Ncert Exercises & Solutions

Why are alloys used for making standard resistance coils?

Hint: The standard resistance coils require high resistance.

Step 1: Interpret the resistance of the alloys.

Alloys have a small value of temperature coefficient of resistance with less temperature sensitivity.

This keeps the resistance of the wire almost constant even in small temperature changes. The alloy also has high resistivity and hence high resistance for the given length and cross-section area of the conductor. (L and A are constant)

$R \propto ρ$

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