Master Electrical Concepts: A Comprehensive Guide for Electrical Engineering Students

Question 1

What is the scientific unit of electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 2

Identify the material that is NOT a conductor of electricity.

Accepted Answer

Rubber

Answer

Copper

Answer

Silver

Answer

Aluminium

Question 3

Describe the relationship between voltage, electric current, and resistance in an electrical circuit?

Accepted Answer

Voltage = Current × Resistance

Answer

Voltage = Resistance × Current

Answer

Current = Voltage × Resistance

Answer

Current = Resistance × Voltage

Question 4

Explain the purpose of a fuse within an electrical circuit.

Accepted Answer

To hinder excessive current flow

Answer

To regulate voltage within the circuit

Answer

To store electrical energy

Answer

To control the frequency of current flow

Question 5

Specify the function of a transformer within an electrical system.

Accepted Answer

To adjust the voltage of an AC current, either increasing or decreasing it.

Answer

To convert AC current to DC current

Answer

To conserve electrical energy

Answer

To manage the frequency of an AC current

Question 6

What is the SI unit for measuring electrical power?

Accepted Answer

Watt

Answer

Ampere

Answer

Volt

Answer

Ohm

Question 7

Calculate the power consumption of a 100W light bulb that has been in operation for 5 hours.

Accepted Answer

5 kWh

Answer

0.5 kWh

Answer

50 kWh

Answer

500 kWh

Question 8

Specify the purpose of a resistor in an electrical circuit.

Accepted Answer

To limit the flow of current

Answer

To heighten voltage within the circuit

Answer

To store electrical energy

Answer

To regulate the frequency of current flow

Question 9

According to the International System of Units (SI), what is the unit of electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 10

In a circuit where the resistance is 10 ohms and the voltage is 12 volts, what is the current flowing through the circuit?

Accepted Answer

0.83 A

Answer

1.2 A

Answer

10 A

Answer

12 A

Question 11

Which of the following is NOT a recognized type of electrical circuit?

Accepted Answer

Concentric circuit

Answer

Series circuit

Answer

Parallel circuit

Answer

Radial circuit

Question 12

When a 100-ohm resistor is connected to a battery with a voltage of 12 volts, what is the power dissipated by the resistor?

Accepted Answer

144 W

Answer

12 W

Answer

100 W

Answer

1200 W

Question 13

Which material is known for its excellent ability to conduct electricity?

Accepted Answer

Copper

Answer

Wood

Answer

Rubber

Answer

Glass

Question 14

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

Accepted Answer

To prevent damage caused by excessive current flow

Answer

To increase the voltage within the circuit

Answer

To reduce the resistance in the circuit

Answer

To store electrical energy

Question 15

Which formula is used to calculate the resistance of a material?

Accepted Answer

R = V/I

Answer

R = I/V

Answer

R = P/I

Answer

R = I/P

Question 16

What is the key difference between AC and DC current?

Accepted Answer

AC current periodically changes direction while DC current flows in a constant direction

Answer

DC current periodically changes direction while AC current flows in a constant direction

Answer

AC current has a higher voltage than DC current

Answer

DC current has a higher frequency than AC current

Question 17

What is the main purpose of a capacitor in an electrical circuit?

Accepted Answer

To store electrical energy

Answer

To reduce voltage

Answer

To increase current

Answer

To protect against excessive current

Question 18

In a circuit with a constant voltage source, what happens to the current when the resistance increases?

Accepted Answer

The current decreases.

Answer

The current increases.

Question 19

Define voltage and explain its relationship with electrical potential energy.

Accepted Answer

Voltage is the difference in electrical potential between two points, measured in volts.

Answer

Voltage is the force that drives electrons within a conductor, measured in volts.

Answer

Voltage is a measure of the electrical potential energy stored within an object, with joules as its unit of measurement.

Answer

Voltage represents the flow of electrons through a conductor, measured in amperes.

