University Physics Volume 2
18th Edition
ISBN: 9781938168161
Author: OpenStax
Publisher: OpenStax
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 9, Problem 4CQ
Incandescent light bulbs are being replaced with more efficient LED and CFL light bulbs. Is there any obvious evidence that incandescent light bulbs might not be that energy efficient? Is energy converted into anything but visible light?
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
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. What is the resistance of a “100 W” fluorescent bulb? (Remember, it actually uses only 23 W of power and operates across 120 V.)
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. What is the total cost (including the price of the bulbs) to run each bulb for 3.0 years?
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?
Chapter 9 Solutions
University Physics Volume 2
Ch. 9 - Check Your Understanding Handheld calculators...Ch. 9 - Check Your Understanding Circuit breakers in a...Ch. 9 - Check Your Understanding In Example 9.4, the drift...Ch. 9 - Check Your Understanding The current density is...Ch. 9 - Check Your Understanding Copper wires use...Ch. 9 - Check Your Understanding A strain gauge is an...Ch. 9 - Check Your Understanding The resistance between...Ch. 9 - Check Your Understanding The voltage supplied to...Ch. 9 - Check Your Understanding Electric motors have a...Ch. 9 - Check Your Understanding Is the efficiency of the...
Ch. 9 - Can a wire cany a current and still be...Ch. 9 - Car batteries are rated in ampere-hours (Ah). To...Ch. 9 - When working with high-power electric circuits, it...Ch. 9 - Incandescent light bulbs are being replaced with...Ch. 9 - It was stated that the motion of an electron...Ch. 9 - Electric circuits are sometimes explained using a...Ch. 9 - An incandescent light bulb is partially evacuated....Ch. 9 - The [R drop across a resistor means that there is...Ch. 9 - Do impurities in semiconducting materials listed...Ch. 9 - Does the resistance of an object depend on the...Ch. 9 - If aluminum and copper wires of the same length...Ch. 9 - In Determining Field from Potential, resistance...Ch. 9 - Shown below are the results of an experiment where...Ch. 9 - The current I is measured through a sample of an...Ch. 9 - Common household appliances are rated at 110 V,...Ch. 9 - Your electric bill gives your consumption in units...Ch. 9 - Resistors are commonly rated at 18W,14W,12W ,1 W...Ch. 9 - Ail immersion heater is a small appliance used to...Ch. 9 - What requirement for superconductivity7 makes...Ch. 9 - Name two applications for superconductivity listed...Ch. 9 - A Van de Graaff generator is one of the original...Ch. 9 - A cathode ray tube (CRT) is a device that produces...Ch. 9 - How many electrons flow through a point in a wire...Ch. 9 - A conductor carries a current that is decreasing...Ch. 9 - The quantity of charge through a conductor is...Ch. 9 - The current through a conductor is modeled as...Ch. 9 - The charge on a capacitor in a circuit is modeled...Ch. 9 - An aluminum wire 1.628 mm in diameter (14-gauge)...Ch. 9 - The current of an election beam has a...Ch. 9 - A high-energy proton accelerator produces a proton...Ch. 9 - Consider a wire of a circular cross-section with a...Ch. 9 - The current of an electron beam has a measured...Ch. 9 - The current supplied to an ail conditioner unit is...Ch. 9 - What current flows through the bulb of a 3.00-V...Ch. 9 - Calculate the effective resistance of a pocket...Ch. 9 - How many volts are supplied to operate an...Ch. 9 - What is the resistance of a 20.0-m-long piece of...Ch. 9 - The diameter of 0-gauge copper wire is 8.252 mm....Ch. 9 - If the 0. 