Compact fluorescent lamps (CFLs) have become required in recent years, but do th
ID: 2716045 • Letter: C
Question
Compact fluorescent lamps (CFLs) have become required in recent years, but do they make financial sense? Suppose a typical 60-watt incandescent lightbulb costs $.46 and lasts for 1,000 hours. A 15-watt CFL, which provides the same light, costs $3.45 and lasts for 12,000 hours. A kilowatt-hour is 1,000 watts for 1 hour. Suppose you have a residence with a lot of incandescent bulbs that are used on average 500 hours a year. The average bulb will be about halfway through its life, so it will have 500 hours remaining (and you can’t tell which bulbs are older or newer).
If you require a 11 percent return, at what cost per kilowatt-hour does it make sense to replace your incandescent bulbs today? Please indicate all the steps and formulas
Compact fluorescent lamps (CFLs) have become required in recent years, but do they make financial sense? Suppose a typical 60-watt incandescent lightbulb costs $.46 and lasts for 1,000 hours. A 15-watt CFL, which provides the same light, costs $3.45 and lasts for 12,000 hours. A kilowatt-hour is 1,000 watts for 1 hour. Suppose you have a residence with a lot of incandescent bulbs that are used on average 500 hours a year. The average bulb will be about halfway through its life, so it will have 500 hours remaining (and you can’t tell which bulbs are older or newer).
Explanation / Answer
Answer:
Therefore in order to get 11 percent return where the cost of Incasdescant for 1 year = 0.23per kilowatt
and the cost for CFL =0.2875 pe kilowatt
Therfore at 0.2875 it makes sense to replace the bulb
Thank you
category bulb in watts cost o/p in hous Incandescant 60 0.46 1000 CFL 15 3.45 12000 Converting CFL for 1000 hours ie dividing 3.45/12 CFL 15 0.2875 1000 Incandescant 0.46 2years Therefore for 1 year cost 0.23Related Questions
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