The resistance of wire is noted a 10ohm at temp T1and 12ohm at temp T2 .Calculate the ratio of the resisting at Temp T1 and temp T2?
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Resistance of a resistor at temperature t0C is
Rt=R0(1+αt+βt2).
The temperature coefficient of resistance is given by:
Temperature coefficient of resistance=Rt1dtdR.
Temperature coefficient of resistance =R0(1+αt+βt2)R0dtd(1+αt+βt2)
Temperature coefficient of resistance=(1+αt+βt2)α+2βt.
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