Electrical Theory for Construction: Master the Basics

Question 1

According to Ohm's Law, what is the formula to calculate voltage?

Accepted Answer

Voltage = Amperage x Resistance

Answer

Amperage = Voltage x Resistance

Answer

Resistance = Voltage x Amperage

Answer

Amperage = Resistance x Voltage

Question 2

In a parallel circuit, what happens to the overall resistance as more resistors are connected?

Accepted Answer

It decreases.

Answer

It increases.

Answer

It stays the same.

Answer

It fluctuates.

Question 3

Which electrical component is primarily responsible for controlling the flow of current in a circuit?

Accepted Answer

Switch

Answer

Resistor

Answer

Capacitor

Answer

Transformer

Question 4

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

Accepted Answer

To protect the circuit from excessive current

Answer

To regulate the voltage in the circuit

Answer

To store electrical energy

Answer

To convert AC to DC

Question 5

For grounding purposes in electrical systems, which type of wire is commonly used?

Accepted Answer

Bare copper wire

Answer

Insulated copper wire

Answer

Aluminum wire

Answer

Steel wire

Question 6

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

Accepted Answer

To increase or decrease voltage

Answer

To store electrical energy

Answer

To control the flow of current

Answer

To protect the circuit from overcurrent

Question 7

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

Accepted Answer

To store electrical energy

Answer

To regulate the flow of current

Answer

To protect the circuit from overcurrent

Answer

To convert AC to DC

Question 8

Which unit of measurement is used to quantify electrical current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 9

A circuit with only one path for current to flow is called a:

Accepted Answer

Series circuit

Answer

Parallel circuit

Answer

Combination circuit

Answer

Open circuit

Question 10

A transformer is primarily used to:

Accepted Answer

Increase or decrease voltage levels in a circuit

Answer

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

Answer

Protect against electrical hazards and faults

Answer

Control the speed and direction of electric motors

Question 11

Which of the following is considered a renewable energy source?

Accepted Answer

Solar power

Answer

Coal

Answer

Natural gas

Answer

Nuclear power

Question 12

The National Electrical Code (NEC) is a set of:

Accepted Answer

Regulations and standards for electrical installations and equipment

Answer

Guidelines for electrical safety practices

Answer

Codes for electrical contractors and professionals

Answer

Standards for electrical testing and inspection procedures

Question 13

Which material is NOT a conductor of electricity?

Accepted Answer

Rubber

Answer

Copper

Answer

Aluminum

Answer

Steel

Question 14

Precise Which SI unit measures electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Farad

Question 15

Clarified According to Ohm's Law, the voltage across a conductor is proportional to which factor?

Accepted Answer

Resistance

Answer

Current

Answer

Power

Answer

Energy

Question 16

Simplified Which circuit type allows current to flow through only one path?

Accepted Answer

Series circuit

Answer

Parallel circuit

Answer

Star circuit

Answer

Delta circuit

Question 17

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

Accepted Answer

Store electrical charge

Answer

Regulate voltage

Answer

Amplify current

Answer

Provide insulation

Question 18

Simplified Why is an electrical system typically grounded?

Accepted Answer

To prevent electrical shocks

Answer

To improve signal quality

Answer

To reduce power consumption

Answer

To increase circuit efficiency

Question 19

Adjusted Difficulty Which type of wire is commonly used for residential electrical wiring in the United States?

Accepted Answer

Romex

Answer

Thinner

Answer

BX

Answer

UF

Question 20

Clarified Explain the fundamental difference between AC and DC current.

Accepted Answer

AC changes direction while DC flows in one direction

Answer

AC has higher voltage than DC

Answer

DC is more efficient than AC

Answer

There is no difference

Question 21

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

Accepted Answer

Change voltage levels

Answer

Isolate circuits

Answer

Regulate current

Answer

Store energy

Question 22

According to Ohm's Law, which equation represents the relationship between voltage, current, and resistance?

Accepted Answer

Current = Voltage / Resistance

Answer

Voltage = Current / Resistance

Answer

Resistance = Voltage / Current

Answer

Power = Voltage * Current

Question 23

In an electrical circuit, what is the primary function of a resistor?

Accepted Answer

Decrease current flow

Answer

Increase current flow

Answer

Provide protection against short circuits

Answer

Store electrical energy

Question 24

Which type of electrical circuit has a single path for current to travel through?

Accepted Answer

Series circuit

Answer

Parallel circuit

Answer

Mixed circuit

Answer

Branch circuit

Question 25

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

Accepted Answer

Alter voltage levels

Answer

Convert AC to DC

Answer

Protect against electrical hazards

Answer

Accumulate electrical charge

Question 26

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

Accepted Answer

Copper

Answer

Rubber

Answer

Glass

Answer

Wood

Question 27

In an electrical system, what is the primary function of a ground wire?

