<Tr> <Th> British Gravitational units </Th> <Td> ≈ 85,429,300 ft ⋅ pdl </Td> </Tr> <P> The kilowatt hour (symbol kWh, kW ⋅ h or kW h) is a unit of energy equal to 3.6 megajoules . If energy is transmitted or used at a constant rate (power) over a period of time, the total energy in kilowatt hours is equal to the power in kilowatts multiplied by the time in hours . The kilowatt hour is commonly used as a billing unit for energy delivered to consumers by electric utilities . </P> <P> The kilowatt hour (symbolized kW ⋅ h as per SI) is a composite unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour . One watt is equal to 1 J / s . One kilowatt hour is 3.6 megajoules, which is the amount of energy converted if work is done at an average rate of one thousand watts for one hour . </P> <P> The base unit of energy within the International System of Units (SI) is the joule . The hour is a unit of time "outside the SI", making the kilowatt hour a non-SI unit of energy . The kilowatt hour is not listed among the non-SI units accepted by the BIPM for use with the SI, although the hour, from which the kilowatt hour is derived, is . </P>

1 kw is equal to how many kwh