Companies that supply mains electricity charge customers for amount of electrical energy used, and this is measured in kilowatt hours. A kilowatt hour is the amount of energy that is tranfered by a one kilowatt device when used for one hour.
The amount of energy in kWh transfered to a mains device can be found by multiplying the power of the device in kilowatts by the time it is used for in hours.
The eletricity meter in a house records the number of kilowatt hours of energy is used. If the previous meter reading is subtracted from the current reading, the electrical energy used between the readings can be calculated. The cost of the electrical energy supplied is found by multiplying the number of kWh by the cost per kWh, which is given on a electricity bill.
REMEMBER: kilowatt hours is a unit not a measure of power or energy.
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