K.C.S.E Physics Q & A - MODEL 1996PP1QN12

K.C.S.E Physics Q & A - MODEL 1996PP1QN12

​Thermistor, TH, is connected in parallel with a bulb as shown in figure 3. The bulb is lit. When the thermistor is steadily heated the brightness of the bulb reduces. Explain this observation 

ANSWERS

• As the thermistor is heated its resistance reduces/ conductivity  increases hence drawing more current through it;  hence  less current flowing through B;