A 60W incandescent light bulb costs $0.25 and lasts 1 year. A compact fluorescent light (CFL)...
A 60W incandescent light bulb costs $0.25 and lasts 1 year. A compact fluorescent light (CFL) capable of producing the same amount of light costs $2, consumes 13W, and lasts 8 years. Assume electricity costs $0.10/kWh, the bulbs are operated for 5 hrs/day, and all money spent is taken out of a saving account earning 2% interest.
(a) What is the net present cost associated with the incandescent bulb? The CFL?
(b) The carbon emissions rate for Duke-Progress Energy is 1,118 lbs CO2/MWh. If I switch from an incandescent bulb to CFL, what is the implicit mitigation cost ($/metric ton) of CO2 reduction?
Homework Answers
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A 60W incandescent light bulb costs $0.25 and lasts 1 year. A
compact fluorescent light (CFL)...
Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They...
Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They initially cost much more, but last far longer and use much less electricity. According to one study of these bulbs, a compact bulb that produces as much light as a 100 W incandescent bulb uses only 23.0 W of power. The compact bulb lasts 1.00×104 hours, on the average, and costs $ 11.0 , whereas the incandescent bulb costs only 76.0 ¢, but lasts...
Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They...
Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They initially cost much more, but last far longer and use much less electricity. According to one study of these bulbs, a compact bulb that produces as much light as a 100 W incandescent bulb uses only 23.0 W of power. The compact bulb lasts 1.00×104 hours, on the average, and costs $ 12.0 , whereas the incandescent bulb costs only 75.0 ¢, but lasts...
1. A fluorescent light bulb can replace an incandescent light bulb but it is more expensive...
1. A fluorescent light bulb can replace an incandescent light bulb but it is more expensive to buy. 42W fluorescent bulb is considered to be equivalent to 150W incandescent bulb. The fluorescent light bulb cost 5$ while the incandescent one cost 1$. Price of electricity is 10c/kwh. Does it pay to replace? 2. For a gasification project, 50,000 tons of coal per day will be used to produce 50 million cft/day. What is the efficiency of the process? 3. Assume...
The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the...
The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7,520 hours. The population standard deviation is 840 hours. A random sample of 49 light bulbs indicates a sample mean life of 7,340 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7,520 hours? b. Compute the p-value and interpret its meaning. c. Construct...
The quality control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether...
The quality control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7.496 hours. The population standard deviation is 92 hours. A random sample of 64 light bulbs indicatos a sample mean life of 7,473 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7,496 hours? b. Compute the p-value and interpret its meaning. c....
1. A fluorescent light bulb can replace an incandescent light bulb but it is more expensive to buy. 42W fluorescent bulb is considered to be equivalent to 150W incandescent bulb. The fluorescent light bulb cost 5$ while the incandescent one cost 1$. Price of electricity is 10c/kwh. Does it pay to replace? 2. For a gasification project, 50,000 tons of coal per day will be used to produce 50 million cft/day. What is the efficiency of the process? 3. Assume...
The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7,520 hours. The population standard deviation is 840 hours. A random sample of 49 light bulbs indicates a sample mean life of 7,340 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7,520 hours? b. Compute the p-value and interpret its meaning. c. Construct...
The quality control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7.496 hours. The population standard deviation is 92 hours. A random sample of 64 light bulbs indicatos a sample mean life of 7,473 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7,496 hours? b. Compute the p-value and interpret its meaning. c....
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