Principles of Physics: A Calculus-Based Text
5th Edition
ISBN: 9781133104261
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 21, Problem 22P
To determine
The reason for which the given situation is impossible.
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Why is the following situation impossible? A politician is decrying wasteful uses of energy and decides to focus on energy used to operate plug-in electric clocks in the United States. While many people use their smartphone as an alarm clock, he estimates that there are still 270 million plug-in alarm clocks in continuous use. The clocks transform energy taken in by electrical transmission at the average rate 2.50 W. The politician gives a speech in which he complains that, at today’s electrical rates, the nation is losing $100 million every year to operate these clocks.
An 11.6 W energy efficient fluorescent light bulb is designed to produce the same illumination as a 42.8 W incandescent light bulb. How much energy does the fluorescent bulb use if it is turned on for 10 hours? Answer in units of Joules. Answer to the one's place.
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Chapter 21 Solutions
Principles of Physics: A Calculus-Based Text
Ch. 21.1 - Consider positive and negative charges moving...Ch. 21.2 - Prob. 21.2QQCh. 21.2 - When does an incandescent lightbulb carry more...Ch. 21.5 - For the two incandescent lightbulbs shown in...Ch. 21.7 - Prob. 21.5QQCh. 21.7 - With the switch in the circuit of Figure 21.18a...Ch. 21.7 - Prob. 21.7QQCh. 21.9 - Consider the circuit in Figure 21.29 and assume...Ch. 21 - If the terminals of a battery with zero internal...Ch. 21 - Wire B has twice the length and twice the radius...
Ch. 21 - The current-versus-voltage behavior of a certain...Ch. 21 - Prob. 4OQCh. 21 - A potential difference of 1.00 V is maintained...Ch. 21 - Prob. 6OQCh. 21 - A metal wire of resistance R is cut into three...Ch. 21 - The terminals of a battery are connected across...Ch. 21 - Prob. 9OQCh. 21 - Two conducting wires A and B of the same length...Ch. 21 - When resistors with different resistances are...Ch. 21 - When operating on a 120-V circuit, an electric...Ch. 21 - Prob. 13OQCh. 21 - Prob. 14OQCh. 21 - In the circuit shown in Figure OQ21.15, each...Ch. 21 - Prob. 1CQCh. 21 - Prob. 2CQCh. 21 - Prob. 3CQCh. 21 - Referring to Figure CQ21.4, describe what happens...Ch. 21 - When the potential difference across a certain...Ch. 21 - Use the atomic theory of matter to explain why the...Ch. 21 - Prob. 7CQCh. 21 - (a) What advantage does 120-V operation offer over...Ch. 21 - Prob. 9CQCh. 21 - Prob. 10CQCh. 21 - If you were to design an electric heater using...Ch. 21 - Prob. 12CQCh. 21 - Prob. 13CQCh. 21 - Prob. 14CQCh. 21 - Why is it possible for a bird to sit on a...Ch. 21 - Prob. 1PCh. 21 - Prob. 2PCh. 21 - The quantity of charge q (in coulombs) that has...Ch. 21 - Prob. 4PCh. 21 - Prob. 5PCh. 21 - Figure P21.6 represents a section of a conductor...Ch. 21 - Prob. 7PCh. 21 - A 0.900-V potential difference is maintained...Ch. 21 - Prob. 9PCh. 21 - A lightbulb has a resistance of 240 when...Ch. 21 - Prob. 11PCh. 21 - Prob. 12PCh. 21 - While taking photographs in Death Valley on a day...Ch. 21 - Prob. 14PCh. 21 - If the current carried by a conductor is doubled,...Ch. 21 - Prob. 16PCh. 21 - Prob. 17PCh. 21 - Prob. 18PCh. 21 - Prob. 19PCh. 21 - Prob. 20PCh. 21 - Prob. 21PCh. 21 - Prob. 22PCh. 21 - Prob. 23PCh. 21 - Prob. 24PCh. 21 - A 100-W lightbulb connected to a 120-V source...Ch. 21 - Prob. 26PCh. 21 - Prob. 27PCh. 21 - Prob. 28PCh. 21 - A toaster is rated at 600 W when connected to a...Ch. 21 - Prob. 30PCh. 21 - Prob. 31PCh. 21 - Review. A well-insulated electric water heater...Ch. 21 - A battery has an emf of 15.0 V. The terminal...Ch. 21 - Two 1.50-V batterieswith their positive terminals...Ch. 21 - An automobile battery has an emf of 12.6 V and an...Ch. 21 - Prob. 36PCh. 21 - Prob. 37PCh. 21 - Prob. 38PCh. 21 - Consider the circuit shown in Figure P21.39. Find...Ch. 21 - Four resistors are connected to a battery as shown...Ch. 21 - Three 100- resistors are connected as shown in...Ch. 21 - Prob. 42PCh. 21 - Calculate the power delivered to each resistor in...Ch. 21 - Prob. 44PCh. 21 - The ammeter shown in Figure P21.45 reads 2.00 A....Ch. 21 - Prob. 46PCh. 21 - The circuit shown in Figure P21.47 is connected...Ch. 21 - In Figure P21.47, show how to add just enough...Ch. 21 - Taking R = 1.00 k and = 250 V in Figure P21.49,...Ch. 21 - For the circuit shown in Figure P21.50, we wish