Question

State and explain the limitations of Ohan's
law,​

Answer 1

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Ohm's law has very limited validity and hence is not a general law. It is more of an empirical rule which summarizes in a simple andnconvenient manner observations about certainn materials under certain conditions.

Limitations of Ohm's law :

(1) Most materials do not obey this simple linear law, i.e., their 1-V graph is not a straight line. They are called non-ohmic conductors

Those materials that obey the law are called ohmic conductors. Metals are the most accurately ohmic conductors.

(2) Metals obey Ohm's law only if their physicalnconditions, such as temperature, remain constant. Their resistance changes with temperature. Hence, their 1-V graph deviates from a straight line if the temperature increases due to either prolonged passage of current or passage of a large current.

Answer 2

Answer:

This law cannot be applied to unilateral networks. ... A unilateral network has unilateral elements like diode, transistors, etc., which do not have same voltage current relation for both directions of current. Ohm's law is also not applicable for non – linear elements.

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