O-LevelPhysicsElectricity5054/11 · Oct/Nov 2010 · Q311 Mark

Many electrical appliances have metal cases. To prevent the case from becoming 'live', with the possibility of an electric shock, the earth wire of the electric cable is attached to the case. How does the earth wire prevent an electric shock?

AIt allows a current to flow to earth, so that the appliance continues working.

BIt allows a large current to flow to earth, blowing the fuse.

CIt prevents the fuse from blowing.

DIt reduces the current to a safe level.

✓ Correct answer

B: It allows a large current to flow to earth, blowing the fuse.

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2010 Paper 1 Variant 1, question 31.

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