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Is ohms law true for all materials?

Updated: 8/20/2019
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10y ago

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Most definitely NOT!

For Ohm's Law to apply, the ratio of voltage to current MUST be constant for variations in voltage. And this is only true for a small number of materials we call 'ohmic' or 'linear' materials -meaning that if we plotted a graph of voltage against current for changes in voltage, we'd end up with a straight line (linear) graph. But most materials are 'non-ohmic' or 'non-linear' -in other words, the resulting graph is NOT a straight line.

It can be argued that Ohm's Law, therefore, is not a 'law' at all! Perhaps it's time it was scrapped?

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