# 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