Physics for IGCSE & O level - Electricity (Section 7 - No. 36)
What is the purpose of the earth (grounded) wire?
To carry the current back to the source.
To protect the circuit from over voltage.
To provide a low-resistance path to the ground in case of a fault.
To increase the voltage
Explication
The earth (grounded) wire provides a path for current to flow to the ground in case of a fault, preventing electric shock.