Question

Why constantan magnesium and nichrome make resistance?

Answer 1

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Apart from resistance, constantan is also used in thermocouples. Manganin is an improvement over constantan, discovered in 1892. It is an alloy of copper , manganese and nickel. Its temperature coefficient of resistanceis near zero, and this makes it ideal for ammeter shunt, and high precisionresistance.

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Answer 2

because they are used to make standard resistance coils