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1 Name: Figure 1 Base your answer to the question on the information below and on your knowledge of physics. A student constructed a series circuit consisting of a 12.0-volt battery, a 10.0-ohm lamp, and a resistor. The circuit does not contain a voltmeter or an ammeter. When the circuit is operating, the total current through the circuit is 0.50 ampere. 1. [Refer to figure 1] Calculate the power consumed by the lamp. [Show all work, including the equation and substitution with the units.] 5. Which circuit below would have the lowest voltmeter reading? A. C. 2. An operating 75-watt lamp is connected to a 120-volt outlet. How much electrical energy is used by the lamp in 60. minutes (3600 seconds)? A J B J C J D J 3. A clothes dryer connected to a 240-volt line draws 30. amperes of current for 20. minutes (1,200 seconds). Approximately how much electrical energy is consumed by the dryer? B. D. A J B J C J D J 6. Which circuit segment has an equivalent resistance of 6 ohms? A. C. 4. Which statement about ammeters and voltmeters is correct? A. The internal resistance of both meters should be low. B. Both meters should have a negligible effect on the circuit being measured. C. The potential drop across both meters should be made as large as possible. D. The scale range on both meters must be the same. B. D.
2 7. In the circuit shown in the diagram below, which is the correct reading for meter V 2? 11. The diagram below represents an electric circuit. A. 20 V B. 70 V C. 90 V D. 110 V 8. A 10.-ohm resistor and a 20.-ohm resistor are connected in series to a voltage source. When the current through the 10.- ohm resistor is 2.0 amperes, what is the current through the 20.- ohm resistor? A. 1.0 A B. 2.0 A C A D. 4.0 A 9. A toaster dissipates 1500 watts of power in 90. seconds. The amount of electric energy used by the toaster is approximately A J B J C J D J 10. In the diagram below, lamps L 1 and L 2 are connected to a constant voltage power supply. The total amount of energy delivered to the resistor in 10. seconds is 12. A. 3.2 J B. 5.0 J C. 20. J D. 320 J The slope of the line on the graph represents A. resistance of a material B. electric field intensity C. power dissipated in a resistor D. electrical energy 13. In the circuit shown in the diagram below, what is the potential difference of the source? If lamp L 1 burns out, the brightness of L 2 will A. decrease B. increase C. remain the same A. 3.3 V B. 10. V C. 30. V D. 1,000 V
3 14. An electric motor uses 15 amperes of current in a 440-volt circuit to raise an elevator weighing 11,000 newtons. What is the average speed attained by the elevator? A m/s B m/s C. 27 m/s D m/s 17. The diagram below shows a circuit with three resistors. 15. A lamp and an ammeter are connected to a source as shown in the diagram. What is the resistance of resistor R 3? A. 6.0 Ω B. 2.0 Ω C. 12 Ω D. 4.0 Ω What is the electrical energy expended in the lamp in 3.0 seconds? A. 50. J B. 150 J C. 50. W D. 150 W 18. An electric iron draws a current of 5 amperes and has a resistance of 20 ohms. The amount of energy used by the iron in 40 seconds is A. 100 J B. 500 J C. 4,000 J D. 20,000 J 19. In the circuit shown below, voltmeter V 2 reads 80. volts. 16. Three ammeters are placed in a circuit as shown in the diagram below. If A 1 reads 5.0 amperes and A 2 reads 2.0 amperes, what does A 3 read? A. 1.0 A B. 2.0 A C. 3.0 A D. 7.0 A What is the reading of voltmeter V 1? A. 160 V B. 80. V C. 40. V D. 20. V
4 20. The diagram below represents a sample electric circuit. 25. In which pair of circuits shown in the diagram below could the readings of voltmeters V 1 and V 2 and ammeter A be correct? How much charge passes through the resistor in 2.0 seconds? A. 6.0 C B. 2.0 C C. 8.0 C D. 4.0 C 21. In the diagram below, what is the potential difference across the 3.0-ohm resistor? A. A and B B. B and C C. C and D D. A and D 26. A 5-ohm and a 10-ohm resistor are connected in series. The current in the 5-ohm resistor is 2 amperes. The current in the 10- ohm resistor is A. 1 A B. 2 A C. 0.5 A D. 8 A A. 1.0 V B. 2.0 V C. 3.0 V D. 1.5 V 27. Two resistors are connected to a source of voltage as shown in the diagram. 22. If the power developed in an electric circuit is doubled, the energy used in one second is A. quartered B. doubled C. halved D. quadrupled 23. If the potential drop across an operating 300.-watt floodlight is 120 volts, what is the current through the floodlight? A A B. 2.5 A C. 7.5 A D. 4.8 A At which position should an ammeter be placed to measure the current passing only through resistor R 1? A. position 1 B. position 2 C. position 3 D. position A light bulb operating at 120 volts draws a current of 0.50 ampere for 240 seconds. The power rating of the light bulb is A. 30. W B. 60. W C. 75 W D. 120 W
5 Figure 2 Base your answer to the question on the information and circuit diagram below and on your knowledge of physics. Three lamps are connected in parallel to a 120.-volt source of potential difference, as represented below. 28. [Refer to figure 2] Calculate the resistance of the 40.-watt lamp. [Show all work, including the equation and substitution with units.] 31. An operating lamp draws a current of 0.50 ampere. The amount of charge passing through the lamp in 10. seconds is A C B. 2.0 C C. 5.0 C D. 20. C 29. Which is a unit of electrical power? A. volt/ampere B. ampere/ohm C. ampere 2 /ohm D. volt 2 /ohm 30. A 30.-ohm resistor and a 60.-ohm resistor are connected in an electric circuit as shown below. Compared to the electric current through the 30.-ohm resistor, the electric current through the 60.-ohm resistor is A. smaller B. larger C. the same
6 Figure 3 Base your answer to the question on the information below. A 15-ohm resistor and a 20.-ohm resistor are connected in parallel with a 9.0-volt battery. A single ammeter is connected to measure the total current of the circuit. 32. [Refer to figure 3] 33. The diagram shows a circuit with two resistors. Draw a diagram of this circuit using symbols from the table below. Compared to the potential drop across the 8-ohm resistor, the potential drop across the 4-ohm resistor is A. the same B. twice as great C. one-half as great D. four times as great 34. [Refer to figure 1] In the space below, draw a diagram of the series circuit constructed to operate the lamp, using symbols from the Reference Tables for Physical Setting/Physics. [Assume the availability of any number of wires of negligible resistance.] 35. Which circuit could be used to determine the total current and potential difference of a parallel circuit? A. C. B. D.
7 36. The diagram represents a series circuit containing three resistors. 37. An electric circuit contains an operating heat element and a lit lamp. Which statement best explains why the lamp remains lit when the heating element is removed from the circuit? A. The lamp has less resistance than the heating element. B. The lamp has more resistance than the heating element. C. The lamp and the heating element were connected in series. D. The lamp and the heating element were connected in parallel. What is the current through resistor R 2? A. 1.0 A B A C. 3.0 A D. 9.0 A
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