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Give any two practical limitations of Oh...

Give any two practical limitations of Ohm's law.

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Ohm .s law fails,if the current varies non -linearly with voltage (Potential differences)
Oh,.s law fails ,if the relation between voltage and current is not unique (I GaAs)
Ohm.s law is not applicable at very low temprerature and very high temperature.
Ohm.s law fails ,if the relation between voltage (V) and current (I) depends on the sign of voltage.OR Ohm.s law is not applicable to non -ohmic derives (In diode/triode etc.)
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