Question

Give two characteristics proporties of copper wire which make it unsuitable for use as fuse wire

Answer 1

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a pure copper wire cannot be used as a fuse wire because it has a high melting point due to which it will not melt easily when a short circuit take place.

the fuse wire must have a proper thickness which depend on Maximum current which the household wiring can safely carry. the fuse wire usually made from tin plated copper wire having low melting point so that it melt easily. we should not use thick wire has a fuse wire because it will have low resistance and hence it will not get heated to its melting point easily. we use thin wire in a fuse because it has much greater resistance than the rest of connecting wires. due to its high resistance the heating effect of current will be much more in the fuse wire than anywhere else in the current.




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Answer 2

Answer:

Explanation:

1. copper has high melting point. Hence it won’t melt completely and hence short-circuit occurs.

2. copper wire is thick . ⍴xl / A = R

let ^ mean increase and -^ mean decrease.

from equation if A^ Then R-^.

more thickness => less resistance

hence fuse wire ( copper) won’t get heated to its melting point easily.

thin wires have greater resistance than  rest of wires.

Due to this , the heating effect of current Will be much more effective in the fuse wire than anywhere else in circuit.

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