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30 minutes is 0.5 hours.

1 kilowatt = 1000 watts, so divide both sides by 1000 and you get .001 kilowatts = 1 watt

So

8 watts x 30 minutes = .008 kilowatts x 0.5 hours = .004 kilowatt hours.

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Q: 8 watts for 30 minutes is how many kilowatt hours?
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