For safety, the fuse wire used in the mains for household supply of electricity must be made of metal…
The fuse wire needs a low melting point so that excessive current melts it and breaks the circuit. Current produces heat in the wire, and the fuse must open before dangerous…
Choose your answer
For safety, the fuse wire used in the mains for household supply of electricity must be made of metal having.
Answer and explanation
Correct answer D
The fuse wire needs a low melting point so that excessive current melts it and breaks the circuit. Current produces heat in the wire, and the fuse must open before dangerous overheating damages the household wiring. A high melting point would delay that protective action; resistance or specific heat alone does not ensure that the wire will melt safely.
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