For a negative temperature coefficient (NTC) thermistor (the type used at IGCSE):
- As temperature increases, resistance decreases.
- The I-V characteristic is non-linear.
Thermistors are used in temperature-sensing circuits, thermostats, fire alarms, and baby incubators.
In a potential divider circuit with a fixed resistor, the output voltage changes as the thermistor’s resistance changes with temperature, providing an electronic temperature signal.
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