Welcome to the **Electricity and Electrical Circuits MCQs** with Answers. In this post, we are sharing **Electricity and Electrical Circuits** Multiple Choice Questions and Answers in Everyday Science* *section for various competitive exams in Pakistan. Each question offers a chance to enhance your knowledge regarding **Electricity and Electrical Circuits** online MCQs Test.

What is the unit of electric current?

a) Volt

b) Ohm

c) Watt

d) Ampere

Which component is used to store electrical energy in a circuit?

a) Resistor

b) Capacitor

c) Inductor

d) Transformer

What is Ohm’s Law?

a) V = IR

b) P = IV

c) E = mc²

d) F = ma

What does a resistor do in an electrical circuit?

a) Stores energy

b) Converts electrical energy to mechanical energy

c) Provides resistance to the flow of current

d) Changes the voltage level

Which of the following is the correct formula for electrical power?

a) P = IV

b) P = I²R

c) P = V²/R

d) All of the above

In a series circuit, what happens to the total resistance as more resistors are added?

a) It decreases

b) It remains the same

c) It increases

d) It depends on the voltage

What is the purpose of a fuse in an electrical circuit?

a) To store electrical energy

b) To increase the current flow

c) To protect the circuit from overloads

d) To convert AC to DC

What is the unit of electrical resistance?

a) Volt

b) Ampere

c) Ohm

d) Watt

What type of current flows continuously in one direction?

a) Alternating current

b) Direct current

c) Pulsating current

d) Static current

Which component is used to measure electric current?

a) Voltmeter

b) Ammeter

c) Ohmmeter

d) Wattmeter

What is the effect of increasing the voltage across a resistor?

a) The current decreases

b) The resistance increases

c) The power dissipated increases

d) The power dissipated decreases

What is the unit of electric charge?

a) Volt

b) Ampere

c) Coulomb

d) Ohm

In a parallel circuit, what happens to the total current as more branches are added?

a) It decreases

b) It remains the same

c) It increases

d) It fluctuates

Which law states that the total current entering a junction equals the total current leaving the junction?

a) Ohm’s Law

b) Kirchhoff’s Current Law

c) Faraday’s Law

d) Lenz’s Law

What is the function of a diode in a circuit?

a) To store energy

b) To allow current to flow in one direction only

c) To change the current

d) To measure voltage

What does a transformer do in an electrical circuit?

a) Converts AC to DC

b) Changes the voltage level

c) Measures electrical resistance

d) Stores electrical energy

What is the purpose of an inductor in an electrical circuit?

a) To resist changes in current

b) To measure voltage

c) To store electrical charge

d) To convert AC to DC

Which device is used to measure voltage across two points in a circuit?

a) Ammeter

b) Voltmeter

c) Ohmmeter

d) Multimeter

What is the term for the flow of electric charge through a conductor?

a) Voltage

b) Resistance

c) Current

d) Power

What happens to the total resistance in a parallel circuit if one of the resistors is removed?

a) It increases

b) It decreases

c) It remains the same

d) It becomes zero

Which of the following describes electrical energy dissipation in a resistor?

a) Inductive reactance

b) Resistive heating

c) Capacitive reactance

d) Magnetic flux

What does a capacitor do in an AC circuit?

a) Blocks AC and passes DC

b) Stores and releases electrical energy

c) Converts AC to DC

d) Measures current

What is the formula for calculating the total resistance of resistors in series?

a) Rt = R1 + R2 + R3

b) Rt = 1/(1/R1 + 1/R2)

c) Rt = R1 * R2

d) Rt = (R1 + R2) / 2

Which device converts mechanical energy into electrical energy?

a) Generator

b) Transformer

c) Capacitor

d) Battery

In an AC circuit, what does RMS stand for?

a) Root Mean Square

b) Relative Measurement Standard

c) Random Magnetic Signal

d) Rated Mechanical Speed

What type of circuit is characterized by having components connected end-to-end so that the current has only one path to follow?

a) Parallel circuit

b) Series circuit

c) Complex circuit

d) Mixed circuit

What is the primary purpose of a circuit breaker?

a) To increase current flow

b) To measure electrical power

c) To protect the circuit from overload

d) To store electrical energy

Which component is used to control the flow of current in a circuit?

a) Switch

b) Transformer

c) Capacitor

d) Inductor

What is the relationship between power, voltage, and current in an electrical circuit?

a) P = V / I

b) P = I / V

c) P = I * V

d) P = V * I / 2

What happens to the total current in a series circuit if the total resistance is increased?

a) It increases

b) It decreases

c) It remains the same

d) It fluctuates

Which device is used to measure the resistance of a component?

a) Voltmeter

b) Ammeter

c) Ohmmeter

d) Multimeter

In a parallel circuit, how does the voltage across each resistor compare?

a) It is different for each resistor

b) It is equal for all resistors

c) It is zero for all resistors

d) It is the average voltage of all resistors

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

a) To measure voltage

b) To store energy

c) To control a high-power circuit with a low-power signal

d) To convert AC to DC

Which of the following components can be used to temporarily store electrical charge?

a) Resistor

b) Inductor

c) Capacitor

d) Transformer

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

a) To store electrical energy

b) To regulate voltage

c) To prevent overheating by breaking the circuit in case of overload

d) To measure resistance

What is the effect of connecting a battery to a circuit in series with a resistor?

a) The voltage across the resistor is zero

b) The current in the circuit is determined by the battery voltage and resistor value

c) The battery will quickly discharge

d) The resistor will short-circuit the battery

Which instrument is used to measure the total voltage in a circuit?

a) Multimeter

b) Ohmmeter

c) Voltmeter

d) Ammeter

What is the effect of increasing the resistance in a circuit with a constant voltage source?

a) The current increases

b) The current decreases

c) The voltage decreases

d) The power output increases

Which type of circuit component is characterized by having two terminals and a specific resistance value?

a) Diode

b) Capacitor

c) Resistor

d) Inductor

What is the unit of electrical power consumption in a circuit?

a) Joule

b) Watt

c) Ampere

d) Volt

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