# 100+ Current Electricity Questions

1. Which of the following elements of electrical engineering cannot be analyzed using Ohm’s law?
a) Capacitors
b) Inductors
c) Transistors
d) Resistance

2. What is constant for a charged spherical shell according to basic electrical energy?
a) Electrical potential outside the spherical shell
b) Electrical potential inside the spherical shell
c) Electrical field outside the spherical shell
d) Electrical field inside the spherical shell

3. Where does electro-static shielding occur in a charged spherical shell?
a) When electrical potential outside spherical shell is zero
b) When electrical potential inside the spherical shell is zero
c) When electrical field outside the spherical shell
d) Electrical field inside the spherical shell

4. Which of the following is a correct representation of peak value in an AC Circuit?
a) RMS value/Peak factor
b) RMS value*Form factor
c) RMS value/Form factor
d) RMS value*Peak factor

5. Which of the following according to fundaments of electrical energy is correct about alternating current?
a) Frequency is zero
b) Magnitude changes with time
c) Can be transported to larger distances with less loss in power
d) Flows in both directions

6. How many cycles will an AC signal make in 2 seconds if its frequency is 100 Hz?
a) 50
b) 100
c) 150
d) 200

7. What will be the direction of the drift velocity of electrons change with respect to the electric field?
a) same as that of electric field
b) opposite to that of electric field
c) perpendicular to that of the electric field in a positive direction
d) perpendicular to that of the electric field in a negative direction

8. What will be the current density of metal if a current of 30A is passed through a cross-sectional area of 0.5m2?
a) 7.5 A/m2
b) 15 A/m2
c) 60 A/m2
d) 120 A/m2

9. Which of the following is correct about the power consumed by R1 and R2 connected in series if the value of R1 is greater than R2?
a) R1 will consume more power
b) R2 will consume more power
c) R1 and R2 will consume the same power
d) The relationship between the power consumed cannot be established

10. What is zero for a charged spherical shell?
a) Electrical potential outside the spherical shell
b) Electrical potential inside the spherical shell
c) Electrical field outside the spherical shell
d) Electrical field inside the spherical shell

11. What kind of quantity is an Electric potential?
a) Vector quantity
b) Tensor quantity
c) Scalar quantity
d) Dimensionless quantity

12. What do crowded lines of force indicate?
a) Strong electric field
b) Weak electric field
c) Strong electric potential
d) Weak electric potential

13. What is the direction of the electric field at a point?
a) Along the line perpendicular to the electric field
b) Along the line tangent to the electric field
c) Electric field has no direction
d) Electric field has a random direction

14. What is the magnitude of mutually induced emf, E2 in a transformer?
a) directly proportional to rate of change of flux and number of secondary turns
b) inversely proportional to rate of change of flux and number of secondary turns
c) proportional to rate of change of flux and inversely proportional to number of secondary turns
d) inversely proportional to the rate of change of flux and proportional to number of secondary turns

15. Which of the following will happen in a transformer when the number of secondary turns is less than the number of primary turns?
a) The voltage gets stepped up
b The voltage gets stepped down
c) The power gets stepped up
d) The power gets stepped down

16. What is the number of primary turns in a 200/1000 V transformer if the emf per turn is 10V?
a) 5
b) 10
c) 20
d) 40

17. Which of the following is a correct representation of average value in an AC Circuit?
a) RMS value/Form factor
b) RMS value*Form factor
c) RMS value/Peak factor
d) RMS value*Peak factor

18. Who defined electric current and devised a method to measure current?
b) Andre-Marie Ampere
c) Nikola Tesla
d) Alessandro Antonio Volta

19. How many electrons will constitute 2 Coulombs of electric charge?
a) 6.24 * 1018 electrons
b) 12.48 * 1018 electrons
c) 1.602 * 1019 electrons
d) 3.204 * 1019 electrons

20. Which of the following is correct about direct current?
a) Magnitude is constant
b) Frequency is zero
c) Can be transported to larger distances with less loss in power
d) Flows in one direction

21. Who witnessed the effect of magnetism for the first time?
a) Hans Christian Orsted
b) Alexander Graham Bell
d) Gustav Robert Kirchhoff

