TITLE:
Use of potential divider for converting sensor resistance value to
e.m.f. output.
OBJECTIVE:
To use the potential divider circuit for the conversion of sensor
resistance value to e.m.f. output
EQUIPMENT:
d.c. power supply, resistor, resistance sensors
ELECTRIC CIRCUIT:

Light dependent resistor (LDR)
Resistance changes with light level.
Used for street lighting control and measurement of light level.
Use potential divider circuit to convert light level to voltage level.
R
Vin
Vout
LDR
Vout 



RLDR
xVin
R  RLDR
Use the ohmmeter to determine the resistance range of the LDR
Select a value for R in the range of the lowest value measured on the LSR
Set up the circuit shown selecting Vin as 10 Volts and vary the light level falling on
the sensor by adjusting the height of a book above the sensor and plot a graph of
height against voltage output.
Design Project:
Use a potential divider circuit to supply between 3.5 V and 4 V to a separate circuit.
Select all the components and component values and model your design in LT Spice to
demonstrate that it works.