The method to determine the positive and negative poles of an electrolytic capacitor is as follows:

Appearance identification: First take out an electrolytic capacitor. The first method is to look at the electrolytic capacitor hose. One end of the hose has a negative pole printed on it. mark. The positive terminal on the other end is not indicated. The second method is to look at the electrolytic capacitor pins. One end of the pin with a grid represents the negative terminal, and the other end represents the positive terminal. There is also a kind of electrolytic capacitor that is not like this, but is a guide pin type. See the picture below: For this kind of capacitor, first look at the guide pin. The long end of the guide pin is the positive electrode. The short end of the guide pin is the negative pole. If someone asks me at this time, how to judge the positive and negative poles of some electrolytic capacitors that have been cut off? If you are smart, you will find that there will be an electrolytic capacitor positive and negative pole mark on the short end of the guide pin of the electrolytic capacitor rubber tube.

Measurement through instruments: The positive and negative electrodes of electrolytic capacitors can also be measured through instruments. Find a desktop power supply, turn down the voltage, connect your electrolytic capacitor to the output end of the power supply, then turn the capacitor upside down and connect it, and observe the changes in the ammeter. When the current is large, it proves that the positive and negative poles of the capacitor are exactly in line with each other. The positive and negative of the power supply are reversed, so the capacitor will not be damaged. If there is no such power supply, you can find a low voltage. If the electrolytic capacitor is connected reversely, it will generate heat. Of course, if the voltage is too low and there will be no response, this method will damage the capacitor.

Generally, electrolytic capacitors cannot be used in AC power circuits, otherwise the capacitor will be damaged.

Electrolytic capacitor: There is an electrolyte material inside the electrolytic capacitor that stores charge. It has positive and negative polarities. It is similar to a battery and cannot be connected reversely. The positive electrode is a metal substrate with an oxide film, and the negative electrode is connected to the electrolyte (solid and non-solid) through the metal plate.

Nonpolar (bipolar) electrolytic capacitors adopt a double oxide film structure, which is similar to two polar electrolytic capacitors with two negative electrodes connected. The two electrodes are two metal plates. (both have oxide films) are connected, and the middle of the two sets of oxide films is the electrolyte. Polarized electrolytic capacitors usually play the roles of power supply filtering, decoupling (ǒu), signal coupling and time constant setting, and DC isolation in power circuits or intermediate and low frequency circuits. Non-polar electrolytic capacitors are usually used in audio frequency divider circuits, TV S correction circuits and single-phase motor starting circuits.

Introduction: There is an electrolyte material inside the electrolytic capacitor that stores charge. It is divided into positive and negative polarities. It is similar to a battery and cannot be connected reversely. The positive electrode is a metal substrate with an oxide film, and the negative electrode is connected to the electrolyte (solid and non-solid) through the metal plate. ?

Electrolytic capacitor paper, also known as capacitor diaphragm paper, plays an isolation and insulation role between the anode and cathode aluminum foil of the electrolytic capacitor. The better the quality of electrolytic capacitor paper, the better it can meet the requirements of capacitor withstand voltage, low impedance and small loss. ?

Nonpolar (bipolar) electrolytic capacitors adopt a double oxide film structure, which is similar to two polar electrolytic capacitors with two negative electrodes connected. The two electrodes are two metal electrodes. The plates (both with oxide films) are connected, and the electrolyte is in the middle of the two sets of oxide films.

Function: Electrolytic capacitors are generally used for filtering and rectification in DC circuits. Polarized electrolytic capacitors usually play the role of power filtering, decoupling, signal coupling, time constant setting, and DC lamp isolation in power circuits or intermediate and low frequency circuits. Non-polar electrolytic capacitors are usually used in audio crossover circuits, TV S correction circuits and single-phase engine starting circuits.