Temperature coefficients of different materials for calculating resistance
The temperature coefficient (temperature coefficient) of a resistor describes the change in its resistance value when the temperature changes from a reference temperature of 20 ° C
The following lists show the temperature coefficient of resistance of some materials at 20 °C
Aluminium (99,5 %) 0.004 Lead 0.0042 Iron (pure) 0.00657 Gold 0.0037 Copper (99,9 %) 0.00393 Nickel 0.006 Platinum 0.00392 Mercury 0.0009 Silver 0.0038 Tantalum 0.0033 Tungsten 0.0044
Aldrey (AlMgSi) 0.0036 Beryllium bronze (SnBe4Pb) 0.0005 Manganin (Cu84Ni4Mn12) ±0.00004 Constantan (CuNi44) ±0.00001 Isaohm ±0.000003 Brass(CuZn37) 0.0016 Soft iron (4 % Si) 0.0009 Steel C15 0.0057
Carbon -0.0005 Graphite -0.0002 Arc Coal 0.0005 Germanium -0.048 Silicon -0.075
In the case of the conductor materials that are important in electrical engineering, copper and aluminum in the temperature range 0 °C to 50 °C, the value 0.4% per °C can be calculated for estimates.
Commercially available low-power resistors have the usual temperature coefficients in the range from 0.0001 to 0.0002 (100ppm to 200 ppm) per °C, Precision resistances are in the range of 0.00005 (50 ppm) per °C.
The linear temperature coefficient is given in this case with the prefix TK, e.g. TK100 for a resistance with 100 ppm per °C.