Why are manganin and constantan used in standard resistors?
ATheir resistivity is very high
BThey are excellent insulators
CThey are cheap and very light
DResistance barely varies with heat
Answer & Solution
Correct answer: D. Resistance barely varies with heat
Manganin and constantan have a very weak dependence of resistivity on temperature, so a standard resistor made from them keeps a steady value.
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