In the circuit above, the processor (a transistor) is switched on when the voltage between terminals E and B is more than 0.6 V. This means that a current can then flow between E and C. so the lamp will light up.

a. The circuit includes a thermistor. If there is an increase in temperature, what effect does this have on the thermistor?

b. The thermistor and the 10 kΩ resistor form a potential divider. What is the purpose of a potential divider?

c. If there is an increase in temperature, how does this affect the voltage between E and B, and what happens as a result?

d. How could the circuit be improved so that it can control a more powerful lamp (or butter, or bell)?

e. What practical use could be made of the system described above?

Transcribed Image Text:

thermistor T I 6V 1 ka processor E 10 k2 B.