Question

Why is constantan or manganin used for making standard resistors?

Answer 1

Manganin foil and wire is used in the manufacture of resistors, particularly ammeter shunts, because of its virtually zero temperature coefficient of resistance value and long term stability. Several Manganin resistors served as the legal standard for the ohm in the United States from 1901 to 1990.

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Answer 2

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Alloys like constantan and manganin are used to make standard resistence coils because ;>

>They have a very high value of resistivity .

>They have a very small temprature coeffiient of resistivity Thus their value of resistivity does not change even for high values of temprature.

>They are least affected by atmospheric condition like temprature ,moisture,air ,etc etc...

>the contact potential with alloys with copper is very small.