Electrical Module 1 Review Questions
and Answers | Latest Version | 2024/2025
| Correct & Verified
What is the primary purpose of a circuit breaker in a home electrical system?
✔✔A circuit breaker automatically shuts off the power to a circuit if it detects an overload or
short circuit, protecting the system from damage.
What type of wiring should be used for outdoor electrical installations?
✔✔Outdoor electrical installations should use weather-resistant cables like UF (underground
feeder) wire or THWN, which are rated for outdoor exposure.
What is the difference between a hot wire and a neutral wire in an electrical circuit?
✔✔The hot wire carries the current to the device, while the neutral wire completes the circuit by
returning the current to the panel.
What happens when a wire is overloaded with too much current?
✔✔When a wire is overloaded, it heats up, which could lead to a fire or melting of the
insulation, potentially damaging the system.
1
, How does an electrical transformer work to change voltage?
✔✔An electrical transformer uses electromagnetic induction to step up or step down the voltage
in an alternating current (AC) circuit.
What is the function of a fuse in a circuit?
✔✔A fuse prevents excessive current from flowing by breaking the circuit when the current
exceeds a safe limit, protecting the electrical devices connected to it.
Why is it important to install a grounding system in a building?
✔✔A grounding system helps prevent electrical shock hazards by providing a safe path for
electricity to flow into the earth in case of a fault.
What does the term "short circuit" mean?
✔✔A short circuit occurs when the current bypasses the load (like a light bulb) due to a low-
resistance path, causing excessive current flow and potential damage.
What is the purpose of electrical conduit in construction?
✔✔Electrical conduit protects wires from physical damage and provides a safe, organized way to
route electrical cables through a building.
2
and Answers | Latest Version | 2024/2025
| Correct & Verified
What is the primary purpose of a circuit breaker in a home electrical system?
✔✔A circuit breaker automatically shuts off the power to a circuit if it detects an overload or
short circuit, protecting the system from damage.
What type of wiring should be used for outdoor electrical installations?
✔✔Outdoor electrical installations should use weather-resistant cables like UF (underground
feeder) wire or THWN, which are rated for outdoor exposure.
What is the difference between a hot wire and a neutral wire in an electrical circuit?
✔✔The hot wire carries the current to the device, while the neutral wire completes the circuit by
returning the current to the panel.
What happens when a wire is overloaded with too much current?
✔✔When a wire is overloaded, it heats up, which could lead to a fire or melting of the
insulation, potentially damaging the system.
1
, How does an electrical transformer work to change voltage?
✔✔An electrical transformer uses electromagnetic induction to step up or step down the voltage
in an alternating current (AC) circuit.
What is the function of a fuse in a circuit?
✔✔A fuse prevents excessive current from flowing by breaking the circuit when the current
exceeds a safe limit, protecting the electrical devices connected to it.
Why is it important to install a grounding system in a building?
✔✔A grounding system helps prevent electrical shock hazards by providing a safe path for
electricity to flow into the earth in case of a fault.
What does the term "short circuit" mean?
✔✔A short circuit occurs when the current bypasses the load (like a light bulb) due to a low-
resistance path, causing excessive current flow and potential damage.
What is the purpose of electrical conduit in construction?
✔✔Electrical conduit protects wires from physical damage and provides a safe, organized way to
route electrical cables through a building.
2
