Chapter 20: Problem 10: Suppose the cost of an incandescent bulb is 21 cents and that electricity costs 14 cents/kWh. Compact fluorescent lightbulbs (CFL), while they are more expensive, use 1/10 of the power for the same amount of illumination. a) What would be the maximum cost (in dollars) of a CFL such that the total cost (investment plus operating) would be the same for both CFL and incandescent 60 W bulbs? Assume both lightbulbs run for 1000 h.

Chapter 20: Problem 10: Suppose the cost of an incandescent bulb is 21 cents and that electricity costs 14 cents/kWh. Compact fluorescent lightbulbs (CFL), while they are more expensive, use 1/10 of the power for the same amount of illumination. a) What would be the maximum cost (in dollars) of a CFL such that the total cost (investment plus operating) would be the same for both CFL and incandescent 60 W bulbs? Assume both lightbulbs run for 1000 h.

Physics for Scientists and Engineers with Modern Physics

10th Edition

ISBN:9781337553292

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter32: Alternating-current Circuits

Section: Chapter Questions

Problem 1P: (a) What is the resistance of a lightbulb that uses an average power of 75.0 W when connected to a...

See similar textbooks

Similar questions

A 9 W led lightbulb emits the same light as a 60 W standard lightbulb. If a power company charges 10 cents per kW.h, then how much money do you save by using the led lightbulb instead of the standard lightbulb for 30 days?
A compact fluorescent lamp (CFL) uses less energy than its equivalent incandescent bulb. How much will a person save if he/she uses a 20 W CFL instead of a 100 W incandescent lamp for 6 hours in 30 days? Electricity is priced at P8.17 kW/h.
Compact fluorescent bulbs aremuch more efficient at producing light than are ordinary incandescentbulbs. They initially cost much more, but they last far longer and usemuch less electricity. According to one study of these bulbs, a compactbulb that produces as much light as a 100 W incandescent bulb usesonly 23 W of power. The compact bulb lasts 10,000 hours, on the average,and costs $11.00, whereas the incandescent bulb costs only $0.75,but lasts just 750 hours. The study assumed that electricity costs $0.080per kilowatt-hour and that the bulbs are on for 4.0 h per day. How much do you save over 3.0 years if you use a compact fluorescent bulb instead of an incandescent bulb?
6
An 11.0-W energy-efficient fluorescent lightbulb is designed to produce the same illumination as a conventional 40.0-W incandescent lightbulb. Assuming a cost of $0.116/kWh for energy from the electric company, how much money does the user of the energy-efficient bulb save during 200 h of use? (Give your answer to the nearest cent.)
0. An electric power station is producing 1.40 x 10 W of power that is to be sen o* town located 60.0 km away. Each of the two wires that comprise the trannion e resistance per kilometer of length of 400 x 10 Olpe/km. Find the power lont in beatin the wires if the voltage is stepped up from 2200 V to 20000 V using an ideal tranlorr. a) 1.21 x 10 Watts b) 2.32 x 10 Watts c) 1.12 x 10 Watts d) 5.59 x 10 Watts e) 1.16 x 10 Watts nhilo L4.00 yu which have their tratis
The lighting requirements of an industrial facility are being met by 700 40-W standard fluorescent lamps. The lamps are close to completing their service life and are to be replaced by their 34-W high-efficiency counterparts that operate on the existing standard ballasts. The standard and high-efficiency fluorescent lamps can be purchased in quantity at a cost of $1.77 and $2.26 each, respectively. The facility operates 2800 hours a year, and all of the lamps are kept on during operating hours. Taking the unit cost of electricity to be $0.105/kWh and the ballast factor to be 1.1 (i.e., ballasts consume 10 percent of the rated power of the lamps), determine how much energy and money will be saved per year as a result of switching to the high-efficiency fluorescent lamps. Also, determine the simple payback period.
Alfredo deDarke sleeps with a 7.5-Watt night light bulb on. He turns it on before getting in bed and turns it off 8 hours later.a. Determine the amount of energy used during one evening in units of kiloWatt•hours.b. Electrical energy costs 13 cents/kW•hr where Alfredo lives. Determine the annual (365 days) cost of this practice of using a 7.5-Watt night light.c. Determine the annual savings if Alfredo replaced his 7.5-Watt incandescent night light by a 0.5-Watt LED night light.
1. A 1000 W television was used to watch BTS concert for1 hour and 30 minutes. How much energy is used if the electricity at home is 340 volts? What is the current in the television?
How much money will a homeowner owe an electric company if he turns on a 100.00-W incandescent light bulb and leaves it on for an entire year? (Assume that the cost of electricity is Php12.00/kWh and that the light bulb lasts that long.) The same amount of light can be provided by a 26.000-W compact fluorescent light bulb. What would it cost the homeowner to leave one of those on for a year?
A string of 16 identical holiday tree lights is connected in series to a 120 V source. The string dissipates 64 W. a) What is the equivalent resistance of the light string? b) What is the resistance of a single light? c)What power is dissipated by each light?
An incandescent lightbulb is an inexpensive but highly inefficient device that converts electrical energy into light. It converts about 10 percent of the electrical energy it consumes into light while converting the remaining 90 percent into heat. The glass bulb of the lamp heats up very quickly as a result of absorbing all that heat and dissipating it to the surroundings by convection and radiation. Consider an 8-cm-diameter 60-W lightbulb in a room at 25°C. The emissivity of the glass is 0.9. Assuming that 10 percent of the energy passes through the glass bulb as light with negligible absorption and the rest of the energy is absorbed and dissipated by the bulb itself by natural convection and radiation, determine the equilibrium temperature of the glass bulb. Assume the interior surfaces of the room to be at room temperature.