Why does the capacitor show a positive charge, and the capacitor is positive and negative?

Since you all know about carriers, I won't explain much!

Because of the problem of external power supply, the electrons of the capacitor swim to one pole, and the atom that loses the electron is a hole, which is positively charged, and the role of electrons is lacking, so the other pole is positively charged!!

I found that your understanding of electricity is a bit wrong, you write your confusion about electricity specifically, I will help you again, or I don't know your situation, it's not good to help you!

Holes are not semiconductors, maybe your teacher just said, indeed, semiconductors include holes, but you don't get confused!

I guess you're a high school student, but if you're a college student, you'll know the relationship between holes and semiconductors!

You can think of atoms that have lost electrons as cations!

For the problems you encountered in high school about electric current, you only need to know cations and anions, and for holes, you can look at the information on the Internet, but you don't need to dig deeper!

You can think of the wire as just a pipe that transmits energy, there is no positive or negative, or you are easily confused when you are doing the problem!

The wire loses electrons because the transfer of energy is done by the directed motion of electrons, mainly because of the power supply!

If you're a college student, I suggest you ask another question and I'll explain it in another way!

Let me point out your misunderstanding:

1 Holes are not proprietary to semiconductors.

2 Electrons can't pass through the power supply Yes, but one end of the power supply can absorb electrons and the other end can release electrons, and it is an equal amount.

3 Atoms that lose electrons cannot be called ions when they do not satisfy the stable ionic electron layer structure.

4 The action of voltage causes the conductor to fill or lose electrons.

You are very serious, otherwise you will not find so many doubts, if you understand the above corrections, I believe you will be stunned.

The positive end does not have positive electrons, but the negative electrons go to the negative electrode, and the positive electrode loses electrons and shows positivity!

Capacitors have positive and negative poles.

Ordinary electrolytic capacitors: Identification method 1: The one marked with "--" on the shell of the capacitor is the negative pole, and the other pole is the positive pole.

The color of the negative electrode is generally gray-white, and the end of the positive electrode is mostly black. Identification method 2: In the newly purchased capacitors, among the unused capacitors, the two pins are long to represent the positive pole of the capacitor, and the short one is the negative pole of the capacitor.

It should be noted that the capacitance is divided into positive and negative polar capacitance, which is commonly referred to as electrolytic capacitance.

Capacitor, as the name suggests, is a container of electricity, in the circuit, mainly plays the role of voltage stabilization, isolation, filtering, decoupling, energy storage, etc., in the transformer, it is mainly voltage stabilization, and some power supplies use electrode capacitors, which play a filtering role.

Whether the capacitor is divided into positive and negative poles is divided into two cases:

1. Non-polar capacitors, that is, there is no need to distinguish between positive and negative electrodes, and they can be used casually, including multilayer capacitors, ceramic capacitors, metal film capacitors (this is a cylinder, but it is a non-polar capacitor), mica capacitors, paper oil immersion capacitors, etc.;

2. There are polar capacitors, and positive and negative electrodes must be distinguished, mainly referring to electrolytic capacitors, including aluminum electrolytic capacitors, niobium electrolytic capacitors, tantalum electrolytic capacitors, etc., these capacitors are also made into cylinders, and there are also patches, in addition, solid capacitors and supercapacitors are also part of electrolytic capacitors, so they are also polar.

Capacitance, also known as "capacitance", refers to the amount of charge stored at a given potential difference, denoted as c, and the SI unit is farad (f). Generally speaking, the charge will move under force in the electric field, and when there is a medium between the conductors, it hinders the movement of the charge and makes the charge accumulate on the conductor, resulting in the accumulation and storage of charge, and the amount of stored charge is called capacitance. Capacitance refers to the ability to hold an electric charge.

Any electrostatic field is made up of many capacitors, and where there is an electrostatic field, there is a capacitance, and the capacitance is described in terms of an electrostatic field. It is generally believed that an isolated conductor and infinity constitute a capacitance, and the grounding of the conductor is equivalent to being connected to infinity and connected with the earth as a whole.

Generally, electrolytic capacitors need to distinguish between positive and negative poles, and other capacitors do not.

There are two types. One is the electrodeless capacitance, which does not distinguish between positive and negative.

There is also a pole capacitor, which is divided into positive and negative poles, such as electrolytic capacitor, which is divided into positive and negative electrodes, and cannot be reversed. If it's reversed, it will explode.

There are two situations in which the capacitor does not have positive and negative electrodes, one has positive and negative electrodes, and the other does not.

Hermaphroditic capacitors include electrode electrolytic capacitors, polyester capacitors, porcelain capacitors, variable and trimmer capacitors, and there is no difference between positive and negative electrodes, and they can be used casually. For polarized capacitors, you need to pay attention to the positive and negative poles of the wiring, and for non-polarized capacitors, you don't need to consider this problem.

Capacitance refers to the charge storage at a given potential difference. Generally speaking, the charge moves by force in the electric field, and when there is a medium between the conductors, it hinders the movement of the charges, causing the charge to accumulate on the conductor, resulting in the accumulation of charges. The stored charge is called a capacitance.

Capacitance refers to the ability to retain an electrical charge. Any electrostatic field is made up of many capacitances, there is an electrostatic field, there is a capacitance, and capacitance is described in terms of electrostatic field. Generally speaking, the sock sail, the isolated conductor and the infinity constitute the capacitance, and the ground of the teasing conductor is equivalent to connecting to infinity, and the whole is connected to the earth.

The role of capacitance

1. Coupling: The capacitance used in the coupling circuit is called the coupling capacitor, which is widely used in resistor-capacitive coupling amplifiers and other capacitive coupling circuits to block DC and AC.

2. Filtering: The capacitive devices used in the filter circuit are called filter capacitors. This capacitor circuit is used in power supply filtering and various filter circuits to filter the capacitor and remove the signal of a certain frequency band from the total signal.

3. Decoupling: The capacitor device used in the decoupling circuit is called the decoupling capacitor. This capacitive circuit is used in the DC voltage source circuit of a multi-stage signal indicator to decouple the capacitor and eliminate harmful low-frequency cross-connections between the amplifier stages.

1. Some have positive and negative poles, and some do not.

2. Ordinary common electrolytic capacitors are noisy with pure devices, and the length of the two feet is different. The long yes + the short yes -.

3. SMD tantalum electrolytic capacitors, one side of the colored ribbon is the positive electrode.

4. Others, such as non-polarized branch free electrolytic capacitors, polyester capacitors, ceramic chip capacitors, variable and trim capacitors, have no positive and negative electrodes.