1. When a Fourth Resistor Is Connected in Series with Three Resistors, the Total Resistance
1. When a fourth resistor is connected in series with three resistors, the total resistance
1. increases by one-fourth2.Increases
3. decreases4. remains the same
2. A string of five series resistors is connected across a 6 V battery. Zero voltage is measured across all resistors exceptR3. The voltage acrossR3is
1. 0 V2. 1.2 V3. 64. 0.6
3. A series circuit consists of three resistors with values of 120, 270, and 330. The total resistance is
1. less than 120
2. the average of the values
3. 7204. 120
4. A certain series circuit consists of a 1/8 W resistor, a 1/4 W resistor, and a 1/2 W resistor. The total resistance is 1200. If each resistor is operating in the circuit at its maximum power dissipation, total current flow is
1. 27 Ma 2. 2.7 mA 3.19 mA 4. 190mA
5. Which of the following series combinations dissipates the most power when connected across a 120 V source?
1. one 220resistor
2. two 220resistors
3. three 220resistors
4. four 220resistors
6. When one of three series resistors is removed from a circuit and the circuit is reconnected, the current
1. increases2. increases by one-third3. decreases by one-third
4. decreases by the amount of current through the removed resistor
7. The total power in a certain circuit is 12 W. Each of the four equal-value series resistors making up the circuit dissipates
1. 12 W2. 48W 3.3W 4. 8W
8. The following resistors (one each) are connected in a series circuit: 470, 680, 1 k, and 1.2 k. The voltage source is 20 V. Current through the 680resistor is approximately
1. 60 mA 2. 30 mA 3. 6 mA 4. 300 mA
9. A series circuit consists of a 4.7 k, a 12 k, and a 2.2 kresistor. The resistor that has the most voltage drop is
1. the 12 k2. the 2.2 k3. the 4.7 k
4. impossible to determine from the given information
10. All the voltage drops and the source voltage added together in a series circuit is equal to
1. the total of the voltage drops2. the source voltage
3. zero4. the total of the source voltage and the voltage drops
11. Two resistors are in series: a 5.6 kresistor and a 4.7 kresistor. The voltage drop across the 5.6 kresistor is 10 V. The voltage across the 4.7 kresistor is
1. 8.39 V2. 10 V3. 2.32 V4. 0 V
12. Three 680resistors are connected in series with a 470 V source. Current in the circuit is
1. 69 mA2. 230 mA3.23 mA4. 690 mA
13. There are five resistors in a given series circuit and each resistor has 6 V dropped across it. The source voltage
1. is 6 V2. depends on the current flow
3. depends on the resistor values4. is 30 V
14. If a 6 V and a 9 V source are connected series aiding, the total voltage is
1. 6 V2. 9V3.3V4. 15V
15. Five resistors are connected in a series and there is a current of 3 A into the first resistor. The amount of current into the second resistor is
1. 3 A2. 1 A3. 4 A4. 0.3 A
16. The total resistance of eight 5.6 kresistors in series is
1. 82. 5,6003.4,4804.44,800
17. A series circuit has a 24 V source and a total resistance of 120. The current through each resistor is
1. 24 mA 2. 200 mA3.120 mA4. 20 mA
18. To measure the current out of the second resistor in a circuit consisting of four resistors, an ammeter can be placed
1. between the second and third resistors
2. at the negative terminal of the source
3. between the third and fourth resistors
4. at any point in the circuit
19. A 12 V battery is connected across a series combination of 68, 47, 220, and 33. The amount of current is
1. 326 mA2. 16.3 mA3.32.6 mA4. 163 mA
20. If a 24 V and a 6 V battery aA series circuit consists of three resistors. Two resistors are 1.2 keach. The total resistance is 12 k. The value of the third resistor re series opposing, the total voltage is
1. 30 V2. 24 V3.18 V4. 0 V
21. A series circuit consists of three resistors. Two resistors are 1.2 keach. The total resistance is 12 k. The value of the third resistor
1. is 9,6002. is 9603. is 1.2 k4. cannot be determined
22. Four equal-value resistors are in series with a 12 V battery and 13.63 mA are measured. The value of each resistor is
1. 222. 2203.8804.88
23. Two 1.5 V cells are connected series opposing across two 100resistors in series. Total current flow is
1. 15 Ma2. 5 mA3.2 mA4. 0 A
24. The total resistance of a circuit is 680. The percentage of the total voltage appearing across a 47resistor that makes up part of the total series resistance is
1. 68%2. 47%3.69%4. 6.91%
25. Two 6 V batteries are connected series aiding across two 1.2 kresistors in series. Current through each resistor is
1. 5 mA2. 10 mA3.0 A4. 2.5 mA
26. An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately
1. 3852. 38.53. 3.14. 31
27. If 750 µA is flowing through 11 kof resistance, what is the voltage drop across the resistor?
1. 8.25 V2. 82.5 V3. 14.6 V4. 146 V
28. The formula to findIwhen the values ofVandRare known is
1. I = VR2. I = R/V3. V = IR4. I = V/R
29. A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?
1. 2 mA2. 2.2 mA3.214 mA4. 21.4 mA
30. Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 kof resistance?
