Is the conductive direction of the diode the current direction

Is the conductive direction of the diode the current direction

The current direction in a diode with forward bias (conduction) flows from the positive electrode with an arrow to the negative electrode with a vertical direction, while the reverse bias (leakage current) is the opposite.

Conductive characteristics of diode:

The important characteristic of a diode is its unidirectional conductivity. In a circuit, current can only flow in from the positive pole of the diode and out from the negative pole. The following is a simple experiment to illustrate the forward and reverse characteristics of diodes.

1. Positive characteristics.

In electronic circuits, when the positive pole of the diode is connected to the high potential end and the negative pole is connected to the low potential end, the diode will conduct. This connection method is called forward bias. It must be noted that when the forward voltage applied to both ends of the diode is small, the diode still cannot conduct, and the forward current flowing through the diode is very weak. Only when the forward voltage reaches a certain value (referred to as the "threshold voltage", which is about 0.2V for germanium diodes and 0.6V for silicon diodes), can the diode conduct directly. After conduction, the voltage at both ends of the diode remains basically unchanged (about 0.3V for germanium diodes and 0.7V for silicon diodes), known as the "forward voltage drop" of the diode.

2. Reverse characteristics.

In electronic circuits, the positive pole of a diode is connected to the low potential end and the negative pole is connected to the high potential end. At this time, there is almost no current flowing through the diode, and the diode is in the cut-off state. This connection method is called reverse bias. When the diode is in reverse bias, there will still be a weak reverse current flowing through the diode, known as leakage current. When the reverse voltage at both ends of the diode increases to a certain value, the reverse current will sharply increase, and the diode will lose its unidirectional conductivity. This state is called diode breakdown.