NCCER Electrical 2 Module 1 Questions
and Answers | Latest Version | 2024/2025
| Correct & Verified
What does the term "grounding" refer to in electrical systems?
✔✔Grounding is the process of connecting an electrical system to the earth to prevent electrical
shock and reduce the risk of electrical fires.
Why is it important to use the correct wire gauge for electrical circuits?
✔✔Using the correct wire gauge ensures that the wire can safely carry the intended electrical
load without overheating or causing a fire.
What is the purpose of a fuse in an electrical circuit?
✔✔A fuse protects electrical circuits by breaking the connection if the current exceeds a safe
level, preventing overheating and potential damage to the system.
What does the acronym "AC" stand for in electrical terminology?
✔✔AC stands for Alternating Current, which is a type of electrical current that reverses direction
periodically, commonly used in power distribution.
1
, What is the difference between a conductor and an insulator?
✔✔A conductor allows electricity to flow through it easily, while an insulator resists the flow of
electricity, protecting users from electric shocks.
What is the function of a GFCI (Ground Fault Circuit Interrupter)?
✔✔A GFCI detects differences between hot and neutral wires and disconnects the power if a
ground fault is detected, preventing electrical shock hazards.
What does "short circuit" mean in an electrical system?
✔✔A short circuit occurs when there is an unintended low-resistance connection between two
conductors, which can cause excessive current flow and damage to the system.
What is the purpose of a voltage tester?
✔✔A voltage tester is used to determine whether an electrical circuit or outlet is live, ensuring
that it's safe to work on.
What is the basic function of a transformer?
✔✔A transformer changes the voltage level of alternating current (AC) in a circuit, either
stepping it up or stepping it down as needed.
2
and Answers | Latest Version | 2024/2025
| Correct & Verified
What does the term "grounding" refer to in electrical systems?
✔✔Grounding is the process of connecting an electrical system to the earth to prevent electrical
shock and reduce the risk of electrical fires.
Why is it important to use the correct wire gauge for electrical circuits?
✔✔Using the correct wire gauge ensures that the wire can safely carry the intended electrical
load without overheating or causing a fire.
What is the purpose of a fuse in an electrical circuit?
✔✔A fuse protects electrical circuits by breaking the connection if the current exceeds a safe
level, preventing overheating and potential damage to the system.
What does the acronym "AC" stand for in electrical terminology?
✔✔AC stands for Alternating Current, which is a type of electrical current that reverses direction
periodically, commonly used in power distribution.
1
, What is the difference between a conductor and an insulator?
✔✔A conductor allows electricity to flow through it easily, while an insulator resists the flow of
electricity, protecting users from electric shocks.
What is the function of a GFCI (Ground Fault Circuit Interrupter)?
✔✔A GFCI detects differences between hot and neutral wires and disconnects the power if a
ground fault is detected, preventing electrical shock hazards.
What does "short circuit" mean in an electrical system?
✔✔A short circuit occurs when there is an unintended low-resistance connection between two
conductors, which can cause excessive current flow and damage to the system.
What is the purpose of a voltage tester?
✔✔A voltage tester is used to determine whether an electrical circuit or outlet is live, ensuring
that it's safe to work on.
What is the basic function of a transformer?
✔✔A transformer changes the voltage level of alternating current (AC) in a circuit, either
stepping it up or stepping it down as needed.
2
