NCCER Electricity Module 3 Study Guide
Questions and Answers | Latest Version
| 2024/2025 | Correct & Verified
What is the purpose of an electrical panel?
✔✔ To distribute electrical power throughout a building and protect circuits with breakers.
Why should you use insulated tools when working with electricity?
✔✔ To prevent electric shock and ensure safety while handling live wires.
What does a circuit breaker do when it trips?
✔✔ It stops the flow of electricity to a circuit to prevent damage from overloads or short circuits.
What is the role of a fuse in an electrical circuit?
✔✔ To protect the circuit by blowing when the current exceeds a safe level.
How do you test a wire with a multimeter?
✔✔ Set the multimeter to the correct setting and check the continuity or voltage across the wire.
1
, What should you check before installing a new circuit?
✔✔ Ensure the circuit is designed to handle the load, and confirm the breaker size and wire
gauge are correct.
What is the primary function of an electrical meter?
✔✔ To measure electrical quantities like voltage, current, and resistance.
Why is it important to size the wire properly for a circuit?
✔✔ Proper wire size ensures the wire can safely carry the expected electrical current without
overheating.
How does an electrical transformer work?
✔✔ It changes the voltage of electricity, stepping it up or down as needed for distribution or use.
What safety precautions should be taken when working with electrical systems?
✔✔ Always turn off power, use insulated tools, and wear proper protective gear.
What is the purpose of a junction box?
2
Questions and Answers | Latest Version
| 2024/2025 | Correct & Verified
What is the purpose of an electrical panel?
✔✔ To distribute electrical power throughout a building and protect circuits with breakers.
Why should you use insulated tools when working with electricity?
✔✔ To prevent electric shock and ensure safety while handling live wires.
What does a circuit breaker do when it trips?
✔✔ It stops the flow of electricity to a circuit to prevent damage from overloads or short circuits.
What is the role of a fuse in an electrical circuit?
✔✔ To protect the circuit by blowing when the current exceeds a safe level.
How do you test a wire with a multimeter?
✔✔ Set the multimeter to the correct setting and check the continuity or voltage across the wire.
1
, What should you check before installing a new circuit?
✔✔ Ensure the circuit is designed to handle the load, and confirm the breaker size and wire
gauge are correct.
What is the primary function of an electrical meter?
✔✔ To measure electrical quantities like voltage, current, and resistance.
Why is it important to size the wire properly for a circuit?
✔✔ Proper wire size ensures the wire can safely carry the expected electrical current without
overheating.
How does an electrical transformer work?
✔✔ It changes the voltage of electricity, stepping it up or down as needed for distribution or use.
What safety precautions should be taken when working with electrical systems?
✔✔ Always turn off power, use insulated tools, and wear proper protective gear.
What is the purpose of a junction box?
2
