MAINS ELECTRICITY
1 mark · EasyState the role of the earth wire in a domestic mains circuit.
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To protect the user by providing a path to earth if there is a fault.
Also accept: Provides a path for current to flow safely to earth if there is a fault.; Protects the user from electric shock by sending excess current to earth.
Common mistakes: It supplies electricity.; It completes the circuit.
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Marking points
B1 · 1 mark · States that the earth wire protects the user by giving a path for current to flow to earth if there is a fault.
Worked solution
The earth wire protects the user by providing a low-resistance path for current to escape to earth if a fault occurs.