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A Kilowatt hour is 1000 watts per hour.

A 50 watt bulb will use just 50 watts per hour.

Therefore over 12 hours the 50 watt bulb will use 50*12 watts = 600 watts or 0.6 of a kilowatt hour.

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10y ago
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Q: How many kilowatt-hours do 50 w used for 12h equal?
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