Conversion of units of energy

Conversion of units of energy

The SI unit for energy is the joule.

The kilowatt hour, or kilowatt-hour, (symbol kW·h, kW h or kWh) is equal to 3.6 megajoules.

The large calorie, kilogram calorie, dietary calorie or food calorie (symbol: Cal) approximates the energy needed to increase the temperature of 1 kilogram of water by 1 °C. This is about 4.182 kilojoules.

Tonne of oil equivalent:

The IEA/OECD define one toe to be equal to 41.868 GJ[1] or 11.63 MWh.

A gram of TNT releases 980–1100 calories upon explosion. To define the tonne of TNT, this was arbitrarily standardized by letting 1000 thermochemical calories = 1 gram TNT = 4184 J (exactly).[2]

Unit Exajoule 1018 J Petajoule 1015 J Terajoule 1012 J Gigajoule 109 J Megajoule 106 J Kilojoule 103 J joule
British thermal unit (BTU) 1.055 1,055
food calorie 4.182 4 182
1 Wh 3.6 3 600
1 kWh 3.6 3 600 3 600 000
1 MWh 3.6 3 600 3 600 000 3 600 000 000
1 GWh 3.6 3 600 3 600 000 3 600 000 000 3 600 000 000 000
1 TWh 3.6 3 600 3 600 000 3 600 000 000 3 600 000 000 000 3 600 000 000 000 000
1 PWh 3.6 3 600 3 600 000 3 600 000 000 3 600 000 000 000 3 600 000 000 000 000 3 600 000 000 000 000 000
1 Toe 41.868 41 868 41 868 000 41 868 000 000

References

  1. ^ "Energy Units". American Physical Society. 2011. http://www.aps.org/policy/reports/popa-reports/energy/units.cfm. Retrieved 2011-08-18. 
  2. ^ NIST Guide for the Use of the International System of Units (SI): Appendix B8—Factors for Units Listed Alphabetically

See also


v · d · eEnergy
Fundamental concepts
Energy · Power · Energetics · Laws of thermodynamics · Units of energy · Conversion of units of energy
Primary energy sources
Fossil fuel (Coal, Petroleum, Natural gas) · Mineral fuel (Natural uranium) · Solar · Wind · Bioenergy (Biomass) · Water (Hydroenergy, Marine energy) · Geothermal
Energy carriers
Energy systems
Oil refinery · Fossil fuel power station (Coal-fired power plant, IGCC power plant, CHP plant) · Nuclear power (Nuclear power plant) · Solar power (Photovoltaic power plant, CSP plant) · Solar thermal energy (Solar power tower, Solar furnace) · Wind power (Wind farm, Offshore wind farm, Small-scale wind turbine, HAWP plant) · Hydropower (Hydropower plant, Wave farm, Tidal power station) · Biomass-fueled power plant · Geothermal power plant

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