Compact fluorescent light (CFL) bulbs have been available for years: they are ve

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Compact fluorescent light (CFL) bulbs have been available for years: they are very efficient, but a little*pricey. A CFL bulb that puts out as much light as a 60-W incandes-cent bulb might cost $10. compared to about $1 for the incandescent bulb. But CFL bulbs are expected to last (on average) 15.000 hours, compared to about 1000 hour» for an incandescent bulb. So it is easy to see that you would need 15 incandescent bulbs (total cost $15) to last the 15.000 hours that you would get from one ($10) CFI. bulb, YOU save $5 and a lot of climbing ladders to replace all those incandescent bulbs. But there's more. A CFL bulb that puts out as much light as a 60-VV incandescent bull) will use about 13 W or power. According to the L'S Knergy Information Administration (www.eia.doe.gov), residential electricity costs average about Si). 10 per kilowatt/hour (1 kw/h = 3600 kW/s = 3600 kj). Over the 15,000 hours that one CFL bulb is expected to last, how much will you save on power if you replace an incandescent bulb in your home with a CFL bulb? Develop an Excel worksheet something like the one shown in Figure 1.72 to find the answer.

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