When I did an experiment measuring the Resistance of a thermistor as I increase or decrease the temperature, when I plot the resistance (y - axis) against temperature (x-axis), I get an exponential decay curve. I know for sure that thermistors have an inverse relationship with temperature and resistance, however I do not know why my graph or experiments shows an exponential decay. Are there any mathematical relationship between resistance and temperature of a thermistor, or previous studies conducted showing the relationship?
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$\begingroup$ How do you know your curve is an exponential decay and not an inverse temperature decay? What uncertainty analysis did you do to verify this? $\endgroup$– Jeffrey J WeimerOct 30, 2021 at 18:53
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1 Answer
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The resistance of a thermistor changes with temperature. How much the resistance changes depends on the type of material used in the thermistor.
Unlike other sensors, thermistors are nonlinear, meaning the points on a graph representing the relationship between resistance and temperature will not form a straight line. The location of the line and how much it changes is determined by the construction of the thermistor.
