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A kilowatt-hour (unit symbol: kW⋅h or kW h; commonly written as kWh) is a non-SI unit of energy equal to 3.6 megajoules (MJ) in SI units which is the energy delivered by one kilowatt of power for one hour. Kilowatt-hours are a common billing unit for electrical energy supplied by electric utilities. Metric prefixes are used for multiples and ...
One kilowatt-hour, of electricity or any other form of energy, is 3.6 MJ. Gigajoule 6 gigajoule is about the chemical energy of combusting 1 barrel (159 L) of petroleum. [22] 2 GJ is about the Planck energy unit. One megawatt-hour, of electricity or any other form of energy, is 3.6 GJ. Terajoule
A unit of electrical energy, particularly for utility bills, is the kilowatt-hour (kWh); [3] one kilowatt-hour is equivalent to 3.6 megajoules. Electricity usage is often given in units of kilowatt-hours per year or other time period. [4] This is actually a measurement of average power consumption, meaning the average rate at which energy is ...
Electrical energy is usually sold by the kilowatt hour (1 kW·h = 3.6 MJ) which is the product of the power in kilowatts multiplied by running time in hours. Electric utilities measure energy using an electricity meter, which keeps a running total of the electric energy delivered to a customer.
The most common unit of measurement on the electricity meter is the kilowatt hour [kWh], which is equal to the amount of energy used by a load of one kilowatt over a period of one hour, or 3,600,000 joules. Some electricity companies use the SI megajoule instead.
= 1 kWh (kilowatt-hour) (used for electricity) [59] 4.2×10 6 J: Energy released by explosion of 1 kilogram of TNT [59] [99] 6.1×10 6 J Kinetic energy of the 4 kg tungsten APFSDS penetrator after being fired from a 120mm KE-W A1 cartridge with a nominal muzzle velocity of 1740 m/s. [113] [114] 8.4×10 6 J
For example, when a light bulb with a power rating of 100 W is turned on for one hour, the energy used is 100 watt hours (W·h), 0.1 kilowatt hour, or 360 kJ. This same amount of energy would light a 40-watt bulb for 2.5 hours, or a 50-watt bulb for 2 hours.
Figures are quoted in terms of the quantity of heat in Btu required to generate 1 kW⋅h of electrical energy. A typical coal-fired power plant works at 10,500 Btu/kWh (3.1 kWh/kWh), an efficiency of 32–33%. [24] The centigrade heat unit (CHU) is the amount of heat required to raise the temperature of one pound of water by one Celsius degree.