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1 ch 18 practice Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of the following is the best description of a schematic diagram? a. uses pictures to represent the parts of a circuit determines the location of the parts of a circuit c. shows the parts of a circuit and how the parts connect to each other shows some of the parts that make up a circuit 2. What happens when the switch is closed in the circuit shown above? a. The lamp lights because current from the battery flows through the lamp. Current from the battery is carried through the resistor. c. Current from the battery is carried through both the lamp and the resistor. The lamp goes out, because the battery terminals connect to each other. 3. A circuit has a continuous path through which charge can flow from a voltage source to a device that uses electrical energy. What is the name of this type of circuit? a. a short circuit a closed circuit c. an open circuit a circuit schematic 4. If the potential difference across the bulb in a camping lantern is 9.0 V, what is the potential difference across the battery used to power it? a. 1.0 V 3.0 V 18 V 5. If the potential difference across a pair of batteries used to power a flashlight is 6.0 V, what is the potential difference across the flashlight bulb? 6.0 V 12 V 6. If the batteries in a portable CD player provide a terminal voltage of 12 V, what is the potential difference across the entire CD player? 4.0 V c. 6.0 V 12 V 7. How does the potential difference across the bulb in a flashlight compare with the terminal voltage of the batteries used to power the flashlight? a. The potential difference is greater than the terminal The potential difference is less than the terminal c. The potential difference is equal to the terminal It cannot be determined unless the internal resistance of the batteries is known. 8. If a 9.0 V battery is connected to a lightbulb, what is the potential difference across the bulb? 4.5 V 18 V 9. Which of the following statements about a battery as a source of electric current is not true? a. A battery is a source of emf. A battery provides the energy that moves charge. c. The terminal voltage of a battery is equal to its emf. The terminal voltage of a battery is the voltage it delivers to the loa 10. Three resistors with values of 4.0, 6.0, and 8.0, a c Three resistors connected in series carry currents labeled I, I, and I, respectively. Which of the following expresses the total current, I, in the system made up of the three resistors in series?

2 a. I 1 + I 2 + I 3 c. I 1 = I 2 = I Three resistors connected in series have potential differences across them labeled V, V, and V. Which of the following expresses the potential difference taken over the three resistors together? a. V 1 + V 2 + V 3 c. V 1 = V 2 = V Three resistors with values of R, R, and R are connected in series. Which of the following expresses the total resistance, R, of the three resistors? a. R 1 + R 2 + R 3 c. R 1 = R 2 = R A circuit is composed of resistors wired in series. What is the relationship between the equivalent resistance of the circuit and the resistance of the individual resistors? a. The equivalent resistance is equal to the largest resistance in the circuit. The equivalent resistance is greater than the sum of all the resistances in the circuit. c. The equivalent resistance is equal to the sum of the individual resistances. The equivalent resistance is less than the smallest resistance in the circuit. 15. Three resistors with values of 3.0, 6.0, and 12 are connected in series. What is the equivalent resistance of this combination? a c Three resistors connected in parallel carry currents labeled I, I, and I. Which of the following expresses the total current I in the combined system? a. I 1 + I 2 + I 3 c. I 1 = I 2 = I Three resistors connected in parallel have potential differences across them labeled V, V, and V. Which of the following expresses the potential difference across all three resistors? a. V 1 + V 2 + V 3 c. V 1 = V 2 = V Three resistors with values of R, R, and R are connected in parallel. Which of the following expresses the total resistance, R, of the three resistors? a. R 1 + R 2 + R 3 c. R 1 = R 2 = R Two resistors having the same resistance value are wired in parallel. How does the equivalent resistance compare to the resistance value of a single resistor? a. The equivalent resistance is twice the value of a The equivalent resistance is the same as a single resistor. c. The equivalent resistance is half the value of a The equivalent resistance is greater than that of a 20. Three resistors with values of 4.0, 6.0, and 10.0 are connected in parallel. What is their equivalent resistance? a c. 6.0

3 Three resistors with values of 3.0, 6.0, and 12 are connected in parallel. What is the equivalent resistance of this combination? a c The equivalent resistance of a complex circuit is usually determined by a. inspection. simplifying the circuit into groups of series and parallel circuits. c. adding and subtracting individual resistances. dividing the sum of the individual resistances by the number of resistances. 23. To find the current in a complex circuit, it is necessary to know the a. potential difference in each device in the circuit. current in each device in the circuit. c. equivalent resistance of the circuit. number of branches in the circuit. 24. What is the equivalent resistance of the resistors in the figure shown above? a c Two resistors with values of 6.0 and 12 are connected in parallel. This combination is connected in series with a 4.0 resistor. What is the equivalent resistance of this combination? a c What is the equivalent resistance for the resistors in the figure shown above? a. 25 c

4 27. What is the equivalent resistance for the resistors in the figure shown above? a. 1.3 c Three resistors connected in parallel have individual values of 4.0, 6.0, and 10.0, as shown above. If this combination is connected in series with a 12.0 V battery and a 2.0 resistor, what is the current in the 10.0 resistor? a A 1.0 A c. 11 A 16 A 29. Two resistors with values of 6.0 and 12 are connected in parallel. This combination is connected in series with a 2.0 resistor and a 24 V battery. What is the current in the 2.0 resistor? Problem 31. Three resistors with values of 29, 56, 24, 32. Three resistors with values of 69, 176, 98, 33. A current of 0.12 A passes through a 5.1 resistor. The resistor is connected in series with a 9.1 V battery and an unknown resistor. What is the resistance value of the unknown resistor? a. 2.0 A 4.0 A c. 6.0 A 12 A 30. In any complex resistance circuit, the voltage across any resistor in the circuit is always a. less than the voltage source. equal to or less than the voltage source. c. equal to the voltage source. greater than the voltage source. 34. Three resistors are wired in series with a 28.5 V battery. The resistances are 21.2, 37.6, and 6.1. What is the voltage across the 6.1 resistor? 35. Three resistors with values of 23, 89, 19, respectively, are connected in parallel. What is their 36. Three resistors with values of 4.8, 5.3, 12.7, respectively, are connected in parallel. What is their

5 37. How much current is in one of the 10 resistors in the diagram shown above? 38. Two resistors having values of 4.1 and 5.8 are wired in parallel. This pair of resistors is wired in series with a second pair of parallel resistors having values of 4.7 and 5.9. If the current in the 5.8 resistor is 0.35 A, what is the voltage across the entire circuit?

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