Questions Bank of Electrical Circuits 1. If a 100 resistor and a 60 XL are in series with a 115V applied voltage, what is the circuit impedance? 2. A 50 XC and a 60 resistance are in series across a 110V source, Calculate the impedance. 3. Find the impedance of a series R-C-L circuit, when R = 6, XL = 20, and XC = 10 4. A 200 resistor, a 100 XL, and an 80 XC are placed in parallel across a 120V AC source (Figure 10). Find: (1) the branch currents, (2) the total current, and (3) the impedance. 5. A 200 resistor and a 50 XL are placed in series with a voltage source, and the total current flow is 2 amps. Find: 1. Pf 2. applied voltage, V 3. P 4. Q 5. S 6. A 600 resistor and 200 XL in Parallel R-L Circuit 200 XL are in parallel with a 440V source Find: 1. IT 2. Pf 3. P 4. Q 5. S 7. An 80 Xc and a 60 resistance are in series with a 120V source, Find: 1. Z 2. IT 3. Pf 4. P 5. Q 6. S. 8. A 30 resistance and 40 XC are in parallel with a 120V power source, as shown in Figure 7. Find: 1. IT 2. Z 3. Pf 4. P 5. Q6. S. 9. An 800 resistance, 100 XL, and an 80 XC are in parallel with a 120V, 60Hz source, Find: 1. IT 2. Pf 3. P 4. Q 5. S 10. Calculate the power dissipated when a current of 4 ma flows through a resistance of 5 k 11. The hot resistance of a 240 V filament lamp is 960. Find the current taken by the lamp and its power rating. 12. Find the equivalent resistance for the circuit shown in Figure. 13. For the series-parallel arrangement shown in Figure, find (a) the supply current, (b) the current flowing through each resistor and (c) the voltage across each resistor.
14. For the circuit shown in Figure calculate (a) the value of resistor Rx such that the total power dissipated in the circuit is 2.5 kw, and (b) the current flowing in each of the four resistors. 15. For the arrangement shown in Figure, find the current Ix 16. Find the current and voltages in each branch in the circuit shown in figure 50Ω 100 v 20Ω 30Ω 30Ω 17. Find V1 and V2 shown in the circuit that shown in figure 40Ω 100 v v1 v2 18. Find Req in the circuit that shown in figure
100Ω 100Ω Req 200Ω 100Ω 150Ω 150Ω 200Ω 100Ω 200Ω 19. Find the value of current ia using Mesh Analysis in the circuit shown in figure 25Ω 5Ω 4.8A 30Ω ia 0.5 ia 5Ω 20. Find the current through 9ohm in the circuit that shown in figure 8Ω 3kΩ 8A 1 9Ω 4Ω 5 v 21. What the value of resistance should be connected between terminal AB to draw a maximum power in the circuit that shown in figure 5vx 1Ω 1Ω + - +vx- A B 4Ω 9 v 22. Using Nodal Analysis find the voltages value in each branch that shown in figure 4A 4Ω 28 v 25A
23. Find Req in the circuit then find the total current that shown in figure 5Ω 1Ω 10 v 4Ω 24. Use superposition theorem to find the current that shown in figure 12 v DC 1Ω 2A + - 5 vx 25. Determine Thevenin voltage and Rth at the terminal AB for the network that shown in figure I 4A 12A 1 4Ω 3A A B 26. Find the current through 9 ohm using Thevenin in the circuit that shown in figure 12 v 4Ω 0.2vx 6Ω vx 9Ω 27. Find R.M.S, Average and k-factor value for the shape that shown in figure
28. Find the RMS value, Average value, form factor and peak factor of the wave shown in figure 29. Find the value of RX which consume maximum power, then find P max in figure 30Ω 4Ω 400 v 15Ω RX
30. find the value of current in the branch BE of the network shown in figure using mesh (Maxwell) analysis. 31. find the current in (7Ω) in the circuit shown in figure using Norton Method. 8Ω 4Ω 300 v 1 7Ω 50 A 32. for the circuit shown in figure find the value of E. E 40Ω 30Ω 60Ω
33. find the current in (2) using Nodal Analysis in figure 34. In series R-L circuit consist of resistance 100 Ω and inductance 30mH with voltage across 220 volt, 50Hz. Determine: Resultant current. Power factor. Power in VA. Quality factor. Voltage across R and L. 35. find the current in (27Ω) using Nodal Analysis in figure 36. find the current in (8 Ω) by using superposition method in figure 1 5Ω 150A 8Ω 80 v
37. find RMS, Average values, form factor and peak factor in figure V(t) 20 2 4 6 t 38. find R eq for the circuit shown in figure 6Ω 8Ω 100 v 4Ω 1 39. find the current in (90Ω) for the circuit shown in figure by using Thevenin Theorem. 50 v 20Ω 3 90Ω 44Ω 1 40. A resistance of 80Ω, inductance of 5mH, and capacitance of 200µF connected in series across 100v and 50 Hz. Determine: Impedance. Current. Power factor. Voltage across R, L, C. Power in VA.
