Does The LED Power Supply Have Positive And Negative Poles?

Yes
The LED power supply does have positive and negative poles. The following is a detailed description of the positive and negative poles of the LED power supply: ‌
‌The existence of positive and negative poles‌
As a device that provides power to electronic devices, the internal structure of the LED power supply determines that it needs to distinguish between positive and negative poles. Whether it is a lithium battery, a dry cell or a rectifier power supply, it is necessary to distinguish between positive and negative poles.

‌How to distinguish between positive and negative poles‌
‌Appearance observation‌: The pin lengths of some LED power supplies are different. The longer pin is usually the positive pole and the shorter pin is the negative pole.
‌Marking symbol‌: Some LED power supply packages will be marked with "+" and "-" symbols, indicating the positive and negative poles respectively.
‌Multimeter test‌: Using the diode test mode of the multimeter, the positive and negative poles can be accurately determined. The end of the pin connected to the red test pen that shows a lower resistance value is the positive pole, and the pin connected to the black test pen is the negative pole.
‌Battery test‌: By connecting the positive and negative poles of the battery and observing whether the LED light is on, the positive and negative poles can also be determined.
‌Impact of reverse connection of positive and negative poles‌
If the positive and negative poles of the LED power supply are reversed, it may cause the device to malfunction or even damage the LED lamp or other electronic components. Therefore, when installing or using the LED power supply, you must ensure that the positive and negative poles are connected correctly.

‌Installation precautions‌

When installing the LED power supply, be sure to disconnect the power supply to avoid the risk of electric shock.
For novices, it is recommended to operate under the guidance of professionals to ensure that the wiring is firm and insulation measures are taken.