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Phys2Lab6 - with a thermometer Begin heating water and...

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Matthew Malek Lab Partners: Jon and Christina Lab #6 10/01/2006 Thermister Objectives: To develop a calibration for a thermistor, to use the calibration curve to measure the temperature of some common substances, and to determine the equation of the calibration curve. Theory : A device made of semi-conducting material, which has a resistance which is very sensitive to temperature is a thermistor. The hotter the temperature the higher the resistance increases. And the same is true for the opposite. Over a given temperature the resistance of a thermistor can be described as: R = R o e^ ß (1/T-1/To) If you want an equation with a straight line graph: Ln R = ln Ro + ß (1/T-1/To) Procedure : Connect thermistor to ohm meter and put ithe thermistor in water
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Unformatted text preview: with a thermometer. Begin heating water and taking readings of the temperature and resistance ever 5 degrees. Make a graph with this data of resistance vs 1/T. Conclusion From comparing our data table to our graph we see that is only applies over a certain range and we see this range is between temperatures 30 degrees and 70 degrees Celsius. After that it seems the resistance levels off. The slope of our graph represents the exponential temperature coefficient value. A lot of applications would need to know at what temperature you will get this resistance. When you power a circuit it creates heat and heat changes the resistance which in turn changes the circuit. This is a very useful device....
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