Category Archives: Practical Electricity

February 5, 2012   O-level Units, Practical Electricity

Fuse Blowing

2011 GCE O Level Physics Paper 1 Question 33

An electrical cable contains three wires: live, neutral and earth. The cable is correctly wired to a plug which contains a 3A fuse. The insulation becomes damaged and bare metal wires show. Five possible events can occur.

• A person touches the earth wire
• A person touches the neutral wire
• A person touches the live wire
• The live wire touches the neutral wire
• The live wire touches the earth wire

How many of these five events cause the fuse in the plug to blow?

A. 1
B. 2
C. 3
D. 4

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