lm 18 - a room for 15 or more minutes. In areas where...

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Eric Russo 12/7/10 LM 18 1. With incandescent light bulbs, only 10 to 15 percent of the electricity used results in light, the rest of the electricity is turned into heat. The value of energy saved by not on is greater than the cost of having to replace the bulb. -With fluorescent light bulbs it is cost inefficient to turn the light off for short periods of time because there is an increase in power demand when a light is turned on. 2. In the United States it a general rule to turn fluorescent lights off if you are going to leave
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Unformatted text preview: a room for 15 or more minutes. In areas where electric rates are higher, the general rule is to turn the lights off if you are going to leave a room for 5 minutes. 3. The amount of increase in power demand when turning on a fluorescent light depends on the ballast and lamp. Therefore, turning lights off for more than 5 seconds will save more money than the amount of energy consumed when turning the light back on again 4. I got $12, I am not sure where my math went wrong....
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This note was uploaded on 11/11/2011 for the course BCT 191 taught by Professor Staff during the Fall '10 term at UMass (Amherst).

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