Chapter 22, Problem 106A

To determine

To explain: the reason why the given graph is more useful than a similar graph for a resistor that obeys Ohm’s law.

Explanation of Solution

Introduction:

The voltage through the resistance is directly proportional to the applied potential difference. The equation for the acceleration between current, voltage and resistance is

  $V=IR$…… (1)

Here, $I$ is the current, $V$ is the voltage and $R$ is the resistance of the bulb.

Electric components that obey the above relation are called as a Ohmic materials. Electric components that don’t object ohms law are called as non ohmic materials.

The given figure is attached below:

  

The above graph is voltage-current graph and the slop represents the resistance of the diode. The graph is not a linear graph and the slope varies from one point to another, thus it’s a non-ohmic material.

The following graph is the voltage-current graph and in this case slope is constant. The linear graph has constant slope. The material which is ohmic in nature would produce linear graph like shown below: