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Limitations of ohms law

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Limitations of ohms law

    • Posted by Ashish Yadav 6 years, 3 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Yogita Ingle 6 years, 3 months ago

    Limitations of this law:

    • Now, this law is valid for conductors only and that too at a constant temperature. The resistance of a conductor increases with temperature. Hence, for changing temperature the V-I graph for a conductor will be non-linear (not a straight line).
    • In case of insulators ohm’s law is not followed at all, insulators do not conduct at all. But, when a very high voltage is applied across an insulator dielectric break down occurs and all of a sudden current begins to flow.
    • Ohm’s law is not followed by semiconductors. The V-I graph has a steep rising at a particular voltage, which indicates that the material begins to conduct properly only after a certain voltage.

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