Introduction to Electrical Engineering MCQs (Part-5)

What does Kirchhoff’s Current Law state?

A Resistance is constant
B Current is conserved
C Voltage is constant
D Power is conserved

What is the SI unit of electrical energy?

A Joule
B Volt
C Ampere
D Watt

What does the power formula P=I²R calculate?

A Resistance
B Voltage
C Power
D Current

What happens to current when resistance is doubled while keeping voltage constant?

A Quadruples
B Doubles
C Stays the same
D Halves

What does the formula P=V²/R calculate?

A Resistance
B Power
C Voltage
D Current

What is the unit of electric charge?

A Watt
B Volt
C Coulomb
D Ampere

Which of the following is a property of resistors in a circuit?

A Limit current flow
B Measure current
C Increase voltage
D Store energy

What does a transformer do?

A Increase current
B Change voltage
C Increase resistance
D Store energy

What is the function of a diode in an electrical circuit?

A Convert energy to light
B Allow current flow in one direction
C Measure resistance
D Store energy

What is the purpose of an electrical capacitor?

A Store energy
B Block current
C Store voltage
D Measure current

Which material is a good conductor of electricity?

A Plastic
B Wood
C Copper
D Rubber

What is the function of a circuit breaker?

A Increase current flow
B Break the circuit in case of overload
C Measure voltage
D Store energy

What does an inductor do in a circuit?

A Convert energy to light
B Store current
C Measure resistance
D Store energy in a magnetic field

What is the primary function of a voltage source in a circuit?

A Store energy
B Limit current
C Provide voltage to the circuit
D Control current flow

What happens to the total resistance in a series circuit?

A It increases
B It decreases
C It remains constant
D It fluctuates