Question

Two wires of equal cross sectional area , one of copper and other of manganin have the same resistance . Which one will be longer?

Answer 1

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The copper wire will be 24.7 times as long because Manganin’s resistance is 24.7 times as great as that of pure copper. The advantage of Manganin over copper is that it has a lower temperature coefficient of resistance, meaning that its ohm value changes much less than that of copper with a change in temperature. This is important to the manufacture of precision resistors, particularly those used as shunts in ammeters and wattmeters.

I believe that there are two substances at normal temperatures that have lower resistance than copper, Silver and Graphene.