Is there anybody who knows how to do this? This is part of an assignment for my

Question

Is there anybody who knows how to do this? This is part of an assignment for my Power Electronics course and I really need help! Here's how the problem works:

Figure: Percentage use of electricity in various sectors in the U.S.

As the pie chart of the Figure shows, lighting in the United States consumes 19% of the generated electricity. Compact Fluorescent Lamps (CFLs) consume power one-fourth of that consumed by the incandescent lamps for the same light output (http://www.energystar.gov/index.cfm?fuseaction=find_a_product.showProductGroup&pgw_code=LB). According to Edison Electric Institute's Statistical Yearbook (http://www.eei.org), electricity generation in the United States in the year 2000 was approximately 3.8 x 109 MW-hrs. Based on this information, estimate the savings in MW-hrs annually, assuming that all lighting at present is by incandescent lamps, which are to be replaced by CFLs.

Explanation / Answer

Power Consumed by Lighting by Incandescnent bulbs is 19 % of total power

PLighting =0.19*3.8*109 =7.22*108 MW

given

PCFL=(1/4)PLighting

So Power Consumed by CFL Lamps is

PCFL=(1/4)*7.22*108 MW=1.805*108 MW

So Power Saved by using CFL in place incandescent lamps is

P=PLighting-PCFL=7.22*108-1.805*108

P=5.415*108 MW

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