Choose the correct statement about non-ohmic resistor.

It obeys Ohm's law

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The graph for potential difference V versus current I is not a straight line.

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Slope of I-V curve is same at every point.

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Copper wire is a non-ohmic resistor.

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Solution

The correct option is B
The graph for potential difference V versus current I is not a straight line.

Non-ohmic resistors - The conductors which do not obey the Ohm's law are called the non-ohmic resistors.
Examples are : LED, solar cell, junction diode, transistor, etc.
For such resistors, a graph plotted for the potential difference V against I is not a straight line.

The conductors which obey Ohm's law is called Ohmic resistors. Copper wire is an example of an Ohmic resistor.

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Similar questions

Statement 1: The V-I curve for an ohmic resistor is non-linear.

Statment 2: Ohm's law is not a universal law, the substances which obey ohm's law are ohmic substances.

The graph of potential difference (V) versus current (I) for an ohmic resistor is a straight line as shown below:

The resistance of the resistor can be determined from this graph as:

Fig 8.13 below shows the I-V characteristic curves for four resistors. Identify the ohmic and non-ohmic resistors. Give a reason for your answer.

r

R

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