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    How much energy is required for wattage

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    If a customer replaces a 85 watt bulb with an 20 watt compact fluorescent bulb that lasts 5000 hours, how much less coal (lbs)will be used to generate the electricity that is saved? Assume the electricity is generated with 30% efficiency and the energy content of the coal is 30 kJ/g.

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    Solution Preview

    Remember Power(W)=Energy(J)/Time(s)

    Hence the energy saved in 5000 hours by using 20W-bulb instead of ...

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