Question

Which is the correct formula for the resistance Rt of a metallic conductor at any temperature t?

(a) Rt = Ro(ɑt-1)

(b) Rt = Ro(1-ɑt)

(c) Rt = Ro(1+ɑt)

(d) Rt = Ro(10+ɑt)

The question was posed to me in class test.

This intriguing question comes from Essential Parameters for Telemedicine in portion Telemedicine Technology of Biomedical Instrumentation

Answer 1

Correct option is (c) Rt = Ro(1+ɑt)

To explain I would say: The resistance Rt of a metallic conductor at any temperature t is given by Rt = Ro(1+ɑt). Ro is the resistance at 0*C. ɑ is a temperature coefficient of resistivity.