Why are constantan and manganin used for making standard resistance?
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Alloys like constantan and manganin are used to make standard resistance coils because: 1. They have a very high value of resistivity. ... They have a very small temperature coefficient of resistivity.
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The standard resistance coils are made of constantan and manganin.
This is because,
1. the variation of resistivity with temperature is very small and,
2. the resistivity of constantan and manganin is very high and any desired resistance can be made with convenient dimensions of the material.
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