Your tasks

1. Draw the circuit diagram for your notes.
2. Draw a layout for your notes - do this before you dismantle your circuit.
3. Take all the necessary measurements - do this before you dismantle your circuit.
4. Plot a graph showing the current through a diode as the potential difference across it is altered.
5. Take additional measurements to fill gaps in your graph - especially where the graph is curved.
6. Calculate/estimate the resistance of the diode when it is reverse biased (not conducting well).

 

Build this circuit and measure and record the potential difference across the diode and the current through it. Repeat these measurements for the full range of movement of the potentiometer. Plot a graph of your results.

Make sure there are no gaps in your graph where extra measurements should have been taken.

 

Circuit Diagram

Possible Layout

You are expecting a graph this shape but you should not see the reverse breakdown because the voltage needed to produce this is too large and potentially unsafe.