22. Which of the following according is correct about electrical conductivity?
a) It is the ratio of current density to the electric field
b) It is the product of current density and electric field
c) It is the ratio of the electric field to current density
d) It is the reciprocal of the product of current density and electric field

23. What is responsible for the current to flow?
a) Protons
b) Electrons
c) Nucleus
d) Protons and Electrons

24. Which of the following according to KCL must be zero?
a) Algebraic sum of currents in closed-loop
b) Algebraic sum of power in closed-loop
c) Algebraic sum of currents entering and leaving a junction
d) Algebraic sum of voltages across the input and output

25. How many directions can the electric field at a point have?
a) Zero
b) One
c) Two
d) Many

26. Which of the following will happen in a transformer when the number of secondary turns is greater than the number of primary turns?
a) The voltage gets stepped up
b) The voltage gets stepped down
c) The power gets stepped up
d) The power gets stepped down

27. Which of the following is correct about the voltage transformation ratio in electrical engineering?
a) Ratio of number of primary turns to the number of secondary turns
b) Ratio of induced emf in secondary to induced emf in primary
c) Ratio of secondary current to the primary current
d) Ratio of power in primary to power in secondary

28. Which of the following according to the fundamentals of electrical engineering is correct about the induced emf in primary of transformer?
a) It is the ratio of primary turns to emf induced per turn
b) It is the product of primary turns and emf induced per turn
c) It is the ratio of secondary turns to emf induced per turn
d) It is the product of secondary turns and emf induced per turn

29. Which of the following current is drawn by the primary circuit of an ideal transformer when the secondary is open?
a) Secondary current
b) Leakage current
c) Magnetizing current
d) Working on current

30. What does positive power in an electrical element indicate?
a) Element is absorbing power
b) Element is supplying power
c) Element may absorb or supply power
d) Element is neither absorbing nor supplying power

31. How does induce emf in DC motor react to supply voltage?
a) It will aid the supply voltage
b) It will be double the supply voltage
c) It will oppose the supply voltage
d) It will be half of the supply voltage

32. Which of the following type of circuits in electrical engineering cannot be analyzed using Ohm’s law?
a) Unilateral
b) Bilateral
c) Linear
d) Conductors

33. Which of the following according to KVL must be zero?
a) Algebraic sum of currents in closed-loop
b) Algebraic sum of power in closed-loop
c) Algebraic sum of losses in closed-loop
d) Algebraic sum of voltages in closed-loop

34. Find the current in the circuit.

a) 1 A
b) 2 A
c) 3 A
d) 4 A

35. In a series circuit, which of the parameters remain constant across all circuit elements such as resistor, capacitor and inductor etcetera?
a) Voltage
b) Current
c) Both voltage and current
d) Neither voltage nor current

36. Voltage across the 60ohm resistor is______

a) 72V
b) 0V
c) 48V
d) 120V

37. Find the voltage across the 6 ohm resistor.

a) 150V
b) 181.6V
c) 27.27V
d) 54.48V

38. If there are two bulbs connected in series and one blows out, what happens to the other bulb?
a) The other bulb continues to glow with the same brightness
b) The other bulb stops glowing
c) The other bulb glows with increased brightness
d) The other bulb also burns out

39. What is the value of x if the current in the circuit is 5A?

a) 15 ohm
b) 25 ohm
c) 55 ohm
d) 75 ohm

40. A voltage across a series resistor circuit is proportional to?
a) The amount of time the circuit was on for
b) The value of the resistance itself
c) The value of the other resistances in the circuit
d) The power in the circuit

41. Many resistors connected in series will?
a) Divide the voltage proportionally among all the resistors
b) Divide the current proportionally
c) Increase the source voltage in proportion to the values of the resistors
d) Reduce the power to zero

42. What is the voltage measured across a series short?
a) Infinite
b) Zero
c) The value of the source voltage
d) Null

43. What happens to the current in the series circuit if the resistance is doubled?
a) It becomes half its original value
b) It becomes double its original value
c) It becomes zero
d) It becomes infinity

44. If two bulbs are connected in parallel and one bulb blows out, what happens to the other bulb?
a) The other bulb blows out as well
b) The other bulb continues to glow with the same brightness
c) The other bulb glows with increased brightness
d) The other bulb stops glowing

