First slide

Temperature dependence

Question

A fuse wire should have

Easy

A

Low resistance and high melting point
B

Low resistance and low melting point.
C

High resistance and high melting point
D

High resistance and low melting point

Solution

Rate of heat generation is $i^{2} R$ . So for a given i more heat is generated if R is high. Also low melting point will let it to break when high current passes through it.

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