NCCER Electrical Module 9 Questions
and Answers | Latest Version | 2024/2025
| Correct & Verified
What is the difference between a conductor and an insulator?
✔✔A conductor allows the flow of electrical current, while an insulator resists it.
Why is it important to follow wire color codes in electrical systems?
✔✔To ensure safety, consistency, and easy identification of circuit functions.
What is the purpose of a junction box?
✔✔To safely house electrical connections and protect them from damage or exposure.
What is the significance of the National Electrical Code (NEC)?
✔✔It provides safety standards for electrical design, installation, and inspection to prevent
hazards.
Why must electrical connections be made securely?
✔✔To ensure a reliable connection, prevent overheating, and reduce the risk of electrical fires.
1
, What is the purpose of a voltage tester?
✔✔To check for the presence of electrical voltage in a circuit or equipment.
What is an ampere a measure of?
✔✔The flow rate of electric current in a circuit.
Why is overcurrent protection necessary?
✔✔To prevent excessive current from damaging conductors, equipment, or causing fires.
What is the function of a transformer in an electrical system?
✔✔To change the voltage level in a circuit, either stepping it up or stepping it down.
What is the purpose of a wire nut?
✔✔To securely join and insulate two or more electrical wires.
Why is it important to use the correct size conductor for a circuit?
✔✔To ensure the conductor can safely carry the current without overheating.
2
and Answers | Latest Version | 2024/2025
| Correct & Verified
What is the difference between a conductor and an insulator?
✔✔A conductor allows the flow of electrical current, while an insulator resists it.
Why is it important to follow wire color codes in electrical systems?
✔✔To ensure safety, consistency, and easy identification of circuit functions.
What is the purpose of a junction box?
✔✔To safely house electrical connections and protect them from damage or exposure.
What is the significance of the National Electrical Code (NEC)?
✔✔It provides safety standards for electrical design, installation, and inspection to prevent
hazards.
Why must electrical connections be made securely?
✔✔To ensure a reliable connection, prevent overheating, and reduce the risk of electrical fires.
1
, What is the purpose of a voltage tester?
✔✔To check for the presence of electrical voltage in a circuit or equipment.
What is an ampere a measure of?
✔✔The flow rate of electric current in a circuit.
Why is overcurrent protection necessary?
✔✔To prevent excessive current from damaging conductors, equipment, or causing fires.
What is the function of a transformer in an electrical system?
✔✔To change the voltage level in a circuit, either stepping it up or stepping it down.
What is the purpose of a wire nut?
✔✔To securely join and insulate two or more electrical wires.
Why is it important to use the correct size conductor for a circuit?
✔✔To ensure the conductor can safely carry the current without overheating.
2
