1) 10. V 2) 20. V 3) 110 V 4) 220 V


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1 1. The diagram below represents an electric circuit consisting of a 12volt battery, a 3.0ohm resistor, R 1, and a variable resistor, R What is the total resistance of the circuit 1) 6.6 Ω 2) 10 Ω 3) 20 Ω 4) 30 Ω At what value must the variable resistor be set to produce a current of 1.0 ampere through R 1 1) 6.0 Þ 2) 9.0 Þ 3) 3.0 Þ 4) 12 Þ 4. Three resistors of 20. ohms, 30. ohms, and 60. ohms, respectively, are connected in series with a battery. A current of 2.0 amperes will flow through this circuit when the potential difference of the battery is 1) 10. V 2) 20. V 3) 110 V 4) 220 V Base your answers to questions 2 and 3 on the diagram below. 5. The diagram below represents a series circuit containing three resistors. 2. Compared to the current in R 1, the current in R 2 is 1) less 2) greater 3) the same What is the current through resistor R 2 1) 1.0 A 2) 0.33 A 3) 3.0 A 4) 9.0 A
2 6. The diagram below shows three resistors, R 1, R 2, and R 3, connected to a 12volt battery. Base your answers to questions 8 through 10 on the diagram below. The reading of voltmeter V 1 is 26 volts, and the reading of ammeter A 1 is 2 amperes. If voltmeter V 1 reads 3 volts and voltmeter V 2 reads 4 volts, what is the potential drop across resistor R 3 1) 12 V 2) 5 V 3) 0 V 4) 4 V 7. Base your answer to the following question on the circuit diagram below. 8. If additional resistances are added in series and the applied voltage is kept constant, the reading of voltmeter V 3 will 1) decrease 2) increase 3) remain the same 9. What is the total resistance of the circuit 1) 3/4 Ω 2) 4/3 Ω 3) 10 Ω 4) 13 Ω 10. What is the reading of voltmeter V 2 The current through R 1 will be 1) less than 2 amperes 2) 2 amperes 3) more than 4 amperes 1) 52 V 2) 26 V 3) 13 V 4) 8 V 4) 4 amperes
3 11. A 6.0ohm lamp requires 0.25 ampere of current to operate. In which circuit below would the lamp operate correctly when switch S is closed 1) 13. A 5ohm and a 10ohm resistor are connected in series. The current in the 5ohm resistor is 2 amperes. The current in the 10ohm resistor is 1) 1 A 2) 2 A 3) 0.5 A 2) 4) 8 A 14. A student needs a 4ohm resistor to complete a circuit. Only a large quantity of 1ohm resistors are available. Which of the following should be done to complete the circuit 3) 1) Connect four 1ohm resistors in series. 2) Connect four 1ohm resistors in parallel. 3) Connect two of the 1ohm resistors in series and two in parallel. 4) 4) Connect only two 1ohm resistors in parallel. 15. The diagram below represents an electric circuit. 12. In the circuit shown below, how many coulombs of charge will pass through resistor R in 2.0 seconds If the voltage between A and B is 10 volts, the voltage between B and C is 1) 5 V 1) 36 C 2) 6.0 C 3) 3.0 C 2) 10 V 3) 15 V 4) 20 V 4) 4.0 C
4 16. Two resistors are connected to a source of voltage as shown in the diagram below. 18. What quantities may be directly measured by the arrangement of meters shown in the diagram below At which position should an ammeter be placed to measure the current passing only through resistor R 1 1) 1 2) 2 3) 3 4) Compared to the resistance of the circuit being measured, the internal resistance of a voltmeter is designed to be very high so that the meter will draw 1) voltage drop across R 2 and current through R 2 2) current through R 1 and R 2 3) current through R 1 and voltage drop across R 2 4) the resistance of R l and R Base your answer to the following question on the diagram below which represents two resistances (R 1 and R 2 ) and an ammeter connected to a constant 30. volt source. The combined resistance of the circuit is 6.0 ohms. 1) no current from the circuit 2) little current from the circuit 3) most of the current from the circuit 4) all the current from the circuit If the resistance of R 2 were increased, the current through R 2 would 1) decrease 2) increase 3) remain the same