Accepted Answer

Provide a safe path for excess current during faults

Answer

Prevent electrical shocks

Answer

Increase circuit voltage

Answer

Store electrical energy

Question 28

What is the key difference between single-phase and three-phase electrical systems?

Accepted Answer

Single-phase systems utilize one AC waveform, while three-phase systems utilize three AC waveforms

Answer

Three-phase systems utilize one AC waveform, while single-phase systems utilize three AC waveforms

Answer

Single-phase systems are primarily used for residential applications, while three-phase systems are used for industrial applications

Answer

Three-phase systems are primarily used for residential applications, while single-phase systems are used for industrial applications

Question 29

What is the SI unit for electrical resistance?

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Answer

Farad

Question 30

According to Ohm's Law, what is the electrical current in a conductor directly proportional to?

Accepted Answer

Voltage

Answer

Resistance

Answer

Power

Answer

Frequency

Question 31

In a series circuit, what is the path of the electrical current?

Accepted Answer

Single path

Answer

Multiple paths

Answer

Alternating paths

Answer

Random path

Question 32

Which tool is used to measure electrical current?

Accepted Answer

Ammeter

Answer

Voltmeter

Answer

Ohmmeter

Answer

Multimeter

Question 33

What is the desired insulation resistance for a wire?

Accepted Answer

Very high

Answer

Very low

Answer

Equal to the wire's resistance

Answer

Independent of the wire's length

Question 34

Which electrical grounding system connects grounding electrodes in a grid pattern?

Accepted Answer

Grid grounding

Answer

Radial grounding

Answer

Loop grounding

Answer

Plate grounding

Question 35

Which type of electrical conduit is made of metal?

Accepted Answer

Metallic conduit

Answer

Non-metallic conduit

Answer

Flexible conduit

Answer

Rigid conduit

Question 36

Which of the following is a distinguishing property of semiconductors?

Accepted Answer

Can be used as insulators or conductors

Answer

Low electrical conductivity

Answer

High thermal conductivity

Answer

Can be used in resistors

Question 37

In a series circuit, the total resistance is:

Accepted Answer

Equal to the sum of the individual resistances

Answer

Less than the sum of the individual resistances

Answer

Greater than the sum of the individual resistances

Answer

Cannot be determined

Question 38

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

Accepted Answer

To prevent excessive current flow

Answer

To increase the voltage

Answer

To act as a conductor

Answer

To store electrical energy

Question 39

What is the main function of a transformer?

Accepted Answer

To increase or decrease voltage

Answer

To convert AC to DC

Answer

To act as a switch

Answer

To store electrical energy

Question 40

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

Accepted Answer

Copper

Answer

Plastic

Answer

Wood

Answer

Rubber

Question 41

In the United States, what color is the neutral wire in a standard electrical system?

Accepted Answer

White

Answer

Black

Answer

Red

Answer

Green

Question 42

What is the main reason for having electrical safety guidelines?

Accepted Answer

To prevent electrical hazards

Answer

To make circuits work better

Answer

To make electrical repairs easier

Answer

To use less energy

Question 43

Which of the following is a common technique used for troubleshooting electrical circuits?

Accepted Answer

Using a multimeter to measure voltage, current, and resistance.

Answer

Replacing all electrical components simultaneously.

Answer

Ignoring safety precautions while troubleshooting.

Answer

Guessing which component is faulty without proper testing.

Question 44

Which of the following substances can conduct electricity?

Accepted Answer

Copper

Answer

Rubber

Answer

Plastic

Answer

Wood

Question 45

The standard unit for measuring electrical resistance is the:

Accepted Answer

Ohm

Answer

Ampere

Answer

Watt

Answer

Volt

Question 46

In a series circuit, electrical components are connected:

Accepted Answer

One after the other, forming a single path for current flow

Answer

In a combination of series and parallel connections

Answer

With no specific pattern or order

Answer

In parallel, with multiple paths for current flow

Question 47

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

Accepted Answer

V = I × R

Answer

R = V × I

Answer

V = I + R

Answer

I = V ÷ R

Question 48

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

Accepted Answer

Store electrical energy in an electric field

Answer

Amplify electrical signals

Answer

Conduct electricity without energy loss

Answer

Protect the circuit from overcurrent

Question 49

Grounding in an electrical system serves the purpose of:

Accepted Answer

Providing a safe path for fault currents to flow to the earth

Answer

Increasing the voltage level in the system

Answer

Improving the quality of electrical signals

Question 50

Which of the following energy sources is considered renewable?

Accepted Answer

Solar energy

Answer

Coal

Answer

Nuclear energy

Answer

Natural gas

Question 51

The primary purpose of an electrical code is to:

Accepted Answer

Establish safety guidelines for the installation and maintenance of electrical systems

Answer

Standardize electrical practices across different industries

Answer

Regulate the consumption of electricity by end-users

Answer

Promote energy efficiency measures