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by Answerbag Staff on November 7th, 2009

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How much energy does a light bulb consume?

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  • by S. Johnson on November 7th, 2009

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    Professionally Researched. (What's this?)

    A light bulb's watts tells you how much electricity it consumes in an hour: a 100-watt bulb uses 100 watts per hour. A kilowatt-hour (kWh) is kilowatts used per hour (utility companies charge by kilowatt-hour); 1,000 watts is 1 kilowatt. So, a 100-watt bulb left on for an hour uses .10 kWh.

    Source:

    PDF: How Much Energy Does a Light Bulb Use and What Will It Cost Me?

    Residential Lighting Use and Potential Savings-Energy Information Administration

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