Two fuse wires are rated $5 A$ and $20 A$ . Which of the two fuse wires are thicker and why?

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Solution

1. A fuse wire $20 A$ is thicker and carries more current than $5 A$ because $20 A$ fusewire has less resistance for the same length and same material.
2. The fuse wire flows more current in less heat before melting in the circuit.

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