Non-ohmic Devices

In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode i...

Any device that does not exhibit a linear relationship between voltage and current is known as a non-ohmic device. For example, a diode is a semiconducting element that does not obey Ohm's law and allows current to flow in one direction.

A plot of current versus voltage can be used to study the behavior of a diode. The diode conducts when...