Consider how the resistance change produced by a thermistor when
subject to a temperature change can be converted into a voltage change.
Figure 1.34 shows how a potential divider circuit can be used. A
constant voltage, of perhaps 6 V, is applied across the thermistor and
another resistor in series. With a thermistor with a resistance of 4.7 k~,
the series resistor might be 10 k~. The output signal is the voltage across
the 10 k.O resistor. When the resistance of the thermistor changes, the
fraction of the 6 V across the 10 k~ resistor changes.