What is the use of sonsors in potential divider circuits?
The voltage across the output of a potential divider Vo=Vs*Rs/Rtot where Vs=supply voltage across divider, Rtot=total resistance and Rs=sensor resistance which varies with light intensity, temperature or strain. The output voltage Vo can the be connected to one input of a differential op-amp with a large gain to amplify small differences in its input voltages for sensitive and accurate measurement (with calibration) or even to act in comparator mode to switch on/off a device at a given voltage level. You could also connect it using suitable buffering to the input port of a computer to graph/display the signal as a function of time for example.