to...Ch. 21 - In the circuit of Figure P21.51, determine (a) the...Ch. 21 - Jumper cables are connected from a fresh battery...Ch. 21 - Prob. 53PCh. 21 - Prob. 54PCh. 21 - Prob. 55PCh. 21 - Prob. 56PCh. 21 - In the circuit of Figure P21.57, the switch S has...Ch. 21 - Prob. 58PCh. 21 - The circuit in Figure P21.59 has been connected...Ch. 21 - Assume that global lightning on the Earth...Ch. 21 - Prob. 61PCh. 21 - Prob. 62PCh. 21 - Prob. 63PCh. 21 - Prob. 64PCh. 21 - Prob. 65PCh. 21 - An oceanographer is studying how the ion...Ch. 21 - The values of the components in a simple series RC...Ch. 21 - Prob. 68PCh. 21 - Prob. 69PCh. 21 - Prob. 70PCh. 21 - The student engineer of a campus radio station...Ch. 21 - Prob. 72PCh. 21 - A battery has an emf and internal resistance r. A...Ch. 21 - Prob. 74PCh. 21 - Prob. 75PCh. 21 - Prob. 76PCh. 21 - Prob. 77P
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- Integrated Concepts (a) What energy is dissipated by a lightning bolt having a 20,000-A current, a voltage of 1.00102 MV, and a length of 1.00 ms? (b) What mass of tree sap could be raised from 18.0°C to its boiling point and then evaporated by this energy, assuming sap has the same thermal characteristics as water?arrow_forward1. The Atmos clock(the so-called perpetual motion clock) gets its name from the fact that it runs off pressure vacations in the atmosphere, which drive a belows containing a mixture of gas and liquid ethyl chloride. Because the power to drive these clocks is so limited, they must be very efficient. In fact, a single 60.0 W lightbulb could power 240 million Atmos clocks simultaneously. Find the amount of energy, in joules, required to run an Atmos clock for one day. Explain and draws.arrow_forwardSuppose a battery operates a 2.25 W electric clock for 19.5 months. 1. What is the available energy content, in joules, of the battery? 2. How many years can a battery that supplies 7.75 × 104 J run a pocket calculator that consumes energy at the rate of 1.05 × 10-3 W?arrow_forward
- A house is heated by a 24.0-kW electric furnace. The local power company charges $0.150 per kW·h and the heating bill for January is $203. How much time (delta t) day must the furnace have been running on an average January day?arrow_forwardCompact 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?arrow_forwardCompact 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.)arrow_forward
- 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?arrow_forwardChapter 20: Problem 11: The average television set is said to be on 6 hours a day. a) Calculate the yearly cost of electricity, in billions of dollars, required to operate 100 million TVs, assuming their power consumption averages 125 W and the cost of electricity averages 10.5 cents/kW⋅h.arrow_forwardOne day on a particularly stormy night, a science student is watching the rain and thinking about all the homework they have to do. Just then a bolt of lightning discharges 21 C from one cloud to a power line. The student was able to use their iPhone to measure the potential difference to be 15,050 volts. With this data, how much energy is lost by the cloud and gained by the power line? O O a b с Od 316,050 J 442,470 J 94,815J 221,235 Jarrow_forward
- A light bulb uses up a power of 2.6 kW/hr. If the rate is Php153.42 per 1 kW/hr, and the light was on for 24 hours, a. How much kilowatt hour was consumed? b.How much was the bill after 24 hours?arrow_forwardanswer number 5arrow_forwardCASE #2: In a food factory, a production line is used to package foodcanned. The production line is made up of several machines, such as a filling machine,a labeling machine, a sealing machine, among others.The filling machine is equipped with a 5 HP three-phase electric motor and is powered by a240 V three-phase power supply. The machine is protected by an overload relaythermal switch that is configured to protect the motor against electrical overloads.One day, during the normal operation of the production line, a jam occurs in the machinefiller. As a result, the electric motor begins to draw more electrical current thannormal to try to overcome the jam. The thermal overload relay detects the increase inelectrical current and, after a certain time, activates the disconnection mechanism toprotect the engine from damage.After clearing the jam, the operator restarts the electric motor. Like overload relaythermal is still in activation state, it does not allow the engine to start, since…arrow_forward
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