iGCSE Physics (0625) 4.4 Electrical safety Paper 1-2023,2024 & 2025

Question

The current in a kettle is 10 A and the kettle is protected by a 13 A fuse.

The owner of the kettle replaces the 13 A fuse with a 3 A fuse.

What happens when the kettle is switched on?

    1. The fuse melts and the kettle might be damaged.

    2. The fuse melts and the kettle is undamaged.

    3. The fuse does not melt and the kettle works correctly.

    4. The fuse does not melt but the kettle fails to work.

Answer/Explanation

Ans: B

Question

A circuit-breaker is designed to protect a circuit which usually carries a current of 2 A.

The time taken to break the circuit depends on the current, as shown in the graph.

     

What happens when the current in the circuit is 2 A and what happens when the current is 18 A?

 

when the current is 2 A

when the current is 18 A

A

the circuit breaks in less than 0.01 s

the circuit breaks in less than 0.01 s

B

the circuit breaks in less than 0.01 s

the circuit does not break

C

the circuit does not break

the circuit breaks in less than 0.01 s

D

the circuit does not break

the circuit does not break

Answer/Explanation

Ans: C

Question

A domestic circuit includes a 30 A fuse. This protects the wiring if there is too much current in the circuit.

In which wire is the 30 A fuse positioned, and what does it do when it operates?

 

position

operation

A

live wire

disconnects the circuit

B

live wire

reduces the current to 30 A

C

neutral wire

disconnects the circuit

D

neutral wire

reduces the current to 30 A

Answer/Explanation

Ans: A

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