Question

Limitations of ohm law

Answer 1

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The limitations of Ohm's law are outlined below: 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.

Answer 2

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According to Ohm's law,

Current flowing in a conductor is directly proportional to the potential difference applied across to its ends at constant temperature & physical conditions.

So, According to the definition

V ∝ I

V/I = constant

Put the constant as “r” which indicates the resistance of the conductor.

R = V/I

V = IR

Where

I = current flowing in the conductor

V = potential difference applied across the conductor

R = resistance of the conductor

Unit of Resistance is called omega (Ω)