O-LevelPhysicsElectricity5054/11 · May/June 2010 · Q311 Mark
The metal case of an electric heater is earthed. The plug to the heater contains a 5 A fuse. There is a current of 4 A when the heater works normally. The cable to the heater becomes so worn that the live wire makes electrical contact with the case. What happens?
AThe current flows to earth and the fuse is not affected.
BThe fuse melts and switches off the circuit.
CThe metal case becomes live and dangerous.
DThe metal case becomes very hot.
✓ Correct answer
B: The fuse melts and switches off the circuit.
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