Why is manganin used for making standard resistors?

Why are Constantan and Manganin used for making standard resistors?

Why are constantan and manganin used for making standard resistances ?

Why are constantan and manganin used for making standard resistances ?

Answer the following: (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 ?

(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 ?

Why do we use manganin wire for making standard resistance?