Building Trades Electrical

Front

What is the standard voltage for residential electrical systems in the United States?

Back

120 volts

Front

What is the purpose of a ground fault circuit interrupter (GFCI) outlet?

Back

To quickly shut off power to prevent serious injury from an electrical shock caused by ground faults or current leakage.

Front

What is the difference between a series circuit and a parallel circuit?

Back

The main difference is how components are connected: series circuits have components connected in a single path, while parallel circuits have components connected in multiple paths.

Front

What is the function of a circuit breaker in an electrical system?

Back

The function of a circuit breaker in an electrical system is to protect the circuit from damage caused by excess current flow.

Front

What is the role of a junction box in electrical wiring?

Back

The role of a junction box in electrical wiring is to provide a safe enclosure for electrical connections and protect against electrical hazards.

Front

What is the purpose of a three-way switch in a lighting circuit?

Back

To control a single light fixture from two different locations

Front

What safety precautions should be taken when working with electrical wiring?

Back

Turn off power supply, use insulated tools, wear rubber gloves and safety goggles, avoid wet conditions, follow wiring diagrams

Front

What is the purpose of a multimeter in electrical work?

Back

To measure electrical quantities such as voltage, current, and resistance in electrical circuits.

Front

What is the significance of the National Electrical Code (NEC) in building trades?

Back

The NEC is essential for establishing electrical safety standards and guidelines in building trades.

Front

How does an electrical conduit protect wiring in a building?

Back

By providing a physical barrier and organizing the wiring.