Teaching Physics with the Physics Suite

Edward F. Redish

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Saving on your electric bill

a. Flourescent bulbs deliver the same amount of light using much less power. If one kW-hr costs 10, estimate the amount of money you would save each month by replacing all the 75 W incandescent bulbs in your house by 15 W flourescent ones.

b. A typical large power plant might generate 1000 Megawatts (1 GW) of electrical power. If all the households in the US were using incandescent bulbs and switched to flourescent, estimate the number of power plants that would no longer be needed.

Be sure to clearly state your assumptions, since grading on this problem will be mostly based on your reasoning, not on your answer.


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Page last modified February 21, 2008: E11