Question 20

The SI unit of electrical current is the:

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 21

In an electrical circuit, the relationship between voltage (V), current (I), and resistance (R) is given by:

Accepted Answer

V = IR

Answer

I = VR

Answer

R = VI

Answer

V = I/R

Question 22

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

Accepted Answer

Copper

Answer

Plastic

Answer

Wood

Answer

Rubber

Question 23

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

Accepted Answer

Protect the circuit from excessive current

Answer

Regulate the flow of current

Answer

Store electrical energy

Answer

Convert AC to DC current

Question 24

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

Accepted Answer

DC circuit

Answer

AC circuit

Answer

Parallel circuit

Answer

Series circuit

Question 25

The formula for calculating the power (P) dissipated in an electrical circuit is:

Accepted Answer

P = VI

Answer

P = V/I

Answer

P = I/V

Answer

P = R/I

Question 26

Connecting resistors in parallel in an electrical circuit will:

Accepted Answer

Decrease total resistance

Answer

Increase total resistance

Answer

Have no effect on resistance

Answer

Reverse the direction of current flow

Question 27

A transformer in an electrical system is used to:

Accepted Answer

Increase or decrease voltage

Answer

Convert AC to DC current

Answer

Store electrical energy

Answer

Protect the circuit from overcurrent

Question 28

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

Accepted Answer

Ampere (A)

Answer

Ohm (Ω)

Answer

Watt (W)

Answer

Volt (V)

Question 29

What fundamental relationship is expressed by Ohm's Law in an electrical circuit?

Accepted Answer

Voltage (V) is directly proportional to Current (I) and Resistance (R)

Answer

Current (I) is inversely proportional to Resistance (R)

Answer

Voltage (V) is inversely proportional to Current (I)

Question 30

Which material is known for its ability to conduct electricity efficiently?

Accepted Answer

Copper

Answer

Plastic

Answer

Rubber

Answer

Wood

Question 31

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

Accepted Answer

To interrupt the circuit and prevent damage in the event of excessive current flow

Answer

To store electrical energy for later use

Answer

To increase the current flow in the circuit

Answer

To regulate the voltage level in the circuit

Question 32

Which type of electrical power is characterized by a continuously reversing direction of current flow?

Accepted Answer

Alternating current (AC)

Answer

Direct current (DC)

Answer

Magnetic field

Answer

Gravitational force

Question 33

The formula for calculating electrical power in a circuit is:

Accepted Answer

Power (P) = Voltage (V) x Current (I)

Answer

Power (P) = Resistance (R) / Current (I)

Answer

Power (P) = Current (I) / Voltage (V)

Answer

Power (P) = Voltage (V) / Resistance (R)

Question 34

Which of the following is an essential safety precaution when working with electricity?

Accepted Answer

Always check for live wires before touching electrical equipment

Answer

Touch electrical equipment with wet hands

Answer

Leave electrical wires exposed and unsecured

Question 35

What is the key difference between an open circuit and a closed circuit in electricity?

Accepted Answer

An open circuit has a break in the conductive path, preventing current flow, while a closed circuit provides a complete path for current to flow

Answer

An open circuit has a higher resistance than a closed circuit

Answer

An open circuit allows current to flow, while a closed circuit does not

Question 36

Which electrical component is designed to resist the flow of electric current?

Accepted Answer

Resistor

Answer

Diode

Answer

Capacitor

Answer

Ammeter

Question 37

What is the function of a transformer in an electrical system?

Accepted Answer

To alter the voltage level of an AC power supply

Answer

To store electrical energy

Answer

To regulate the flow of direct current

Answer

To protect the circuit from overloads

Question 38

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

Accepted Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Question 39

Which of the following materials is a conductor of electricity?

Accepted Answer

Copper

Answer

Wood

Answer

Plastic

Answer

Rubber

Question 40

What is the primary function of a capacitor in an electrical circuit?

Accepted Answer

To store electrical charge

Answer

To conduct electricity with minimal resistance

Answer

To generate electricity

Answer

To resist the flow of electricity

Question 41

Which of the following is a characteristic of an inductor?

Accepted Answer

It opposes changes in current

Answer

It generates electricity when exposed to a magnetic field

Answer

It conducts electricity without resistance

Answer

It stores electrical energy in an electric field

Question 42

What is the fundamental difference between AC and DC current?

Accepted Answer

AC current changes direction periodically, while DC current flows in one direction only

Answer

AC current has a higher voltage than DC current

Answer

DC current is more efficient than AC current

Question 43

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

Accepted Answer

To protect the circuit from excessive current

Answer

To store electrical energy

Answer

To regulate the voltage in the circuit

Answer

To isolate one part of the circuit from another

Question 44

What is the primary function of a transformer in an electrical circuit?

Accepted Answer

To change the voltage or current in the circuit

Answer

To store electrical energy

Answer

To isolate one part of the circuit from another

Answer

To protect the circuit from excessive current