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The example of non-ohmic resistance is
A) Diode
B) Copper wire
C) Filament lamp
D) Carbon resistor

Answer
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Hint:In this question, we have four devices which are used as resistances. We can identify the ohmic resistance and non-ohmic resistance on the basis of the VIgraph (straight line) and its slope(constant).

Complete step by step solution: - A non-ohmic resistance is a resistance which does not follow the Ohm’s law. Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points.
The main Characteristic of Ohmic resistance is the VI curve which is a straight line.
The diode does not have a straight line as a VIcurve.
The copper wire has a straight line as a VIgraph.
The filament lamp has a straight line as a VIgraph.
The carbon resistor has a straight line as a VIgraph.
So, the diode is a non-ohmic resistance.

Hence, option A is correct.

Additional Information: - The difference between Ohmic and non-ohmic resistances are given below-
S.No.Ohmic resistanceNon-ohmic resistance
1.These devices follow the Ohm’s law.These devices do not follow the Ohm’s law.
2.For these devices, the VIgraph is a straight line. For these devices, the VIgraph is not a straight line.
3.For these devices, the slope of theVIgraph is always constant. For these devices, the slope of theVIgraph is not constant.
4.Example- Copper wire, filament lamp, carbon resistor, etc.Example- Diode, semiconductors, inductor, etc.


Note: - In this question, we have to keep in mind that if a device follows the Ohm’s law then it is called ohmic resistance and if not then it is called non-ohmic resistance. The main characteristic of an ohmic resistance is that it has a straight line as a VIcurve and the slope of this straight line is always constant for ohmic resistance. For non-ohmic resistances, opposite characteristics are followed.
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