1. 27.2 mA2. 59 mA3.5.9 mA4. 590 mA
31. How much resistance is required to limit the current from a 12 V battery to 3.6 mA?
1. 3.3 k2. 33 k3.2.2 k4. 22 k
32. What is the voltage source for a circuit carrying 2 A of current through a 36resistor?
1. 1.8 V2. 18 V3. 7.2 V4. 72 V
33. What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?
1. 9.72. 973.234.230
34. How much voltage is needed to produce 2.5 A of current through a 200resistor?
1. 50 V2. 500 V3.80 V4. 8 V
35. When there is 12 mA of current through a 1.2 kresistor, the voltage across the resistor is
1. 14.4 V2. 1.4 V3. 100 V4. 10 V
36. A resistance of 3.3 Mis connected across a 500 V source. The resulting current is approximately
1. 15.1 µA2. 151 µA3.66 mA4. 660 mA
37. You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?
1. 9 V2. 900 mV3.0 V4. 18 V
38. The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately
1. 1122. 11.23. 1.24. 18
39. If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be?
1. 8 V2. 320 V3. 3.2 V4. 32 V
40. If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is
1. 220 k2. 22 k3.2.2 k4. 220
41. Find the node voltageVA.
1. 6 V2. 12 V3. 4.25 V4. 3 V
42. What is the current throughR2?
1. 3.19 A2. 319 mA3. 1.73 A4. 173 mA
43. Find branch currentIR2.
1. 5.4 mA2. –5.4 mA3. 130.4 mA4. 119.6 mA
44. Find the node voltageVA.
1. 518 mV2. 5.18 V3. 9.56 V4. 956 mV
45. FindI2.
4I1+ 4I2= 2
6I1+ 7I2= 4
1. 1 A2. –1 A3. 100 mA4. –100 mA
46. What is the voltage drop acrossR1?
1. 850 mV2. 8.5 V3. 9.18 V4. 918 mV
47. What is the voltage drop acrossR2?
1. 3.5 V2. 4.18 V3. 1.5 V4. 145 mV
48. In assigning the direction of branch currents,
1. the directions are critical2. the directions are not critical
3. they must point into a node4. they must point out of a node
49. Referring to Problem 10, find branch currentIR3.
1. 5.4 mA2. –5.4 mA3. 67.8 mA4. –67.8 mA
50. FindI1.
4I1+ 4I2= 2
6I1+ 7I2= 4
1. 0.5 A2. 50 mA3.–0.5 A4. –50 mA
51. The internal resistance of a 20,000 ohm/volt voltmeter set on its 5 V range is
1. 20,0002. 100,0003.200,0004.1,000,000
52. Two 1.2 kresistors are in series and this series combination is in parallel with a 3.3 kresistor. The total resistance is
1. 1382. 1,3893.5,7004.880
53. The output of a certain voltage divider is 12 V with no load. When a load is connected, the output voltage
1. decreases2. Increases3.remains the same4. becomes zero
54. A certain voltage divider consists of two 12 kresistors in series. Which of the following load resistors will have the most effect on the output voltage?
1. 1 M2.24 k18 k4. 12 k
55. A voltage divider consists of two 68 kresistors and a 24 V source. The unknown output voltage is
1. 12 V2. 24 V3.0 V4. 6 V
56. Three 10 kresistors are connected in series. A 20 kresistor is connected in parallel across one of the 10 kresistors. The voltage source is 24 V. The total current in the circuit is
1. 900A2. 9 Ma3.90 mA4. 800A
57. A certain voltage divider consists of three 1 kresistors in series. Which of the following load resistors will have the least effect on the output voltage?
1. 1 M2.100 k3.1 k4. 330
58. The parallel combination of a 470resistor and a 1.5 kresistor is in series with the parallel combination of five 1 kresistors. The source voltage is 50 V. The percentage of the load current through any single 1 kresistor is
1. 25%2. 20%3.100%4. 50%
59. A certain Wheatstone bridge has the following resistor values:R1= 10 k,R2= 720, andR4= 2.4 k. The unknown resistance is
1. 242. 2.43. 3004.3,000
60. On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
1. 1 V2. 50 V3.500 v4.1000 v
61.Filament lamp makes use of
1) Chemical effect2) heating effect
3) Magnetic effect4) none of these
62. A terminal where more than two branches meet is known as
1) Node2) terminus
3) Anode4) none of these
63. I kWh is equal to
1) 860Kcal2) 36 × 105 ergs
3) Both (1) and (2) above4) none of these
64. Lamps in street lighting are all connected in
1) Series2) parallel
3) series-parallel4) end-to-end
65. Thermo-couple is based on
1) See back-effect2) Thomson
3) Joule’s4) none of these
66. Peak factor is the ratio of
1) Average value to rms value
2) rms value to average value
3) Peak value to average value4) peak value to rms value
67. Resistors
1) Oppose suddent changes in voltages
2) Can act as energy storage devices
3) Can dissipate desirable amount of power
4) None o these
68. Power factor of an ac circuit is defined as the ratio of
1) Resistance and reactance
2) Resistance and impedance
3) Reactance and impedance
4) Reactance and resistance
69. Force experienced by a current carrying conductor lying parallel to a magnetic field is
1) B.I.I2) zero
3) H.I.I4)
70. Magnetic flux density B due to a conductor carrying current I at a point distant r from the conductor is
1) 2)
3) 4)
71. if two series inductors L1 and L2 have additive mutual inductance M, the total inductance of the two coils equals
1) L1 + L22) L1 + L2 + M
3) L1 + L2 – 2M4) L1 + L2 + 2M
72. If two series inductors L1 and L2 in parallel have additive mutual inductance M, then the total effective inductance of the coils equals
1) 2) + 2M
3) 4)
73. Energy stored in the magnetic fields of inductor L carrying current is
1) LI22) LI2
3) 2 LI24) LI
74. A dc supply V volts is connected to a series RL circuit at time t=0. The rate of current at t=0 is
1) 02)
3) 4) et/
75. if two series inductors L1 and L2 have subtractive mutual inductance M, the total inductance of the two coils equals
1) L1 + L22) L1 + L2 + M
3) L1 + L2 – 2M4) L1 + L2 + 2M
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