|Name||Symbol||Quantity||Value in SI units|
|kilowatt hour||kW h||energy||3.6 MJ
3.6 × 106 J
The kilowatt hour, symbol kW h, is a non-SI derived unit of energy, accepted for use with the SI. One watt is equal to the power required to transfer energy at a constant rate of one joule per second. It follows that, at a constant power of one kilowatt (kW), the amount of energy transferred in one hour (h) is equal to 3.6 megajoules (MJ), or one kilowatt hour (kW h).
The kilowatt hour is derived from the watt (an SI coherent derived unit) and the hour (a non-SI unit accepted for use with the SI).
|power||× time||= energy||expressed in SI units|
|1000 W||× 3600 s||= 3 600 000 W s||3.6 MJ|
|1 kW||× 1 h||= 1 kW h||3.6 MJ|
The kilowatt hour is a non-SI unit of energy commonly used in household energy bills.