Question

what is temperature coefficient of resistance??

Answer 1

The resistance-change factor per degree Celsius of temperature change is called the temperature coefficient of resistance. This factor is represented by the Greek lower-case letter “alpha” (α). A positive coefficient for a material means that its resistanceincreases with an increase intemperature.

Answer 2

 The resistance Rt of a metal conductor at temperature t0C is given by :
Rt = R0 ( 1 + αt + βt2)
Where α and β are temperature coefficients of resistance. R0 is the resistance of conductor at 00C.
It the temperature t0C is not sufficiently large, the above relation may expressed as :
Rt = R0 ( 1 + αt )
α = Rt − R0R0  X t = increase in temperature original temperature X rise of temp.
Thus, temperature coefficient of resistance is defined as the increase in resistance per unit original resistance per degree rise of temperature.


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