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 \[VI\]graph (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 \[VI\]curve.
The copper wire has a straight line as a \[VI\]graph.
The filament lamp has a straight line as a \[VI\]graph.
The carbon resistor has a straight line as a \[VI\]graph.
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-
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 \[VI\]curve and the slope of this straight line is always constant for ohmic resistance. For non-ohmic resistances, opposite characteristics are followed.
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 \[VI\]curve.
The copper wire has a straight line as a \[VI\]graph.
The filament lamp has a straight line as a \[VI\]graph.
The carbon resistor has a straight line as a \[VI\]graph.
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 resistance | Non-ohmic resistance |
1. | These devices follow the Ohm’s law. | These devices do not follow the Ohm’s law. |
2. | For these devices, the \[VI\]graph is a straight line. | For these devices, the \[VI\]graph is not a straight line. |
3. | For these devices, the slope of the\[VI\]graph is always constant. | For these devices, the slope of the\[VI\]graph 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 \[VI\]curve 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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