Master Electrical Concepts: Voltage, Current, Resistance, and Power

Question 1

In electrical circuits, which unit is used to measure voltage?

Accepted Answer

Volt (V)

Answer

Ampere (A)

Answer

Ohm (Ω)

Answer

Watt (W)

Question 2

Which of the following options accurately describes the nature of current flow?

Accepted Answer

The movement of electrons

Answer

The movement of protons

Answer

The movement of neutrons

Answer

The movement of ions

Question 3

Which term describes the resistance encountered by current flow in an electrical circuit?

Accepted Answer

Resistance

Answer

Voltage

Answer

Power

Answer

Inductance

Question 4

Which material category allows for the conduction of electricity?

Accepted Answer

Conductors

Answer

Insulators

Answer

Semiconductors

Answer

Superconductors

Question 5

What is the term used to describe the work performed by an electrical current?

Accepted Answer

Power

Answer

Voltage

Answer

Current

Answer

Resistance

Question 6

Which formula accurately calculates voltage in an electrical circuit?

Accepted Answer

Voltage (V) = Current (I) × Resistance (R)

Answer

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

Answer

Voltage (V) = Current (I) / Resistance (R)

Answer

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

Question 7

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

Accepted Answer

To protect the circuit from excessive current

Answer

To regulate voltage levels in the circuit

Answer

To provide an alternative path for current flow

Answer

To store electrical energy

Question 8

Which of the following is not a recognized type of electrical wire?

Accepted Answer

Optical fiber

Answer

Solid core wire

Answer

Stranded wire

Answer

Coaxial cable

Question 9

In residential electrical circuits, what color is typically used to identify the neutral wire?

Accepted Answer

White

Answer

Black

Answer

Red

Answer

Blue

Question 10

When servicing electrical equipment or wiring, what safety precautions are essential to observe?

Accepted Answer

Utilize protective gear and follow proper grounding procedures

Answer

Wear loose-fitting clothes for enhanced comfort

Answer

Work in wet or humid environments to ensure proper electrical contact

Answer

Disregard any warning labels or signs on electrical equipment

Question 11

What is the SI unit of voltage?**

Accepted Answer

Volt

Answer

Ampere

Answer

Ohm

Answer

Watt

Question 12

Which type of electrical circuit has only one path for current to flow?**

Accepted Answer

Series circuit

Answer

Parallel circuit

Answer

Mixed circuit

Answer

Short circuit

Question 13

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

Accepted Answer

To protect the circuit from overcurrent

Answer

To isolate a faulty component

Answer

To regulate voltage

Answer

To store electrical energy

Question 14

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

Accepted Answer

Copper

Answer

Rubber

Answer

Wood

Answer

Glass

Question 15

What is the purpose of grounding in an electrical system?**

Accepted Answer

To provide a path for fault currents

Answer

To protect against electrical shocks

Answer

To regulate voltage

Answer

To store electrical energy

Question 16

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

Accepted Answer

To change voltage levels

Answer

To isolate circuits

Answer

To regulate current

Answer

To store electrical energy

Question 17

Which of the following is the unit of measurement for voltage?

Accepted Answer

Volt

Answer

Ampere

Answer

Ohm

Answer

Watt

Question 18

What is the relationship between voltage, current, and resistance?

Accepted Answer

Current = Voltage / Resistance

Answer

Voltage = Current x Resistance

Answer

Resistance = Voltage + Current

Answer

There is no relationship between these quantities

Question 19

Which of the following is a conductor of electricity?

Accepted Answer

Copper

Answer

Rubber

Answer

Wood

Answer

Plastic

Question 20

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

Accepted Answer

To protect the circuit from overcurrent

Answer

To regulate the flow of current

Answer

To store electrical energy

Answer

To isolate the circuit from the power source

Question 21

Which of the following is a basic tool used in electrical wiring?

Accepted Answer

Wire strippers

Answer

Voltmeter

Answer

Circuit breaker finder

Answer

Oscilloscope

Question 22

What is the difference between AC and DC current?

Accepted Answer

DC current flows in only one direction, while AC current flows in both directions

Answer

AC current flows in only one direction, while DC current flows in both directions

Answer

AC current has a higher voltage than DC current

Answer

DC current has a higher voltage than AC current

Question 23

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

Accepted Answer

To store electrical charge

Answer

To regulate voltage

Answer

To protect the circuit from overcurrent

Answer

To isolate the circuit from the power source

Question 24

Which type of wiring is most commonly employed for lighting circuits in residential buildings?

Accepted Answer

Romex wiring

Answer

Conduit wiring

Answer

BX wiring

Answer

MC cable

Question 25

Which of the following is the unit of measurement for voltage?

Accepted Answer

Volt

Answer

Ampere

Answer

Ohm

Answer

Watt

Question 26

What is the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit, as described by Ohm's Law?

Accepted Answer

V = IR

Answer

I = VR

Answer

R = VI

Answer

V = I/R

Question 27

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

Accepted Answer

Copper

Answer

Plastic

Answer

Rubber

Answer

Wood

Question 28

What is the primary function of an insulator in an electrical circuit?

