Physical Science (12th Edition), Standalone Book
12th Edition
ISBN: 9781260150544
Author: Bill W. Tillery
Publisher: McGraw Hill Education
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Textbook Question
Chapter 6, Problem 11PEB
An electric motor draws a current of 11.5 A in a 240 V circuit. What is the power of this motor in W?
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Chapter 6 Solutions
Physical Science (12th Edition), Standalone Book
Ch. 6 - 1. Electrostatic charge results from
a. transfer...Ch. 6 - 2. The unit of electric charge is the
a. volt.
b....Ch. 6 - 3. An electric field describes the condition of...Ch. 6 - 4. A material that has electrons that are free to...Ch. 6 - 5. An example of an electrical insulator is
a....Ch. 6 - 6. The electrical potential difference between two...Ch. 6 - 7. The rate at which an electric current flows...Ch. 6 - 8. The law that predicts the behavior of...Ch. 6 - 9. What type of electric current is produced by...Ch. 6 - 10. The electrical resistance of a conductor is...
Ch. 6 - 11. According to Ohm’s law, what must be greater...Ch. 6 - 12. A kilowatt-hour is a unit of
a. power.
b....Ch. 6 - 13. If you multiply volts by amps, the answer will...Ch. 6 - 14. Units of joules per second are a measure...Ch. 6 - 15. A lodestone is a natural magnet that...Ch. 6 - The north pole of a suspended or floating bar...Ch. 6 - 17. A current-carrying wire always has
a. a...Ch. 6 - 18. Magnetism is produced by
a. an excess of north...Ch. 6 - 19. Earth's magnetic field
a. has undergone many...Ch. 6 - 20. The strength of a magnetic field around a...Ch. 6 - 21. Reverse the direction of a current in a wire,...Ch. 6 - 22. The operation of which of the following...Ch. 6 - Prob. 23ACCh. 6 - When a loop of wire cuts across magnetic field...Ch. 6 - 25. A step-up transformer steps up the
a....Ch. 6 - Prob. 26ACCh. 6 - 27. Electric power companies step up the voltage...Ch. 6 - 28. A solar cell
a. produces electricity...Ch. 6 - 29. Which of the following is most likely to...Ch. 6 - 30. Which of the following units are measures of...Ch. 6 - 31. You are using which description of a current...Ch. 6 - 32. In an electric current, the electrons are...Ch. 6 - 33. In which of the following currents is there no...Ch. 6 - Prob. 34ACCh. 6 - 35. A permanent magnet has magnetic properties...Ch. 6 - 36. A current-carrying wire has a magnetic field...Ch. 6 - 37. When an object acquires a negative charge, it...Ch. 6 - 38. A positive and a negative charge are initially...Ch. 6 - 39. To be operational, a complete electric circuit...Ch. 6 - 40. Which variable is inversely proportional to...Ch. 6 - 41. Which of the following is not considered to...Ch. 6 - 42. A piece of iron can be magnetized or...Ch. 6 - 43. Earth’s magnetic field is believed to...Ch. 6 - 44. Electromagnetic induction takes place...Ch. 6 - 45. The current in the secondary coil of a...Ch. 6 - 46. An electromagnet uses.
a. a magnetic field to...Ch. 6 - 47. A transformer.
a. changes the voltage of a...Ch. 6 - 48. A parallel circuit has
a. wires that are lined...Ch. 6 - 49. In which type of circuit would you expect a...Ch. 6 - 50. In which type of circuit would you expect the...Ch. 6 - 1. Explain why a balloon that has been rubbed...Ch. 6 - 2. Explain what is happening when you walk across...Ch. 6 - 3. Why does a positively or negatively charged...Ch. 6 - 4. Explain how you that it is an electric field,...Ch. 6 - 5. Is a kWh a unit of power or a unit of work?...Ch. 6 - 6. What is the difference between ac and dc?
