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2.2 Analogue electronics. Resistors (8) Special resistors

Thermistors change resistance as temperatures change. Most thermistors have a negative temperature coefficient (NTC), meaning their resistance falls as temperature increases. Thermistors are used in temperature-sensing circuits.

 

            

There are thermistors with a positive temperature coeficient (PTC)

 

Light-dependent resistors (LDRs) change resistance as light levels change. The light levels are detected by a photo-sensitive plate on the resistor. Most LDRs have a negative light coefficient, meaning that their resistance falls as the amount of light falling on them increases. LDRs are used in light-detection circuits.

        

Exercise 25.Explain how the special resistor works as in the model:

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