The temperature coefficient of resistances, Temperature Coefficient of Resistances
(TCR), shows the dependence of the resistance value on temperature. In general, the temperature dependence of resistors is linear. That is, the resistance value increases linearly as the temperature increases, which is causally related to the movement of free electrons in the resistor. The higher the temperature increases, the more restricted the movement becomes. At extremely low temperatures, a temperature is reached at which the transition from conductor to superconductor
occurs in some metals. The Temperature Coefficient of Resistance (TCR) results from the specific resistance of the metal, the amplitude of the atomic movement, the temperature and - inversely proportional - from the free electrons.