How do electrolytic capacitors distinguish positive and negative poles?
Visit：6218 Date：2023-11-21
The method for judging the positive and negative electrodes of electrolytic capacitors is as follows:
[Appearance discrimination]: First, take out an electrolytic capacitor. The first method is to look at the electrolytic capacitor hose. The end of the hose is printed with the negative electrode mark. The other end of the positive electrode is not indicated. The second method is to look at the electrolytic capacitor pins. One end with a grid at the pin represents the negative pole and the other end represents the positive pole. There is also an electrolytic capacitor that is not like this, but a needle type. See the figure below: This capacitor first looks at the guide pin, and the long end of the guide pin is the positive pole. The short end of the guide pin is the negative electrode. At this time, if someone asks me, how do some of the positive and negative electrolytic capacitors that have been cut corners judge? Smart, you will find that the short end of the electrolytic capacitor hose has an electrolytic capacitor positive and negative.
[Measurement by instrument]: The positive and negative electrodes of the electrolytic capacitor can also be measured by the instrument. Find a benchtop power supply, turn the voltage down, put your electrolytic capacitor at the output of the power supply, then turn the capacitor upside down and observe the change of the ammeter. When the current is large, it is proved that the positive and negative poles of the capacitor are just The power supply is negative and negative, so it will not damage the capacitor. If there is no such power supply, you can find a low voltage. The electrolytic capacitor will heat up. Of course, the voltage selection is too low and there is no reaction. This method will damage the capacitor.
Usually electrolytic capacitors cannot be used in AC power circuits, as they can damage the capacitors.
[Electrolytic Capacitor]: The inside of the electrolytic capacitor has an electrolyte material that stores electric charge, which is divided into positive and negative polarities, similar to a battery, and cannot be reversed. The positive electrode is a metal substrate to which an oxide film is adhered, and the negative electrode is connected to an electrolyte (solid and non-solid) through a metal plate.
