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i was doing a practical experiment using NTC thermistor. I recorded the resistance at different voltages (1v, 2v, 3v, etc) and to find the temperature i need to use the temperature coefficient formula "The Steinhart-Hart equation":

R(T) = R(T0) * [ 1 + a(T - T0) ]

where

T0 = reference temperature (deg Celsius)

T = temperature of interest (deg Celsius)

R(T0) = resistance at reference temperature (ohm)

R(T) = resistance at temperature of interest (ohm)

a = temperature coefficient of resistivity (1/deg Celsius)

i am confused to how calculate the temperature.

i know: T0 = room temperature (20 degrees C)

a = for copper wire is 0.004041

T = is what im trying to find

R(T0) = ?? my thermistor says "resistance value to be 2kΩ" is this the value of R(T0)?

R(T) = this is the resistance value i get when passing current through copper wire

in some books i've seen the values of T to be in kelvin and sometimes in celcius. which is the correct way in this case? and instead of resistance some books replace it with "rho" for resistivity.

please help

does anyone know where i can find some example worked questions to understand this.

Slim

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# Calculating temperature using NTC thermistor

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