Temperature Coefficient of Resistance

Written by Jerry Ratzlaff on . Posted in Electrical Engineering

Temperature coefficient of resistance, abbreviated as \( R \), is the resistance of a conductor at any given temperature.

 

Temperature coefficient of resistance formula

\(\large{ R = R_{ref} \left(1+ \alpha \; \left(  T - T_{ref}  \right) \; \right)  }\)   

Where:

\(\large{ R }\) = resistance at temperature \(T\)

\(\large{ \alpha }\)  (Greek symbol alpha) = temperature coefficient of resistance of the material

\(\large{ R_{ref} } \) = resistance at temperature \(T_{ref} \)

\(\large{ T } \) = material temperature in celcius

\(\large{ T_{ref} } \) = reference temperature for which the temperature coefficient is specified

 

Temperature coefficient of resistance materials

Material / SubstanceTemperature coefficient of resistance / °C (at 20 °C)
Aluminum 0.00429
Brass 0.0015
Carbon -0.0005
Constantan 0.00003
Copper 0.00386
Germanium -0.05
Gold 0.0034
Iron 0.00651
Manganese 0.00001
Manganin 0.000002
Mercury 0.0009
Nichrome 0.0004
Nickel 0.00641
Platinum 0.003927
Silicon -0.07
Silver 0.0038
Tantalum 0.0033
Tin 0.0042
Tungsten 0.0045
Zinc 0.0037

Tags: Equations for Electrical