Electrical 2 Module 2 Test Questions and Answers | Latest Version | 2024/2025 | Correct & Verified

Electrical 2 Module 2 Test Questions and Answers | Latest Version | 2024/2025 | Correct & Verified What should you do before working on any electrical system? Ensure that the power is turned off and the system is properly locked out and tagged out to prevent accidental energization. What is the function of a circuit breaker in an electrical system? A circuit breaker automatically shuts off electrical power when it detects an overload or short circuit, protecting the system from damage. Why is it important to use the correct wire size for electrical circuits? Using the correct wire size prevents overheating and reduces the risk of electrical fires due to excessive current. How do you determine the correct wire gauge for a circuit? The wire gauge is determined by the current rating of the circuit, the length of the wire, and the type of installation. 2 What is the purpose of a fuse in an electrical circuit? A fuse provides overcurrent protection by blowing if the current exceeds a safe level, preventing damage to the circuit. What is the difference between AC and DC current? AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction only. What is the purpose of a junction box in electrical wiring? A junction box protects electrical connections, prevents electrical shock, and provides a safe area for wire splicing or connections. Why should electrical connections be properly tightened? Loose connections can cause overheating, arcing, and potential fire hazards. Properly tightened connections ensure safe and reliable operation. What is the standard voltage for most residential electrical systems in the United States? 120 volts for standard outlets and 240 volts for large appliances like dryers and ovens. 3 What is the importance of using electrical tape in wiring installations? Electrical tape insulates connections and wires, protecting them from damage and reducing the risk of short circuits and electric shock. How can you safely test a circuit for power? Use a voltage tester or multimeter to check for the presence of electrical voltage, ensuring the circuit is safe to work on. What is a short circuit? A short circuit occurs when a live wire comes into direct contact with a neutral or ground wire, causing excessive current flow and potentially resulting in a fire. What does "overcurrent protection" mean in an electrical system? Overcurrent protection refers to devices like circuit breakers and fuses that protect electrical circuits from damage caused by excessive current. What is the function of a transformer in an electrical system? A transformer changes the voltage level in an electrical system, either stepping up or stepping down the voltage for distribution or use. 4 How do you ensure proper ventilation when installing electrical equipment? Ensure that electrical equipment is not obstructed and has adequate airflow to prevent overheating and potential failure. What is the purpose of a grounding electrode system? A grounding electrode system provides a connection between the electrical system and the earth, helping to dissipate electrical energy safely in case of a fault. What is the function of an electrical panel? An electrical panel distributes electrical power to different circuits within a building and houses circuit breakers or fuses to protect each circuit. Why is it important to use only UL-listed electrical devices and equipment? UL-listed devices have been tested for safety and meet industry standards, reducing the risk of electrical hazards and failures.