45. Calculate the current across the 20 ohm resistor.

a) 10A
b) 20A
c) 6.67A
d) 36.67A

46. In a parallel circuit, with a number of resistors, the voltage across each resistor is ________
a) The same for all resistors
b) Is divided equally among all resistors
c) Is divided proportionally across all resistors
d) Is zero for all resistors

47. The current in each branch of a parallel circuit is proportional to _________
a) The amount of time the circuit is on for
b) Proportional to the value of the resistors
c) Equal in all branches
d) Proportional to the power in the circuit

48. Calculate the total current in the circuit.

a) 20 A
b) 10 A
c) 11.43 A
d) 15 A

49. The voltage across the open circuit is?

a) 100V
b) Infinity
c) 90V
d) 0V

50. The voltage across the short is?

a) 135V
b) Infinity
c) Zero
d) 11.25V

51. If the current through x ohm resistance in the circuit is 5A, find the value of x.

a) 27 ohm
b) 5 ohm
c) 12 ohm
d) 135 ohm

52. The currents in the three branches of a parallel circuit are 3A, 4A and 5A. What is the current leaving it?
a) 0A
b) Insufficient data provided
c) The largest one among the three values
d) 12A

53. The total resistance between A and B are?

a) 20 ohm
b) 5 ohm
c) 80 ohm
d) 0 ohm

54. It is preferable to connect bulbs in series or in parallel?
a) Series
b) Parallel
c) Both series and parallel
d) Neither series nor parallel

55. Calculate the total resistance between the points A and B.

a) 7 ohm
b) 0 ohm
c) 7.67 ohm
d) 0.48 ohm

56. Calculate the equivalent resistance between A and B.

a) 60 ohm
b) 15 ohm
c) 12 ohm
d) 48 ohm

57. Calculate the resistance between A and B.

a) 3.56 ohm
b) 7 ohm
c) 14.26 ohm
d) 29.69 ohm

58. Batteries are generally connected in______
a) Series
b) Parallel
c) Either series or parallel
d) Neither series nor parallel

59. In a _________ circuit, the total resistance is greater than the largest resistance in the circuit.
a) Series
b) Parallel
c) Either series or parallel
d) Neither series nor parallel

60. In a ____________ circuit, the total resistance is smaller than the smallest resistance in the circuit.
a) Series
b) Parallel
c) Either series or parallel
d) Neither series nor parallel

61. Which is the most cost efficient connection?
a) Series
b) Parallel
c) Either series or parallel
d) Neither series nor parallel

62. Calculate the equivalent resistance between A and B.

a) 2 ohm
b) 4 ohm
c) 6 ohm
d) 8 ohm

63. Calculate the equivalent resistance between A and B.

a) 6.67 ohm
b) 46.67 ohm
c) 26.67 ohm
d) 10.67 ohm

64. Find the value of v if v1=20V and value of current source is 6A.

a) 10V
b) 12V
c) 14V
d) 16V

65. Calculate the current A.

a) 5A
b) 10A
c) 15A
d) 20A

66. Calculate the current across the 20 ohm resistor.

a) 20A
b) 1A
c) 0.67A
d) 0.33A

67. Calculate the value of I3, if I1= 2A and I2=3A.

a) -5A
b) 5A
c) 1A
d) -1A

68. Find the value of i2, i4 and i5 if i1=3A, i3=1A and i6=1A.

a) 2,-1,2
b) 4,-2,4
c) 2,1,2
d) 4,2,4

69. What is the value of current if a 50C charge flows in a conductor over a period of 5 seconds?
a) 5A
b) 10A
c) 15A
d) 20A

70. KCL deals with the conservation of?
a) Momentum
b) Mass
c) Potential Energy
d) Charge

71. KCL is applied at _________
a) Loop
b) Node
c) Both loop and node
d) Neither loop nor node

72. KCL can be applied for __________
a) Planar networks
b) Non-planar networks
c) Both planar and non-planar
d) Neither planar nor non-planar

