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Question

If R1 and R2 are the resistance of a conductor at two temperatures t01C and t02C respectively, show that the temperature coefficient of resistance,α=R2R1R1t2R2t1

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Solution

Given R1 and R2 are the resistance of a conductor at two temperatures t01C and t01C respectively.

We know that the resistance of a conductor varies with temperature as,

Rt=R0(1+t)

R0 resistance at 0C,Rtto resistance at tC

temperature coefficient of resistance

We have R1=R0(1+t1)fort1C

And R2=R0(1+t2)fort2C

Taking ratio, =R2R1=R0(1+t2)R0(1t1)

We get, R2+R2t1=R1+R1t2

(Or)=R2R1R1t2R2t1


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