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Most conductors and electronic devices are 'exceptions' to Ohm's Law. Ohm's Law only applies when the ratio of voltage to current remains constant for variations in voltage. Materials which behave in this way are termed 'linear' or 'ohmic'. But mostmaterials do not behave in this way, and are termed 'non-linear' or 'non-ohmic'.

In simple terms, if you plot a graph of voltage against current, and the result is a curve, then that material does not obey Ohm's Law.

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Q: What is an exception to ohm's law?
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