
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A fluorescent bulb is typically 4 times more efficient than an incandescent bulb. For example, a fluorescent bulb using 15 W of electrical power makes as much light as an incandescent bulb using 60 W of power. If electrical energy costs 6 cents/kW · hr, how much money would you save by using one of these fluorescent bulbs instead of one incandescent for 1 yr?
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- It seems hard to justify spending $4.00 for an LED lightbulb when an ordinary incandescent bulb costs $0.50. To see if it makes sense, compare a 60 W incandescent bulb that lasts 1000 hours to a 10 W LED bulb that lasts 20,000 hours. (These are typical values.) Both bulbs produce the same amount of visible light and are interchangeable.arrow_forwardHow much could you pay to replace a 60 W incandescent light bulb with a 15 W compact fluorescent bulb if electricity in your area costs 10 cents per kilowatt hour and you paid 25 cents for the incandescent bulb? You estimate that you will break even after about 1000 hours.arrow_forwardYou are given the job of evaluating potential power line systems. One system is designed to operate at V = 3000 V, and another would operate at V = 6500 V. Suppose the power line at the higher voltage would dissipate 3 % of the power that it carries. What percentage of the power would be dissipated in the low-voltage power line?arrow_forward
- 15: Suppose a heart defibrillator dissipates 410 J of energy in 12 ms. What is the average power output of the defibrillator, in W?arrow_forwardAn alternative to CFL bulbs and incandescent bulbs are light-emitting diode (LED) bulbs. A 100-W incandescent bulb can be replaced by a 16-W LED bulb.Both produce 1600 lumens of light. Assuming the cost of electricity is $0.10 per kilowatt-hour, how much does it cost to run the bulb for one year if it runs for four hours a day?arrow_forward
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