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A kilowatt hour (kWh) is used to measure energy consumption. It is defined as 'the energy consumed, over a period of one hour, at a rate of one kilowatt'.

To determine how many kilowatt hours are consumed, you must multiply the power of the lamp, expressed in kilowatts, by the length of time it is in use, expressed in hours.

So, a 45-W lamp will use: (45/1000) x 1 = 0.045 kWh per hour of use.

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