Thermistors

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Thermistors
5mm
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Electric circuit symbol
Therm istor
resistor
Heat
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How is a thermistor affected by temperature?

• Measure its temperature
• For a range of temperatures how many?
• Measure its resistance - how?
• Display results how?

Thermistor mountedinside a glass tube
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Measuring its resistance
Use a digital multimeter easier than voltmeter
and ammeter.Measures resistance directly.
NOTE 20 k scale
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Gathering the data

• The thermistor will be heated in a water bath.
• The thermistor is in a glass tube to protect it
  from the water.
• Connect the wires to the multimeter using
  croc-plug connectors.
• Measure water temp with thermometer.
• Heat slowly to allow thermistor to come to the
  sametemperature as the water.

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Results and writing - up
Use the spreadsheet available on the
network.Double click applications-everyone
then go to Faculty resources/science/physics/sp
readsheet templates
spreadsheet
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The End