What type of relationship does a diode exhibit in its current-voltage characteristics?

A diode exhibits a non-linear relationship in its current-voltage characteristics. This relationship is governed by the diode equation.

Here are the steps to understand this relationship:

1. Forward Bias: When a diode is in forward bias (positive voltage), the current through the diode increases exponentially for a small increase in voltage. This is due to the reduction in the barrier potential by the applied voltage.

2. Reverse Bias: When a diode is in reverse bias (negative voltage), a small reverse saturation current flows through the diode. This current remains almost constant until the applied voltage reaches the breakdown voltage.

3. Breakdown Region: When the applied reverse bias voltage is more than the breakdown voltage, a sudden increase in current occurs. This is due to the rapid increase in the number of free electrons and holes.

4. Zero Bias: When no external voltage is applied, no current flows through the diode.

So, the relationship between current and voltage in a diode is non-linear and is divided into three regions: forward bias, reverse bias, and breakdown region.