ | megajoule | |

10^{−9} J | nJ | nanojoule | 10^{9} J | GJ | gigajoule | |

10^{−12} J | pJ | picojoule | 10^{12} J | TJ | terajoule | |

10^{−15} J | fJ | femtojoule | 10^{15} J | PJ | petajoule | |

10^{−18} J | aJ | attojoule | 10^{18} J | EJ | exajoule | |

10^{−21} J | zJ | zeptojoule | 10^{21} J | ZJ | zettajoule | |

10^{−24} J | yJ | yoctojoule | 10^{24} J | YJ | yottajoule | |

Common multiples are in bold face |

### Conversions

1×10^{7} erg (exactly)

6.24150974×10^{18} eV

0.2390 cal (gram calories)

2.390×10^{-4 }kcal (food calories)

9.4782×10^{-4} BTU

0.7376 ft⋅lb (foot-pound)

23.7 ft⋅pdl (foot-poundal)

2.7778×10^{-7 }kW⋅h (kilowatt-hour)

2.7778×10^{−4} W⋅h (watt-hour)

9.8692×10^{−3} l⋅atm (litre-atmosphere)

11.1265×10^{−15} g (by way of mass-energy equivalence)

1×10^{−44} foe (exactly)

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