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An exploded view of a thermistor, showing details of the internals, and of the NCT itself.A thermistor is a resistor whose resistance varies in accordance with temperature. This makes thermistors suitable for use in devices for monitoring and measuring temperature, such as coolant temperature sensors.

Thermistors whose resistance rises with an increase in temperature are said to have a positive temperature coefficient (PTC), and the symbol is shown below on the right. Those whose resistance fall are said to have a negative temperature coefficient (NTC), and the symbol is shown on the left.

Thermistor in an automotive circuitSymbol for PTC thermistor

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Please note, if you want to contact the main Training Centre in Baldoyle, you need to ring 01-8167400.


If you want to contact the CP Fitters' Section, you can Contact Us by email, admin@cpfitters.info, or by telephone: 00 353 1 8167543 This number gets you through to the CP Fitters' Section, Baldoyle Satellite Unit.

Our Address is : Construction Plant Fitters' Section, Unit 116, Grange Way, Baldoyle Industrial Estate, Baldoyle, Dublin D13 CA48.
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