Question

The resistivity of constantan is 4.7 x 10-72m. Find
the resistance of a constantan wire of length 100 m
and diameter 0.2 mm.
(Ans. 1.496 k22)​

Answer 1

Answer:

Its resistivity (4.9 x 10−7 Ω·m) is high enough to achieve suitable resistance values in even very small grids, and its temperature coefficient of resistance is fairly low. In addition, constantan is characterized by good fatigue life and relatively high elongation capability.

0.37mm

An alloy of 60% copper 40% nickel. Size: 0.37mm dia.

The resistance of a given material is proportional to the length, but inversely proportional to the cross-sectional area. Thus resistivity can be expressed using the SI unit "ohm metre" (Ω⋅m) — i.e. ohms divided by metres (for the length) and then multiplied by square metres (for the cross-sectional area).

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