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Answered 2015-09-23 09:55:22

First let us convert the power of the bulb into kilowatts.

A kilowatt is 1000 watts. We have one tenth of that. So 100W = 0.1kW

To work out the kilowatt hours we simply multiply the power in kilowatts by the time the bulb is on for (in hours):

0.1kW x 10h = 1 kWh
a 100 watt bulb uses 100 watts of power. In ten hours it uses 100x10 watt-hours, or 1 kilowatt-hour. A kilowatt-hour is also called a unit, and units are what you pay for.

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