Physics for IGCSE & O level - Electricity (Section 9 - No. 48)
Which of the following statements correctly describes the purpose of a ground wire?
To complete the circuit.
To carry the current back to the source.
To provide a low-resistance path for fault current.
To increase the voltage of the circuit.
解释
The ground wire provides a low-resistance path for fault currents to flow, improving safety by quickly tripping a circuit breaker or blowing a fuse.