13. An energy-efficient fluorescent lightbulb operating at power P1 = 28 W can produce the same level of brightness as a conventional incandescent lightbulb operating at power P, = 100 W. Lifetime of the energy-efficient bulb is T1 = 10000 h, and its purchase price is B1 = $4.50. Lifetime of the conventional bulb is T2 = 750 h, and its purchase price is B2 = $0.42. Suppose electrical energy costs R = $0.20/kWh, i.e. 20 cents per kilowatt- hour. a) Calculate the total cost of using energy-efficient bulbs over 10,000 hours. b) Calculate the total cost of using conventional bulbs over 10,000 hours. Note that you must include both the cost of purchasing the bulbs and the cost of energy. %3D

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it the minimum average power?
13. An energy-efficient fluorescent lightbulb operating at power Pı = 28 W can produce the
same level of brightness as a conventional incandescent lightbulb operating at power P,
100 W. Lifetime of the energy-efficient bulb is T = 10000 h, and its purchase price is
B1 = $4.50. Lifetime of the conventional bulb is T2 = 750 h, and its purchase price is
B2 = $0.42. Suppose electrical energy costs R = $0.20/kWh, i.e. 20 cents per kilowatt-
hour. a) Calculate the total cost of using energy-efficient bulbs over 10,000 hours. b)
Calculate the total cost of using conventional bulbs over 10,000 hours. Note that you
must include both the cost of purchasing the bulbs and the cost of energy.
Transcribed Image Text:it the minimum average power? 13. An energy-efficient fluorescent lightbulb operating at power Pı = 28 W can produce the same level of brightness as a conventional incandescent lightbulb operating at power P, 100 W. Lifetime of the energy-efficient bulb is T = 10000 h, and its purchase price is B1 = $4.50. Lifetime of the conventional bulb is T2 = 750 h, and its purchase price is B2 = $0.42. Suppose electrical energy costs R = $0.20/kWh, i.e. 20 cents per kilowatt- hour. a) Calculate the total cost of using energy-efficient bulbs over 10,000 hours. b) Calculate the total cost of using conventional bulbs over 10,000 hours. Note that you must include both the cost of purchasing the bulbs and the cost of energy.
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