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Characteristics of Thermistor
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Procedure

 

 For Real Lab

 

  • Connections are made as shown in the figure.
  • Place the thermistor in an oil bath using the heating arrangement.   
  • Note the room temperature (T0).                                                                                                
  • Turn on the power supply and fix to a constant voltage.
  • Note the current readings using a digital multimeter or a milliammeter.
  • Corresponding resistance is found , using equation «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»R«/mi»«mo»=«/mo»«mfrac»«mi»V«/mi»«mi»I«/mi»«/mfrac»«/math» and is noted as R0.
  • Vary the temperature of the oil bath using the heating arrangement.
  • Note the current readings at regular intervals of temperatures.
  • Corresponding resistances R is found using the same equation.
  • From the readings, logR-logR0, 1/T-1/T0 is calculated. 
  • Value of β is calculated from equation    «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»§#946;«/mi»«mo»=«/mo»«mfrac»«mrow»«mi mathvariant=¨normal¨»log«/mi»«mi»R«/mi»«mo»-«/mo»«mi mathvariant=¨normal¨»log«/mi»«msub»«mi»R«/mi»«mn»0«/mn»«/msub»«/mrow»«mrow»«mfrac»«mn»1«/mn»«mi»T«/mi»«/mfrac»«mo»-«/mo»«mfrac»«mn»1«/mn»«msub»«mi»T«/mi»«mn»0«/mn»«/msub»«/mfrac»«/mrow»«/mfrac»«/math»
  • Temperature coefficient of resistance is found from the equation, «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»§#945;«/mi»«mo»=«/mo»«mo»-«/mo»«mfrac»«mi»§#946;«/mi»«msup»«mi»T«/mi»«mn»2«/mn»«/msup»«/mfrac»«/math».
  • Repeat the experiment for another voltage.

 

For Simulation

 

  • Click on ‘show circuit diagram’ for displaying the circuit.
  • Place the mouse pointer over the components and click to drag wire.
  • After getting connected,click on ‘Power On ‘button in the variables region to start and maintain a constant voltage.
  • Select the desired room temperature and choose any thermistor from drop down menu.
  • Corresponding current reading is shown in milliammeter.
  • Resistance for that value of voltage is found out using equation,«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»R«/mi»«mo»=«/mo»«mfrac»«mi»V«/mi»«mi»I«/mi»«/mfrac»«/math»
  • Increase the temperature using the slider shown in variables region.
  • Repeat the experiment for different values of voltages and different thermistors.

 

 Observations

 

 

Result

 

The material constant of thermistor,ß=

 

The temperature coefficient of thermistor,α=..........(K-1)

 

Cite this Simulator:

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