A fuse is an electrical safety device designed to protect an appliance from excessive current.
Which statement correctly describes how a fuse operates when the current passing through it exceeds its rated value?
The fuse wire melts, which breaks the circuit and completely stops the current.
The fuse wire increases its resistance, which reduces the current to the correct value.
The fuse wire expands and diverts the excess current to the earth wire.
The fuse wire magnetises, pulling a switch open to temporarily halt the current.
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.