A fuse is an electrical safety device designed to protect a circuit from excessive current. How does a fuse physically function to protect an appliance when the current exceeds the safety rating?
The fuse wire melts, which breaks the circuit and completely stops the flow of current.
The fuse wire expands and increases its resistance to reduce the current to the rated limit.
The fuse wire bends to redirect the excess current to the earth wire.
The fuse wire acts as an electromagnet to pull open a switch and break the circuit.
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.