IGCSE Physics – Electricity Practice Test

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A fuse is best described as what?

A safety device with a thin metal strip that will melt if too much current passes through a circuit causing a break in the current

A fuse is a safety device that protects circuits by interrupting current when it becomes too high. It contains a thin metal strip that heats up as current passes through. If the current exceeds the fuse rating, the strip melts and the circuit is opened, stopping the flow of electricity. This prevents wires from overheating and reduces the risk of damage or fire.

It’s not something that stores electrical energy, increases voltage, or cools components, so those descriptions don’t fit what a fuse does.

A device that stores electrical energy

A device that increases voltage

A device that cools components

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