Accepted Answer

To prevent the flow of current

Answer

To allow the flow of current

Answer

To store electrical energy

Answer

To generate electrical energy

Question 29

Which of the following is NOT a source of electrical energy?

Accepted Answer

Capacitor

Answer

Battery

Answer

Generator

Answer

Solar panel

Question 30

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

Accepted Answer

To protect against overcurrent

Answer

To store electrical energy

Answer

To regulate voltage

Answer

To isolate faulty components

Question 31

What is the fundamental difference between AC and DC current?

Accepted Answer

AC reverses direction periodically, while DC flows in one direction

Answer

DC reverses direction periodically, while AC flows in one direction

Answer

AC has a higher voltage than DC

Answer

DC has a higher current than AC

Question 32

Which quantity measures the rate of electric charge flow through a conductor?

Accepted Answer

Current

Answer

Voltage

Answer

Resistance

Answer

Power

Question 33

The SI unit of resistance is the:

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Answer

Watt

Question 34

Ohm's Law describes the relationship between which three circuit quantities?

Accepted Answer

Voltage, current, and resistance

Answer

Current, resistance, and power

Answer

Voltage, current, and power

Answer

Voltage, resistance, and power

Question 35

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

Accepted Answer

Protect against excessive current

Answer

Regulate current flow

Answer

Measure voltage

Answer

Enhance insulation

Question 36

Which of the following is the standard international unit of electrical current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 37

In an electrical circuit, what is the relationship between voltage (V), current (I), and resistance (R) according to Ohm's Law?

Accepted Answer

I = V / R

Answer

V = I * R

Answer

R = V / I

Answer

I = R * V

Question 38

Which material among the following conducts electricity?

Accepted Answer

Copper

Answer

Plastic

Answer

Rubber

Answer

Wood

Question 39

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

Accepted Answer

To prevent hazardous current flow

Answer

To regulate voltage levels

Answer

To store electrical energy

Answer

To isolate components

Question 40

Which type of electrical circuit has only a single path for current to flow?

Accepted Answer

Series circuit

Answer

Parallel circuit

Answer

Combination circuit

Answer

Short circuit

Question 41

What is the purpose of grounding in electrical systems?

Accepted Answer

To provide a safe path for fault currents

Answer

To increase voltage levels

Answer

To enhance signal transmission

Answer

To reduce resistance

Question 42

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

Accepted Answer

To change voltage levels

Answer

To isolate circuits

Answer

To regulate current

Answer

To store energy

Question 43

What is the standard international unit for measuring electrical power?

Accepted Answer

Watt

Answer

Volt

Answer

Ampere

Answer

Ohm

Question 44

What is the standard international (SI) unit of measurement for electrical current?

Accepted Answer

Ampere (A)

Answer

Watt (W)

Answer

Volt (V)

Answer

Ohm (Ω)

Question 45

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

Accepted Answer

To protect electrical circuits from damage caused by excessive current

Answer

To store electrical energy

Answer

To amplify electrical signals

Answer

To regulate voltage levels

Question 46

What is the fundamental difference between an electrical conductor and an insulator?

Accepted Answer

Conductors allow electrons to flow freely, while insulators obstruct electron flow

Answer

Conductors are made of metal, while insulators are made of plastic

Answer

Conductors are used to carry current, while insulators are used to protect wires

Question 47

What is the primary purpose of a transformer in an electrical system?

Accepted Answer

To convert alternating current (AC) voltage and current levels

Answer

To store electrical energy

Answer

To convert AC to direct current (DC)

Question 48

What is the main function of a resistor in an electrical circuit?

Accepted Answer

To limit or control the flow of electrical current

Answer

To increase voltage levels

Answer

To store electrical energy

Answer

To amplify electrical signals

Question 49

What is the standard international (SI) unit of measurement for electrical potential difference?

Accepted Answer

Volt (V)

Answer

Ampere (A)

Answer

Watt (W)

Answer

Ohm (Ω)

Question 50

In an electrical circuit, which quantity is measured in Amperes?

Accepted Answer

Current

Answer

Power

Answer

Resistance

Answer

Voltage

Question 51

Which material allows electricity to flow through it easily?

Accepted Answer

Copper

Answer

Plastic

Answer

Rubber

Answer

Wood

Question 52

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

Accepted Answer

To prevent damage to the circuit by interrupting excessive current flow

Answer

To increase the voltage in the circuit

Answer

To reduce the resistance in the circuit

Answer

To store electrical energy

Question 53

What is the fundamental difference between AC and DC electricity?

Accepted Answer

AC periodically reverses its direction of flow, while DC flows in only one direction

Answer

AC has higher voltage than DC

Answer

AC is used in batteries, while DC is used in power lines

Answer

DC can be stored in batteries, while AC cannot

Question 54

What is the main purpose of a transformer in an electrical system?

Accepted Answer

To change the voltage level of the electricity

Answer

To store electrical energy

Answer

To decrease the resistance in the circuit

Answer

To increase the current in the circuit

Question 55

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

Accepted Answer

To store electrical energy in its electric field

Answer

To protect the circuit from short circuits

Answer

To increase the voltage in the circuit

Answer

To reduce the current in the circuit