1. Description of how temperature affects the resistance of the thermistor: 

• As the temperature increases, the resistance of the thermistor decreases.
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• As the temperature decreases, the resistance of the thermistor increases.

    2. The symbol for a thermistor is:

    3. a) Central heating controller uses a thermistor.

        b) Digital cameras do not use a thermistor.

        c) Burglar alarms do not use a thermistor.