73. What is the value of the current I?

a) 8A
b) 7A
c) 6A
d) 5A

74. Calculate the value of V1 and V2.

a) 4V, 6V
b) 5V, 6V
c) 6V, 7V
d) 7V, 8V

75. KVL deals with the conservation of?
a) Mass
b) Momentum
c) Charge
d) Energy

76. Calculate the voltage across the 10 ohm resistor.

a) 12V
b) 4V
c) 10V
d) 0V

77. Find the value of the currents I1 and I2.

a) 0.3, 0.1
b) -0.1, -0.3
c) -0.3, -0.1
d) 0.1, 0.2

78. The sum of the voltages over any closed loop is equal to __________
a) 0V
b) Infinity
c) 1V
d) 2V

79. What is the basic law that has to be followed in order to analyze the circuit?
a) Newton’s laws
c) Ampere’s laws
d) Kirchhoff’s law

80. Every____________ is a ____________ but every __________ is not a __________
a) Mesh, loop, loop, mesh
b) Loop, mesh, mesh, loop
c) Loop, mesh, loop, mesh
d) Mesh, loop, mesh, loop

81. What is the voltage across the 5 ohm resistor if current source has current of 17/3 A?

a) 2.32V
b) 5.21V
c) 6.67V
d) 8.96V

82. Calculate VAB.

a) 3.5V
b) 12V
c) 9.5V
d) 6.5V

83. KVL is applied in ____________
a) Mesh analysis
b) Nodal analysis
c) Both mesh and nodal
d) Neither mesh nor nodal

84. Which of the following is not an expression power?
a) P=VI
b) P=I2R
c) P=V2/R
d) P=I/R

85. Which of the following statements are true?
a) Power is proportional to voltage only
b) Power is proportional to current only
c) Power is neither proportional to voltage nor to the current
d) Power is proportional to both the voltage and current

86. A 250V bulb passes a current of 0.3A. Calculate the power in the lamp.
a) 75W
b) 50W
c) 25W
d) 90W

87. Kilowatt-hour(kWh) is a unit of?
a) Current
b) Power
c) Energy
d) Resistance

88. Calculate the power in the 20 ohm resistance.

a) 2000kW
b) 2kW
c) 200kW
d) 2W

89. A current of 5A flows in a resistor of 2 ohms. Calculate the energy dissipated in 300 seconds in the resistor.
a) 15kJ
b) 15000kJ
c) 1500J
d) 15J

90. Calculate the power across each 20 ohm resistance.

a) 1000W, 1000W
b) 500W, 500W
c) 1000kW, 1000kW
d) 500kW, 500kW

91. Calculate the power across each 10 ohm resistance.

a) 1000kW, 1000kW
b) 1kW, 1kW
c) 100W, 100W
d) 100kW, 100kW

92. Calculate the work done in a resistor of 20 ohm carrying 5A of current in 3 hours.
a) 1.5J
b) 15J
c) 1.5kWh
d) 15kWh

93. The SI unit of power is?
a) kW(kilo-watt)
b) J/s(joules per second)
c) Ws(watt-second)
d) J/h(joules per hour

94. Which among the following is a unit for electrical energy?
a) V(volt)
b) kWh(kilowatt-hour)
c) Ohm
d) C(coloumb)

95. A bulb has a power of 200W. What is the energy dissipated by it in 5 minutes?
a) 60J
b) 1000J
c) 60kJ
d) 1kJ

96. Out of the following, which one is not a source of electrical energy?
a) Solar cell
b) Battery
c) Potentiometer
d) Generator

97. Calculate the energy dissipated by the circuit in 50 seconds.

a) 50kJ
b) 50J
c) 100j
d) 100kJ

98. Which among the following is an expression for energy?
a) V2It
b) V2Rt
c) V2t/R
d) V2t2/R

99. Calculate the energy in the 10 ohm resistance in 10 seconds.

a) 400J
b) 40kJ
c) 4000J
d) 4kJ

100. A battery converts___________
a) Electrical energy to chemical energy
b) Chemical energy to electrical energy
c) Mechanical energy to electrical energy
d) Chemical energy to mechanical energy

101. A current of 2A flows in a wire offering a resistance of 10ohm. Calculate the energy dissipated by the wire in 0.5 hours.
a) 72Wh
b) 72kJ
c) 7200J
d) 72kJh

