Electrical appliances at home are normally earthed so that?
- the appliances are maintained at a lower p.d than the earth
- both the a.c and d.c sources can be used
-
a person touching the appliances is safe from electric shock
- the appliances are maintained at a higher p.d than the earth
The correct answer is: C
Explanation
Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.