10.0-mm-diameter tungsten filament in a...Ch. 9 - A lead rod has a length of 30.00 cm and a...Ch. 9 - Find the ratio of the diameter of aluminum to...Ch. 9 - What current flows through a 2.54-cm-diameter rod...Ch. 9 - (a) To what temperature must you raise a copper...Ch. 9 - A resistor made of nichrome wire is used in an...Ch. 9 - Of what material is a resistor made if its...Ch. 9 - An electronic device designed to operate at any...Ch. 9 - (a) Of what material is a wire made, if it is 25.0...Ch. 9 - Assuming a constant temperature coefficient of...Ch. 9 - A copper wire has a resistance of 0.500 at 20.0°C...Ch. 9 - A 2.2-k resistor is connected across a D cell...Ch. 9 - A resistor rated at 250 k is connected across two...Ch. 9 - A resistor is connected in series with a power...Ch. 9 - A resistor is placed in a circuit with an...Ch. 9 - The following table show the measurements of a...Ch. 9 - A 20.00-V battery is used to supply current to a...Ch. 9 - What is the maximum voltage that can be applied to...Ch. 9 - A heater is being designed that uses a coil of...Ch. 9 - An alternative to CFL bulbs and incandescent bulbs...Ch. 9 - The power dissipated by a resistor with a...Ch. 9 - Running late to catch a plane, a driver...Ch. 9 - SI. A physics student has a single-occupancy dorm...Ch. 9 - A 0.50-W, 220- resistor carries the...Ch. 9 - Consider a power plant is located 60 km away from...Ch. 9 - A wire is drawn through a die, stretching it to...Ch. 9 - Digital medical thermometers determine temperature...Ch. 9 - Electrical power generators are sometimes "load...Ch. 9 - A 12-guage gold wire has a length of 1 meter. (a)...Ch. 9 - What is the change in temperature required to...Ch. 9 - A coaxial cable consists of an inner conductor...Ch. 9 - A 10.00-meter long wire cable that is made of...Ch. 9 - A nichrome rod that is 3.00 mm long with a cross...Ch. 9 - The temperature in Philadelphia, PA can vary...Ch. 9 - When 100.0 V is applied across a 5-gauge (diameter...Ch. 9 - A wire with a resistance of 5.0 is drawn out...Ch. 9 - What is the resistivity of a wire of 5-gauge wire...Ch. 9 - Coils are often used in electrical and electronic...Ch. 9 - Currents of approximately 0.06 A can be...Ch. 9 - A 20.00-ohm; 5.00-watt resistor is placed in...Ch. 9 - A battery with an emf of 24.00 V delivers a...Ch. 9 - A 12.00-V battery has an internal resistance of a...Ch. 9 - A 10-gauge copper wire has a cross-sectional area...Ch. 9 - The current through a 12-gauge wire is given as...Ch. 9 - A particle accelerator produces a beam with a...Ch. 9 - In this chapter, most examples and problems...Ch. 9 - A current of I= 25A is drawn from a 100-V...Ch. 9 - Consider a square rod of material with sides of...Ch. 9 - A resistor of an unknown resistance is placed in...Ch. 9 - The charge that flows through a point in a wire as...Ch. 9 - Consider a resistor made from a hollow cylinder of...Ch. 9 - What is the current through a cylindrical wire of...Ch. 9 - A student uses a 100.00-W, 115.00-V radiant heater...Ch. 9 - A 12-V car battery is used to power a 20.00-W,...Ch. 9 - A physics student uses a 115.00-V immersion heater...
Additional Science Textbook Solutions
Find more solutions based on key concepts
10. A sonic boom cannot be produced by
an aircraft flying at less than the speed of sound.
a whip.
a speeding b...
Conceptual Physical Science (6th Edition)
40. A 5.0-rn-diameter merry-go-round is initially turning with a
4.0 s period. It slows down and stops in 20 s...
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
34. An 80-cm-long, 1.0-mm-diameter steel guitar string must be tightened to a tension of 2.0 kN by turning the ...
College Physics: A Strategic Approach (3rd Edition)
By what factor is the image magnified for an object 1.5 focal lengths from a converging lens? Is the image upri...
Essential University Physics: Volume 2 (3rd Edition)
Write each number in decimal form.
