The light -emitting diode, referred to as LED for short, is a commonly used light emitting device. It releases energy emitting energy through electron and holes. It is widely used in the field of lighting. The emitting diode can efficiently convert electrical energy into optical energy, and has extensive use in modern society, such as lighting, tablet display, medical devices, etc. Do you know how to distinguish the positive and negative poles of LED glow diodes? Let's tell you below.

1. For ordinary diode, you can observe the surface of the tube. Generally, there is a section of the white line as a negative electrode.

2. For the light emitting diode, the positive poles are generally long, and the short pins are short.

3. If the pin is cut as long, the inside of the tube can be observed. Generally, the metal is extremely small, and the negative pole is negative.

4. If your eyes are unclear, you can also open a multimeter and connect the red and black tables to two pins.

The above is the positive and negative pole of the LED light -emitting diodes. I hope it will be helpful to everyone.