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What is the unit of temperature coefficient?(a) ohm/centigrade(b) ohm-centigrade(c) centigrade^-1(d) centigradeI had been asked this question in semester exam.This interesting question is from Temperature Coefficient of Resistance topic in portion Simple DC Networks of Basic Electrical Engineering

Answer»

The correct answer is (c) centigrade^-1

To ELABORATE: R=Reff[1+temp. coeff(T-Teff)].

From the GIVEN EXPRESSION: (R/Reff-1)/(T-Teff) = temp. coeff. HENCE, the UNIT is the reciprocal of that of temperature = centigrade^-1.



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