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PHYSICS

JAMB 2004 - Question 48

Physics 2004 JAMB Past Questions - Question 48: electrical appliances in homes are always earthed so that

Choose the most appropriate option for the gap .

electrical appliances in homes are always earthed so that

A: both the a.c and d.c sources can be used

B: a person touching the appliances is safe from electrical shock

C: the appliances are maintained at a higher p.d than the earth

D: the appliances are maintained at a lower p.d than the earth

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Correct Answer

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.