1 The NTC-type thermistor (NTC-negative thermal coefficient) has the characteristic curve shown below. (a) (b) (c) (c) Resistance (ks) 8- 7- 6- 10 4- 3- 2- I 0 10 20 30 40 50 60 70 80 90 Temperature (°C) What is the temperature when the resistance of the thermistor is 5 k2? What is the resistance of the thermistor when the temperature is 80°C? Determine the value of the variable resistor that gives an output voltage of 3.0 V when the temperature is 80°C. [Ans: 2000 2] Resistance = What happens to the value of the output voltage as the temperature falls and the Them variable resistor remains at a fixed value? Explain your answer.

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Photoconductive Cell

Photoconductive cells are light-sensitive resistors in which resistance is inversely proportionated to light intensity when illuminated. These devices consist of a thin single-crystal or polycrystalline film of composite semiconductor materials. Cadmium sulfide (CdS) is used to make the most commercially available photoconductive particles which are sensitive to light in the visible spectrum. Other less commonly used substances respond to infrared light, but not to the visible spectrum. Such substances are lead sulfide (PbS), lead selenide (PbSe), and lead telluride (PbTe), and so on.