5 20. Which diagram shows correct current direction in a segment of an electric circuit 1) 2) 3) 4) 21. The diagram to the right represents a segment of a circuit. The current in wire X may be 23. The magnitude of the current in ammeter A 1 is 1) 120 A 2) 2.0 A 3) 1.2 A 4) 0.83 A 1) 1 A 2) 2 A 24. Base your answer to the following question on the diagram below. 3) 3 A 4) 4 A Base your answers to questions 22 and 23 on the diagram below which represents an electrical circuit. If a third resistance is added in parallel to the 24volt source, the combined resistance of the circuit will 1) decrease 2) increase 22. Compared to the current in A 1, the current in A 2 is 3) remain the same 1) less 2) greater 3) the same
6 25. The diagram below shows electric currents in conductors that meet at junction P. 27. The current in R 1 is 1) 0.83 A 2) 1.5 A 3) 3.0 A 4) 1.2 A What are the magnitude and direction of the current in conductor PQ 28. Base your answer to the following question on the diagram below which represents an electrical circuit. 1) 9 A toward P 2) 9 A toward Q 3) 5 A toward P 4) 5 A toward Q Base your answers to questions 26 and 27 on the diagram below which represents three resistors connected in parallel across a 24 volt source. The ammeter reads 3.0 amperes. The equivalent resistance of R 1, R 2, and R 3 is approximately 1) 10 Ω 2) 2 Ω 3) 20 Ω 4) 7 Ω 29. The total resistance of several resistors connected in parallel is 26. The equivalent resistance in the circuit is 1) 0.13 Ω 2) 8.0 Ω 3) 58 Ω 1) equal to the sum of the separate resistances 2) equal to the largest resistance 3) smaller than the smallest resistance 4) greater than the largest resistance 4) 72 Ω
7 30. Base your answer to the following question on the diagram below, which represents an electric circuit consisting of four resistors and a 12 volt battery. What is the equivalent resistance of this circuit 1) 72 Þ 2) 18 Þ 3) 3.0 Þ 4) 0.33 Þ 31. If a 15ohm resistor is connected in parallel with a 30.ohm resistor, the equivalent resistance is 1) 15 ohm 32. Base your answer to the following question on the diagram below, which shows two resistors and three ammeters connected to a voltage source. 2) 2.0 ohm 3) 10. ohm 4) 45 ohm What is the current reading of ammeter A 1 1) 10.0 A 2) 6.0 A 3) 3.0 A 4) 4.0 A
8 33. A physics student is given three 12ohm resistors with instructions to create the circuit that would have the lowest possible resistance. The correct circuit would be a 36. Base your answer to the following question on the diagram of the circuit below. 1) series circuit with an equivalent resistance of 36 Þ 2) series circuit with an equivalent resistance of 4.0 Þ 3) parallel circuit with an equivalent resistance of 36 Þ 4) parallel circuit with an equivalent resistance of 4.0 Þ Base your answers to questions 34 and 35 on the electric circuit below. The switch is in the open position. If resistance R 2 were removed, the current in ammeter A would 1) decrease 2) increase 3) remain the same 37. Base your answer to the following question on the diagram below. 34. Compared to the current passing through ammeter A 1 when the switch is open, the current passing through ammeter A 1 when the switch is closed will be 1) less 2) greater 3) the same 35. What is the reading of ammeter A 1 1) 1/6 ampere 2) 6.0 amperes 3) 60. amperes 4) 600 amperes The total resistance in the circuit is 1) 9 Ω 2) 6 Ω 3) 3 Ω 4) less than 3 Ω
9 38. Which circuit segment below has the same total resistance as the circuit segment shown in the diagram to the right 1) 2) 3) 4)
10 Answer Key
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