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The alloys constantan and manganin are u...

The alloys constantan and manganin are used to make standard resistance due to they have

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Independence of resistivity on temperature
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Why are constantan and manganin used for making standard resistances ?

(i) Define the term drift velocity . (ii) On the basis of electron drift , derive an expression for resistivity of a conductor in terms of number density of free electrons and relaxation time. On what factors does resistivity of a coductor depend ? (iii) Why alloys like constantan and manganin are used for making standard restores ?

Constantan wire is used in making standard resistances, because its :–

We use alloys for making standard resistors because they have

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