41. find R eq between A and B for the circuit shown in figure A 5kΩ 30Ω 60Ω Req 200Ω B 30Ω 60Ω 42. using nodal analysis find the currents in the figure 43. find the currents in the circuit shown by kirchoffs law. 44. Find the current in each resistor using mesh method. 45. Find the current in each resistor using nodal analysis.
46. Find the current in each resistance by using super position theorem. 47. Find the current in 60 ohm by using thevenin. 48. Find the current in 5ohm using Norton method. 49. A 50 XC and a 60 resistance are in series across a 110V source Calculate the impedance. 50. A 200 resistor, a 100 XL, and an 80 XC are placed in parallel across a120v AC source.find: (1) the branch currents, (2) the total current, and (3) the impedance. 51. A series circuit has a 50Ώ, a 75 Ώ, and a 100 Ώ resistor in series Find the voltage necessary to produce a current of 0.5 amps.
52. Find the total resistance of a 4Ohm, an 8Ohm, and a 16Ohm resistor in parallel 53. Find the current in a circuit (Figure below) by using Kirchhoff s voltage law 54. Find I2 in the circuit shown in Figure Below using Kirchhoff s voltage and current laws.
55. Find i1 and i2! If i1 and i2 is the direction of electron flow 56. Find i1 and i2! If i1 and i2 is the direction of current flow 57. Find Vx by applying Kirchhoff voltage loop at loop 1 and loop 2. For simplifying use this equation: i1 i2 = 2 A. 58. Find I4
59. A 10μF capacitor is connected in series to a 120V, 60Hz power source Find the capacitive reactance and the current flowing in the circuit. Draw the phasor diagram. 60. Using super position method find the current in 30kΩ. 61. Using mesh analysis method find the current in 20kΩ. 62. Using nodal analysis method find the current in 40Ω.
63. Using nodal analysis method find the current in 5Ω. 25Ω 5Ω 4.8A 30Ω ia 0.5 ia 5Ω 64. Find the power in the figure below using thevenin method. 25Ω 5Ω 4.8A 30Ω ia 0.5 ia 5Ω 65. Using nodal analysis method find the current in 5Ω. 1 5Ω 150A 8Ω 80 v 66. Using superposition method find the current in 2. 67. Using thevenin method find the current in 1Ω.
1Ω 5Ω 10 v 4Ω 68. Using superposition method find the current in 2. 12 v 4Ω 0.2vx 6Ω vx 9Ω 69. Using superposition method find the current in 2. 8Ω 4Ω 300 v 1 7Ω 50 A 70. Find the value of R1, RL and L if you know that the value of VL= 150volt and the current flow the circuit is 1.5 A with angle 55 lagging. XL R1 RL 220<0 50Hz AC VL 71. Find Req for the circuit shown below. 20Ω 15kΩ DC 60v 15kΩ 18Ω 72. Find the value of R, L and C if you know that the value of VR is 100 volt and the value of VL is 100 volt and the value of Vc is 20 volt when you know that the value of current through circuit 7A with angle 30 leading.
R L C 220<0 50Hz AC 73. Find Thevenin equivalent between A and B. 74. Find Thevenin equivalent in 2 ohm. 75. Find Norton equivalent in 4k ohm.
76. Find Thevenin equivalent in 7 ohm. 77. Find Norton equivalent in 7 ohm. 78. Find the current in 5 ohm using super position theory. 79. Find the current in 220 ohm using super position theory.
80. Find the currents in the circuit shown below using super position theory.