Ch. 6 - Prob. 7QFTCh. 6 - 8. How is an unmagnetized piece of iron different...Ch. 6 - 9. Explain why the electric utility company...Ch. 6 - 10. Describe how an electric generator is able to...Ch. 6 - Prob. 11QFTCh. 6 - 12. Explain what causes an electron to move toward...Ch. 6 - 1. Explain how the model of electricity as...Ch. 6 - 2. What are the significant similarities and...Ch. 6 - 3. Transformers usually have signs warning,...Ch. 6 - 4. Will a fuel cell be the automobile engine of...Ch. 6 - 5. Analyze the apparent contradiction in the...Ch. 6 - 6. What are the basic similarities and differences...Ch. 6 - 7. What are the advantages and disadvantages of...Ch. 6 - A rubber balloon has become negatively charged...Ch. 6 - Prob. 2PEACh. 6 - Prob. 3PEACh. 6 - Prob. 4PEACh. 6 - Prob. 5PEACh. 6 - Prob. 6PEACh. 6 - Prob. 7PEACh. 6 - Prob. 8PEACh. 6 - Prob. 9PEACh. 6 - Prob. 10PEACh. 6 - Prob. 11PEACh. 6 - Prob. 12PEACh. 6 - Prob. 13PEACh. 6 - Prob. 14PEACh. 6 - Prob. 15PEACh. 6 - Prob. 16PEACh. 6 - Prob. 17PEACh. 6 - 1. An inflated rubber balloon is rubbed with a...Ch. 6 - 2. What is the force between two balloons with a...Ch. 6 - 3. How much energy is available from a 12 V...Ch. 6 - 4. A wire carries a current of 2.0 A. at what rate...Ch. 6 - Prob. 5PEBCh. 6 - 6. There is a current of 0.83 A through a...Ch. 6 - 7. What is the voltage across a 60.0 resistor with...Ch. 6 - 7. What is the voltage across a 60.0 resistor...Ch. 6 - 9. A lightbulb designed to operate in a 120.0 V...Ch. 6 - 10. What is the monthly energy cost of leaving a...Ch. 6 - 11. An electric motor draws a current of 11.5 A in...Ch. 6 - 12. A swimming pool requiring a 2.0 hp motor to...Ch. 6 - 13. Is it possible for two people to...Ch. 6 - 14. A step-up transformer has a primary coil with...Ch. 6 - 15. The step-down transformer in a local...Ch. 6 - 16. A step-down transformer connected to a 120 V...Ch. 6 - 17. What is the power of an 8.0-ohm bulb when...
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- Integrated Concepts (a) Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 750-kg electric car be able to supply: (a) To accelerate from rest to 25.0 m/s in 1.00 min? (b) To climb a 2.00 102-m- high hill in 2.00 min at a constant 25.0-m/s speed while exerting 5.00 102 N of force to overcome air resistance and friction? (c) To travel at a constant 25.0-m/s speed, exerting a 5.00 102 N force to overcome air resistance and friction? See Figure 20.44.arrow_forwardThree identical 60.0-W, 120-V lightbulbs are connected across a 120-V power source as shown in Figure P28.72. Assuming the resistance of each lightbulb is constant (even though in reality the resistance might increase markedly with current), find (a) the total power supplied by the power source and (b) the potential difference across each lightbulb.arrow_forwardA 165F capacitor is used in conjunction with a dc motor. How much energy is stored in it when 119 V is applied?arrow_forward
- A 120.-V motor has mechanical power output of 2.50 hp. It is 90.0% efficient in converting power that it takes in by electrical transmission into mechanical power. (a) Find the current in the motor. (b) Find the energy delivered to the motor by electrical transmission in 3.00 h of operation. (c) If the electric company charges 0.110/kWh, what does it cost to run the motor for 3.00 h?arrow_forwardIntegrated Concepts (a) An immersion heater utilizing 120 V can raise the temperature of a 1.00 102 -g aluminum cup containing 350 g of water from 20.0°C to 95.0°C in 2.00 min. Find its resistance, assuming it is constant during the process. (b) A lower resistance would shorten the heating time. Discuss the practical limits to speeding the heating by lowering the resistance.arrow_forwardThe power dissipated by a resistor with a resistance of R=100 is P = 2.0 W . What are the current through and the voltage drop across the resistor?arrow_forward
- (a) How much power is dissipated in a short circuit of 240-V ac through a resistance of 0.250 ? (b) What current flows?arrow_forwardIf electrical energy costs 0.12 per kilowatt-hour, how much does it cost to (a) burn a 100-W lightbulb for 24 h? (b) Operate an electric oven for 5.0 h if it carries a current of 20.0 A at 220 V?arrow_forwardFor the circuit shown in Figure P28.55. the ideal voltmeter reads 6.00 V and the ideal ammeter reads 3.00-k. Find (a) the value of K, (b) the emf of the battery, and (c) the voltage across the 3.00-kft resistor.arrow_forward
- A 120-V immersion heater consists of a coil of wire that is placed in a cup to boil the water. The heater can boil one cup of 20.00°C water in 180.00 seconds. You buy one to use in your dorm room, but you are worried that you will overload the circuit and nip the 15.00-A, 120-V circuit breaker, which supplies your dorm room. In your dorm room, you have four 100.00-W incandescent lamps and a 1500.00-W space heater, (a) What is the power rating of the immersion heater? (b) Will it trip the breaker when everything is turned on? (c) If it you replace the incandescent bulbs with 18.00-W LED, will the breaker nip when everything is turned on?arrow_forwardA battery with an internal resistance of 10.0 produces an open circuit voltage of 12.0 V. A variable load resistance with a range from 0 to 30.0 is connected across the battery. (Note: A battery has a resistance that depends on the condition of its chemicals and that increases as the battery ages. This internal resistance can be represented in a simple circuit diagram as a resistor in series with the battery.) (a) Graph the power dissipated in the load resistor as a function of the load resistance. (b) With your graph, demonstrate the following important theorem: The power delivered to a load is a maximum if the load resistance equals the internal resistance of the source.arrow_forward(a) Haw much power is dissipated in a short circuit of 240-V AC through a resistance of 0.250 ? (b) What current flows?arrow_forward
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