It can easily measure the voltage drop of the current flowing through it. Therefore, a constantan wire is essentially an electrical resistance wire that can be used for heating. Thus, constantan is used in building chrome-constantan or iron-constantan thermocouples for temperature measurements.

Why is constantan wire used?

Constantan is an alloy of copper and nickel. ... Thus, the resistivity of constantan changes very little with temperature thus, making the values of resistivity, fairly constant. This property is very helpful in making standard wire-wound resistances for using in electrical circuits.

What are the uses of constantan?

Constantan is a copper/nickel alloy used in the production of thermocouples and thermocouple extension wires as well as precision resistors and low temperature resistance heating applications.