Temperature Coefficient of Resistance

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

\( R = R_{ref}  \; [1+ \alpha \; (  T - T_{ref} ) \; ]  \) 
Symbol English Metric
\( R \) = resistance at temperature \(T\) \(\Omega\)  \(kg-m^2\;/\;s^3-A^2\) 
\( R_{ref}  \) = resistance at temperature \(T_{ref} \) \(\Omega\)  \(kg-m^2\;/\;s^3-A^2\) 
\( \alpha \)  (Greek symbol alpha) = temperature coefficient of resistance of the material \(F\) \(C\)
\(T  \) = material temperature in celcius \(F\) \(C\)
\( T_{ref} \) = reference temperature for which the temperature coefficient is specified \(F\) \(C\)

 

Temperature coefficient of resistance material

Material / Substance Temperature 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

 

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Tags: Coefficient Electrical