Question

What is the nature of the graph obtained when potential difference is plotted against current for an Ohmic conductor?

Options

• A curved line

• A straight line through the origin

• A vertical line parallel to the voltage axis

• A horizontal line parallel to the current axis

Answer 1

For an Ohmic conductor, since V ∝ I, the graph is a straight line through the origin. For non-ohmic materials such as diodes and thermistors, the graph is curved due to their variable resistance.