27. 7.77 × 108
Applied Physics (11th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- The 20-W LED bulb can provide the same amount of light output as the 100-W incandescent light bulb. How much percentage you could save for using the LED bulb in place of the incandescent bulb for one year, assuming ₱7.50 per kilowatt-hour is the average energy rate charged by the power company? Assume that the bulb is turned on for 7 hours a day. a.) 20% b.) 80% c.) 150% d.) none of the abovearrow_forwardThe lighting needs of a classroom are met by 30 fluorescent lamps, each consuming 80 W of electricity . The lights in the classroom are kept on for 12 hours a day and 250 days a year. For a unit electricity cost of 11 cents per kWh, determine annual energy cost of lighting for this classroom. Also, discuss the effect of lighting on the heating and air-conditioning requirements of the room.arrow_forwardA faculty administration wants to change all fluorescent lights in rooms, labs, and classrooms. There are 250 lambs. A regular bulb is 5 TL and a LED bulb is 45 TL. A regular bulb consumes 40 Watts electricity whereas a LED bulb consumes 6 Watts. If electricity price is 0.80 TL per kilowatt-hour, how many days later will LED bulbs be more economical. Assume average working time (of all bulbs) is 6 hours. Note that the time for average life of the bulbs is 3 years.arrow_forward
- A certain solar cell type has an output capability of 0.5 Amp at 0.7 V. A series / parallel solar array has been designed of such cells with 221 parallel strings and each string has 105 cells in series. Current capability of array in Amperes = ........... Complete the answer.arrow_forwardA 60-W incandescent light bull costs $0.41. An equivalent 18-W compact fluorescent (CFL) bulb costs $1.10, and an equivalent 9-W light emitting diode (LED) bulb costs $2.00. If the electric company charges $0.1075 per kWh, how many hours would you need to run the CFL and LED light bulb to save money?arrow_forwardAn electric water heater is designed to produce 48 kWkW of heat when it is connected to a 240-V source. If the heater is 88 %% efficient, how long would it take to heat 51 galgal of water from 20∘C∘C to 60 ∘∘? Express your answer using two significant figures.arrow_forward
- Compact fluorescent tubes cost $15 each and have an estimated life span of 8,000 hours. These tubes consume 20 W of power, but produce illumination equivalent to that of 75 W incandescent bulbs. These cost $3.75 each and have an estimated life span of 1,200 hours. If a home has, on average, six 75W incandescent bulbs on constantly and energy costs $0.2875 per kilowatt-hour, how much money will a consumer save each year by installing fluorescent tubes instead?arrow_forwardIt 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_forwardThe typical replacement for a 100-W incandescent bulb is a 20-W LED bulb. The 20-W LED bulb can provide the same amount of light output as the 100-W incandescent light bulb. What is the cost savings for using the LED bulb in place of the incandescent bulb for one year, assuming $0.10 per kilowatt-hour is the average energy rate charged by the power company? Assume that the bulb is turned on for three hours a day.arrow_forward
- In a particular town, electrical energy costs $0.12 per kilowatt-hour. (Round your answers, in dollars, to at least two decimal places.) (a) How much does it cost to operate an old-style incandescent 100-W light bulb continuously for 24 hours? $ (b) A modern LED light bulb that emits as much visible light as a 100-W incandescent only draws 16.0 W of power. How much does it cost to operate this bulb for 24 hours? $ (c) A particular electric oven requires a potential difference of 220 V and draws 20.0 A of current when operating. How much does it cost to operate the oven for 4.80 hours? $arrow_forwardA string of 28 identical Christmas tree lightsare connected in series to a 120 V source. Thestring dissipates 64 W.What is the equivalent resistance of thelight string?Answer in units of Ω.What is the resistance of a single light?Answer in units of Ω.What power is dissipated in a single light?Answer in units of W.arrow_forwardA 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?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Domestic Electric Circuits; Author: PrepOnGo Class 10 & 12;https://www.youtube.com/watch?v=2ZvWaloQ3nk;License: Standard YouTube License, CC-BY