A Level Physics Notes: Experimental Physics ā The Potential Divider
Apparatus:
One digital multimeter set on 20V dc (see diagram below), lab power supply set on 10V dc, two 10kļ resistance boxes, light dependent resistor, wires.
Diagram:
Procedure:
1. Set up the circuit shown above, with both resistor
boxes,
and
set
at
2. For a range of values ofrecord
the value of
and
calculate,
Note:should
remain set at
throughout.
3. Tabulate your results and then plot a graph ofagainst
4. Calculate the gradient of your graph. Your gradient should
equal the supply voltage. This may not be
!
5. Replacewith
the light dependent resistor.
Note and explain (using your previous results) why the voltage levels change as you change the level of light incident on the LDR.