A fuse is connected in series with the live wire of an electrical appliance.
What happens physically inside the fuse when the current exceeds its rated limit, and what is the direct effect on the circuit?
The wire inside the fuse melts, breaking the circuit and stopping all current flow.
The fuse wire heats up and increases its resistance, lowering the current back to a safe level without breaking the circuit.
The fuse diverts the excess current directly to the earth wire while the appliance continues to run.
An electromagnet inside the fuse pulls a switch open, which can be reset later.
135 exam-style questions on CIE IGCSE Physics Electrical safety, covering Electrical safety. Each one has a worked solution and a mark scheme showing where the marks go.