In all pictures,RL,R1,R2,C is the same.But in fig.2 ,the Voltage value of "A" is 1.7V, in fig.1 ,the Voltage value of "A" is 1.43V. in fig.3 ,the Voltage value of "A" is 1.43V, in fig.4 ,the Voltage value of "A" is 1.43V .The Voltage value of "A" is measured by multimeter.That is why?
