Q. 264.6( 43 Votes )

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According to Ohm’s law, the potential difference across a conductor is directly proportional to the current flowing through it

where V is the potential difference and I is the current.

The relationship between V and I is linear for a conductor.

To remove the proportionality, we replace it by a constant called R

Here R is the resistance of the conductor and is a fixed value.

If the student plots the potential difference on the x-axis, then the slope of the graph will be

The quantity on y axis is current(I) and on x axis is voltage(V), the slope will be

The resistance will be the reciprocal of the slope.

This straight line signifies that the resistor is a linear element, i.e. it has linear characteristics in a V-I graph.

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