NCCER Electrical Level 1: Module 3 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified

NCCER Electrical Level 1: Module 3 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified Why should you turn off power before working on electrical systems? To prevent electrical shock. What is a GFCI outlet? An outlet that protects against electrical shock by cutting off power if a fault is detected. Why is wire stripping important? It removes insulation to expose the conductor for connections. What does a fuse do? It breaks the circuit if the current exceeds a safe level. What is the function of a multimeter? It measures voltage, current, and resistance in circuits. 2 Why is it important to use the correct wire gauge? To prevent overheating and ensure safety. What is a junction box used for? To house electrical connections and prevent fire hazards. What is the difference between AC and DC power? AC alternates direction, while DC flows in one direction. Why is grounding important? It prevents electrical shock by directing fault currents to the earth. What is the role of a circuit tester? To check if a circuit is live and functioning properly. Why should you check for continuity? To ensure that electrical connections are intact and current can flow. 3 What does an arc fault circuit interrupter (AFCI) do? It detects and stops dangerous electrical arcs that could cause fires. Why use electrical tape? To insulate wire connections and prevent shorts. What should you do if a breaker trips? Investigate the cause, fix the issue, then reset the breaker. What is the purpose of an electrical panel? To distribute electricity and protect circuits with breakers. Why should wires be properly secured in conduit? To prevent damage and ensure safe operation. How do you know if a wire is damaged? Look for exposed conductors, fraying, or burn marks.