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Georg Ohm first discovered his law empirically. Later he generalized it significantly and formalized it better. It seems that it got a rather cold welcome, which caused his withdrawal from the Academic world for six years. This wrong was later corrected, when he got the Copley medal. More about this is in the link about Georg Ohm. The well known law of the mathematical equation that describes the relationship
V = I * R
was later called "Ohm's law" to remember Georg Ohm. Ohm's own idea was more another equation:
Resistance R = rho * length / area.
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