Current Electricity: Master the Basics with Interactive Quizzes

Question 1

If the resistance of a wire is doubled, the current flowing through it will:

Accepted Answer

Halve

Answer

Double

Answer

Remain the same

Answer

Increase four times

Question 2

Which of the following devices converts electrical energy into light energy?

Accepted Answer

Light bulb

Answer

Battery

Answer

Resistor

Answer

Capacitor

Question 3

What is the unit of measurement for electrical resistance?

Accepted Answer

Ohm (Ω)

Answer

Ampere (A)

Answer

Volt (V)

Answer

Watt (W)

Question 4

State Ohm's law.

Accepted Answer

V = IR

Answer

I = VR

Answer

R = VI

Answer

V = I/R

Question 5

Two resistors with resistances of 10 ohms and 20 ohms are connected in parallel. What is the total resistance?

Accepted Answer

5 ohms

Answer

10 ohms

Answer

15 ohms

Answer

20 ohms

Question 6

The resistance of a conductor signifies its:

Accepted Answer

Ability to hinder the flow of electric current

Answer

Ability to facilitate the flow of electric current

Answer

Length

Answer

Cross-sectional area

Question 7

According to Ohm's law, the electric current flowing through a conductor is directly proportional to the:

Accepted Answer

Voltage applied across the conductor

Answer

Resistance of the conductor

Answer

Length of the conductor

Answer

Cross-sectional area of the conductor

Question 8

A circuit with only one pathway for current to traverse is known as a:

Accepted Answer

Series circuit

Answer

Parallel circuit

Answer

Mixed circuit

Answer

Open circuit

Question 9

The formula used to calculate the power dissipated in a resistor is:

Accepted Answer

P = I²R

Answer

P = IV

Answer

P = V²/R

Answer

P = RI

Question 10

The primary function of a fuse in an electrical circuit is to:

Accepted Answer

Safeguard the circuit from excessive current

Answer

Increase the circuit's resistance

Answer

Reduce the circuit's voltage

Answer

Store electrical energy

Question 11

A characteristic unique to superconductors is their:

Accepted Answer

Zero electrical resistance

Answer

High electrical resistance

Answer

Low melting point

Answer

High specific heat capacity

Question 12

The purpose of a circuit breaker is to:

Accepted Answer

Automatically interrupt the circuit when the current exceeds a certain value

Answer

Manually interrupt the circuit when the current exceeds a certain value

Answer

Increase the circuit's resistance when the current exceeds a certain value

Answer

Decrease the circuit's voltage when the current exceeds a certain value

Question 13

In a circuit consisting of a resistor, battery, and voltmeter connected in series, how does the voltmeter reading change as the resistance of the resistor increases?

Accepted Answer

Decreases

Answer

Increases

Answer

Remains constant

Answer

Fluctuates

Question 14

Which of the following is the SI unit of electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 15

The resistance of a conductor is directly proportional to its:

Accepted Answer

Length

Answer

Cross-sectional area

Answer

Temperature

Answer

Voltage applied

Question 16

Which of the following is the mathematical expression for Ohm's law?

Accepted Answer

V = IR

Answer

I = VR

Answer

R = IV

Answer

P = IV

Question 17

A circuit with a resistance of 10 ohms has a current of 2 amperes flowing through it. What is the voltage across the circuit?

Accepted Answer

10 volts

Answer

5 volts

Answer

20 volts

Answer

50 volts

Question 18

A resistor with a resistance of 10 ohms is connected to a 12-volt battery. What is the current flowing through the resistor?

Accepted Answer

0.83 amperes

Answer

1.2 amperes

Answer

10 amperes

Answer

12 amperes

Question 19

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

Accepted Answer

To protect the circuit from excessive current

Answer

To regulate the voltage in the circuit

Answer

To provide a path for the current to flow

Answer

To store energy in the circuit

Question 20

Which of the following is a conductor of electricity?

Accepted Answer

Copper

Answer

Plastic

Answer

Rubber

Answer

Wood

Question 21

What is the function of an ammeter in an electrical circuit?

Accepted Answer

To measure current

Answer

To measure voltage

Answer

To measure resistance

Answer

To measure power

Question 22

What is the SI unit of electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Coulomb

Question 23

As defined by Ohm's law, what is the relationship between current (I), voltage (V), and resistance (R) in a circuit?

Accepted Answer

I = V / R

Answer

I = V - R

Answer

V = I / R

Answer

R = I - V

Question 24

Which of the following materials is a good conductor of electricity?

Accepted Answer

Copper

Answer

Wood

Answer

Plastic

Answer

Rubber

Question 25

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

Accepted Answer

To prevent excessive current flow

Answer

To provide a path for current to bypass a fault

Answer

To store electrical energy

Answer

To increase the voltage in the circuit

Question 26

When a current of 5 amperes flows through a resistor with a resistance of 10 ohms, what is the power dissipated in the resistor?

Accepted Answer

25 watts

Answer

50 watts

Answer

100 watts

Answer

200 watts

Question 27

Which type of electrical circuit allows current to flow in only one direction?

Accepted Answer

DC circuit

Answer

Series circuit

Answer

Parallel circuit

Answer

AC circuit

Question 28

Which of the following is NOT a recommended safety precaution when working with electrical circuits?

