Physics for IGCSE & O level - Electricity (Section 10 - No. 42)
What is the role of the earth wire in a household electrical system?
To carry excess current back to the source
To provide a low-resistance path to ground
To supply the electrical energy
To switch the circuit on or off
คำอธิบาย
The earth wire provides a low-resistance path to the ground, providing a safety mechanism in case of a fault.