How to convert resistance value at 20 degree to 90 degree?

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How to convert resistance value at 20 degree to 90 degree?..

Ro -resistance at o degre centigrade
Rt -resistance at t degre centigrade
we have formula
Rt = Ro(1+alpha t)
here alpha is cofficient of resistivity

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How to convert resistance value at 20 degree to 90 degree?..

Answer / anand

Rt = Ro(1+alpha *Delta t)

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