102. Calculate the energy in the 5 ohm resistor in 20 seconds.

a) 21.5kJ
b) 2.15kJ
c) 2.15J
d) 21.5J

103. Practically, if 10kJ of energy is supplied to a device, how much energy will the device give back?
a) Equal to10kJ
b) Less than 10kJ
c) More than 10kJ
d) Zero

104. Materials which easily allow the passage of electric current are known as ______
a) Insulators
b) Conductors
c) Dielectrics
d) Semi-conductors

105. A wire of length 2m and another wire of length 5m are made up of the same material and have the same area of cross section, which wire has higher resistance?
a) Both have equal resistance
b) The 2m wire has higher resistance
c) The 5m wire has higher resistance
d) The value of resistance cannot be determined from the given data

106. A wire having an area of cross section = 10sqm and another wire having an area of cross section= 15sqm, have the same length and are made up of the same material. Which wire has more resistance?
a) Both have equal resistance
b) The 10sqm wire has higher resistance
c) The 15sqm wire has higher resistance
d) The value of resistance cannot be determined from the given data

107. Which of the following statements are true with regard to resistance?
a) Resistance is directly proportional to a length of the wire
b) Resistance is directly proportional to an area of cross section of the wire
c) Resistance is inversely proportional to the length of the wire
d) Resistance is inversely proportional to the resistivity of the wire

108. A wire has the same resistance as the one given in the figure. Calculate its resistivity if the length of the wire is 10m and its area of cross section is 2m.

a) 16 ohm-metre
b) 8 ohm-metre
c) 16 kiloohm-metre
d) 8 kiloohm-metre

109. Which, among the following is a unit for resistivity?
a) ohm/metre
b) ohm/metre2
c) ohm-metre
d) ohm-metre2

110. What is the resistivity of Copper?
a) 1.59*10-8ohm-m
b) 2.7*10-8ohm-m
c) 7.3*10-8ohm-m
d) 5.35*10-8ohm-m

111. Calculate the ratio of the resistivity of 2 wires having the same length and same resistance with area of cross section 2m2 and 5m2 respectively.
a) 5:7
b) 2:7
c) 2:5
d) 7:5

112. Which of the following statements are true with regard to resistivity?
a) Resistance depends on the temperature
b) Resistance does not depend on the temperature
c) Resistivity depend on the length
d) Resistivity depend on area of cross section

113. The reciprocal of resistivity is________
a) Conductance
b) Resistance
c) Conductivity
d) Impedance

114. The resistance of pure metals ___________
a) Increases with an increase in temperature
b) Decreases with an increase in temperature
c) Remains the same with an increase in temperature
d) Becomes zero with an increase in temperature

115. The resistance of insulators __________
a) Increases with an increase in temperature
b) Decreases with an increase in temperature
c) Remains the same with an increase in temperature
d) Becomes zero with an increase in temperature

116. Which of the following statements are true about metals?
a) Metals have a positive temperature coefficient
b) Metals have a negative temperature coefficient
c) Metals have zero temperature coefficient
d) Metals have infinite temperature coefficient

117. Which of the following statements are true about insulators?
a) Insulators have a positive temperature coefficient
b) Insulators have a negative temperature coefficient
c) Insulators have zero temperature coefficient
d) Insulators have infinite temperature coefficient

118. What is the unit of temperature coefficient?

119. A copper coil has a resistance of 200 ohms when its mean temperature is 0 degree centigrade. Calculate the resistance of the coil when its mean temperature is 80 degree centigrade. Temperature coefficient of copper is 0.004041 centigrade-1
a) 264.65 ohm
b) 264.65 kilo-ohm
c) 286.65 ohm
d) 286.65 kilo-ohm

120. The temperature of a coil cannot be measured by which of the following methods?
a) Thermometer
b) Increase in resistance of the coil
c) Thermo-junctions embedded in the coil
d) Calorimeter

121. The rise or fall in resistance with the rise in temperature depends on ________
a) The property of the conductor material
b) The current in the metal
c) Property of material as well current in that material
d) Does not depend on any factor

122. If the temperature is increased in semi-conductors such that the resistance incessantly falls, it is termed as _______
a) Avalanche breakdown
b) Zener breakdown
c) Thermal runway
d) Avalanche runway