A 25-w compact fluorescent lightbulb cfl produces the light


A 25-W compact fluorescent lightbulb (CFL) produces the light equivalent of a 100-W incandescent bulb. The population of North America is estimated to be about 305 million. Estimate the amount of coal needed to light one 100-W incandescent lightbulb for each person for one year and the amount of coal that would be saved if each incandescent bulb were replaced with a CFL. Assume the coal has a NHV of 28.5 MJ/kg and the power plants are 33% efficient.

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Civil Engineering: A 25-w compact fluorescent lightbulb cfl produces the light
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