a. Using the characteristics of Fig. 3.38, determine the resistance of the photoconductive cell at 10 and 100 foot- candles of illumination. As in Problem 1, note that it is a log scale.
Problem 1
a. Find the resistance of the thermistor having the characteristics of Fig. 3.36 at −50°C, 50°C, and 200°C. Note that it is a log scale. If necessary, consult a reference with an expanded log scale.
b. Does the thermistor have a positive or a negative temperature coefficient?
c. Is the coefficient a fixed value for the range −100°C to 400°C? Why?
d. What is the approximate rate of change of ρ with temperature at 100°C?
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