R Th = R p || R Th< R Th = R CdS + R Th< R Th = (R a +R Th1 < )||(R b +R Th2 < ) R Th = (R 1 + R Th< ) || R 2 +R Th< +R Th< Resistor: parallel R p G= R p R p Resistor: variable (CdS Photocell) R CdS R a R b Potentiometer R 1 R 2 R 1 R 2 V-Divider G = R 2 R 1 +R 2 +R Th<Tot R Th<Tot = R Th1< +R Th2< +R Th<Tot +R Th2< +R Th1< G 1 = R pot R pot R b R a G 2 = R pot = R a + R b 6 8 5 7 R Th =R Th< R Th = R + R Th< R Th =R Th< R Th = R T + R Th< v s1 Resistor Voltage Source R v s2 R T Voltage Source Resistor: variable (Thermistor) 1 3 2 4 15.2 15.2 15.2 15.2 15.2 15.2 15.2 15.2