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CBSE - XII Science - Physics - Current Electricity

what are the limitations of ohms law ?

Asked by 24th September 2009, 10:54 PM
Answered by Expert


Limitations of Ohm's law,

1/ V = IR where R, resistance is constant, but that's not true always. It depends upon tempreature. Tempreature increase results in  increased the resistance.

2/ It can't be applied to all the materials. For example semiconductors, gases such as air.

3/ It can't be applied to electrical components that show negative resistance such as high vacuum electron tubes and tunnel diodes.




Answered by Expert 25th September 2009, 10:00 PM

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