A 100 watt bulb is left on for 10 hours. How much energy does it consume?
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Correct answer to question 51 (Electronics Information): 1 kilowatt-hour
Method
A 100 watt bulb is 0.1 kilowatt, and running for 10 hours uses 0.1 x 10 = 1 kilowatt-hour. Utility bills are measured in exactly these units.
Updated: November 2026
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