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A kilowatt is 1,000 watts. A 60 watt bulb uses 60 watts in an hour. So, in half an hour it uses 30 watts. Now if a kilowatt costs 20 cents, what does 0.03 kilowatt cost?

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โˆ™ 2009-10-31 13:54:07
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Q: How many kWh does a 60 W light bulb have when left on for 30 minutes?
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