Non-Ohmic Device - V Vs. I
To demonstrate the non-linearity of the V vs. I curve for a diode.
Ohm's law apparatus with zener diode.
A zener diode is connected in series with a resistor across the output of a power supply. Observe the current vs. voltage as the voltage is varied. The voltage and current are read from projection meters when the device is placed on an overhead projector.