# Illustration Voltage-Current Graph of 3 Different Non-Ohmic Conductors

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Non-ohmic conductors are those conductors where the voltage $$U$$ is not proportional to the electric current $$I$$. That means: The resistance $$R = U/I$$ is NOT constant in contrast to an OHMIC conductor.

The U-I graph of a transistor (1), a diode (3) and a gas discharge (2) have been sketched as examples. An ohmic conductor, on the other hand, would result in a straight line.