Question

Constanton wire is used in making standard resistances, because its :-

• A. specific resistance is low
• B. density is high
• C. temperature coeff. of resistance is negligible
• D. melting point is high

Answer 1

The correct option is C temperature coeff. of resistance is negligible

Constantan is an alloy which is used for making standard resistance coils because of high resistivity and low temperature coefficient of resistance. Value of resistance does not change much with the use/ temperature rise with use(current flowing through it)