Inferred absolute zero temperature:



In a temperature-resistance curve of a metal (such as copper) the resistance gradually increases with the increase of temperature. Temperature has a profound effect on resistance and hence it is important that we determine a method to find the resistance at any temperature within the limit of operation.  Although the temperature-resistance curve is not a straight line, we draw a best fit straight line to find the resistance at normal operating temperature range.


Figure: Temperature-Resistance curve of copper and inferred absolute zero temperature.


Although the actual curve extends to absolute zero (-273.15°C, or 0 K), the straight-line approximation is quite accurate for the normal operating temperature range.

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