Accepted Answer

Touching live wires with bare hands

Answer

Wearing insulated gloves

Answer

Using a voltage tester

Answer

Keeping work area dry

Question 29

Compare the advantages and disadvantages of fuses and circuit breakers in electrical circuits.

Accepted Answer

Fuses: single-use, low cost, fast-acting; Circuit breakers: reusable, higher cost, slower-acting

Answer

Circuit breakers: single-use, low cost, fast-acting; Fuses: reusable, higher cost, slower-acting

Answer

Fuses: reusable, low cost, slow-acting; Circuit breakers: single-use, higher cost, fast-acting

Answer

Fuses: single-use, higher cost, slow-acting; Circuit breakers: reusable, low cost, fast-acting

Question 30

Which of these factors directly influences the power dissipated in a circuit?

Accepted Answer

Current

Accepted Answer

Voltage

Accepted Answer

Resistance

Answer

Capacitance

Question 31

According to Ohm's law, the relationship between current (I), voltage (V), and resistance (R) is expressed as:

Accepted Answer

V = IR

Answer

I = VR

Answer

R = VI

Answer

I = R/V

Question 32

The primary function of a fuse in an electrical circuit is to:

Accepted Answer

Prevent excessive current flow

Answer

Allow current to flow only in one direction

Answer

Store electrical energy

Answer

Regulate voltage

Question 33

Which of the listed options is NOT a type of resistor?

Accepted Answer

Capacitor

Answer

Fixed resistor

Answer

Variable resistor

Answer

Thermistor

Question 34

The primary purpose of a transformer is to:

Accepted Answer

Change the voltage of an alternating current (AC)

Answer

Change the frequency of an alternating current (AC)

Answer

Convert alternating current (AC) to direct current (DC)

Answer

Store electrical energy

Question 35

In a circuit, the flow of electric charge is known as:

Accepted Answer

Current

Answer

Voltage

Answer

Resistance

Answer

Power

Question 36

The SI unit of electric current is the:

Accepted Answer

Ampere

Answer

Ohm

Answer

Volt

Answer

Watt

Question 37

The relationship between voltage (V), current (I), and resistance (R) in a circuit is described by:

Accepted Answer

Ohm's law

Answer

Kirchhoff's laws

Answer

Lenz's law

Answer

Faraday's law

Question 38

Which of the following is an example of a good conductor of electricity?

Accepted Answer

Copper

Answer

Wood

Answer

Plastic

Answer

Rubber

Question 39

The power (P) dissipated in a resistor is given by the equation:

Accepted Answer

P = I^2R

Answer

P = IV

Answer

P = V^2/R

Answer

P = VR

Question 40

In a series circuit, the equivalent resistance is:

Accepted Answer

Equal to the sum of the individual resistances

Answer

Greater than the sum of the individual resistances

Answer

Less than the sum of the individual resistances

Answer

Dependent on the voltage applied

Question 41

A voltmeter is primarily used to measure:

Accepted Answer

Voltage

Answer

Current

Answer

Resistance

Answer

Power

Question 42

The standard international (SI) unit for electric current is the:

Accepted Answer

Ampere (A)

Answer

Ohm (Ω)

Answer

Volt (V)

Question 43

According to Ohm's Law, the current flowing through a conductor is:

Accepted Answer

Directly proportional to the voltage across it

Answer

Proportional to the square of the voltage across it

Answer

Independent of the voltage across it

Answer

Inversely proportional to the voltage across it

Question 44

A fuse is a safety device that:

Accepted Answer

Melts when the current through it exceeds a specified value

Answer

Breaks the circuit when the voltage across it exceeds a certain value

Answer

Provides a path for current to flow when the circuit is overloaded

Answer

Releases a gas when the current through it exceeds a certain value

Question 45

Which of the following is NOT a property of a good conductor of electricity?

Accepted Answer

High resistance

Answer

Shiny appearance

Answer

Ductility

Answer

Low resistivity

Question 46

In a series circuit, the total resistance is:

Accepted Answer

Equal to the sum of the individual resistances

Answer

Greater than the sum of the individual resistances

Answer

Less than the sum of the individual resistances

Answer

Dependent on the arrangement of the resistors

Question 47

Which of the following is the SI unit of electric current?

Accepted Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Answer

Watt (W)

Question 48

In a circuit, the power dissipated by a resistor with resistance R carrying a current I is given by:

Accepted Answer

I²R

Answer

R/I

Answer

I/R

Answer

IR

Question 49

In a parallel circuit, the total current is:

Accepted Answer

Equal to the sum of the currents in each branch

Answer

Equal to the current in the branch with the highest resistance

Answer

Zero

Answer

Equal to the current in the branch with the lowest resistance

Question 50

Which of the following is a characteristic property of a superconductor?

Accepted Answer

Zero electrical resistance

Answer

High magnetic permeability

Answer

High electrical resistance

Answer

Low thermal conductivity

Question 51

In a series circuit, the total resistance is:

Accepted Answer

Equal to the sum of the resistances of all the components

Answer

Equal to the resistance of the component with the lowest resistance

Answer

Equal to the resistance of the component with the highest resistance

Question 52

Which of the following devices converts electrical energy into mechanical energy?

Accepted Answer

Electric motor

Answer

Battery

Answer

Capacitor

Answer

Transistor

Question 53

Which of the following statements about electric circuits is correct?

Accepted Answer

Current flows from higher potential to lower potential.

Answer

Current flows from lower potential to higher potential.

Answer

Current flows only in open circuits.