Why do capacitors work, and what are capacitors used for?

Instead of a closed circuit, a capacitor is two disconnected conductors that can store an electric charge so that there is a potential difference between them, and when they are connected, they can be discharged.

No, it's two metal plates that are close together, and they can store an electric charge so that there is a potential difference between them, and when they are connected, they can be discharged.

It is a component that stores electric charge, to create a potential difference of the element, the structure is two metal plates close to each other, they do not discharge, that is to say, the charged on the respective metal plates do not go to the opposite side, the principle of their conduction is that when the voltage is added to both ends, the two plates will have voltage, will attract each other to the charge on the opposite plate, but because it cannot be neutralized with the opposite charge, it will cause the charge to accumulate more and more on the two plates, but if it is the same alternating current, the charge on the two plates will continue to go back and turn back, and the frequency is the same as the current cycle Because when the voltage at one end drops, the voltage at the other end also drops back to negative, that is, the current goes back to the back, so it is a circuit element that conducts AC resistance DC and is a bit opposite to the inductor.

There's a nice explanation inside.

In DC circuits, capacitors are equivalent to open circuits.

The function of the capacitor is that in the DC circuit, the capacitor is equivalent to an open circuit. Capacitor is a component that can store electric charge, and it is also one of the most commonly used electronic components.

Uses of Capacitors:

1. For energy storage purposes, the battery function is used, and when the load current becomes larger due to the instantaneous power supply interruption or the rapid rise of the IC driving speed, the line voltage of the electric support rush source decreases, which may lead to IC failure. In order to prevent the malfunction of the laughing high, the charge stored by the capacitor when the power line is normal is provided to the IC side is temporarily maintained.

2. The decoupling application uses the characteristics of alternating current to provide a stable DC voltage and remove the external inductive noise overlapping the power line and the high-frequency noise caused by high-speed circuit drive. It is used in general power supply circuits.

3. Coupling use, remove the DC bias voltage of the front circuit, and only transmit the AC signal voltage to the back circuit, which is generally used for audio circuits. <>

Capacitance is the storage of free charge at a given potential difference, denoted as c, and the SI unit is farad (f).

Generally speaking, the charge will be moved by 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 the charge, and the amount of stored charge is called capacitance.

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.

The role of capacitors:

A bypass capacitor is an energy storage device that provides energy to the local device, which can uniformize the output of the regulator and reduce the load demand. Like a small rechargeable battery, a bypass capacitor can be charged and discharged into the device.

To minimize impedance, the bypass capacitor should be as close as possible to the power supply and ground pins of the dead load device. This is a good way to prevent ground potential elevation and noise caused by too large input values. The ground potential is the voltage drop at the ground junction when it passes through a high-current burr.

Summary. A capacitor is made up of two metal plates, separated by an insulating material called a dielectric.

A capacitor is made up of two metal plates, separated by an insulating material called a dielectric.

Pro, capacitor is one of the electronic components widely used in Tongshan electronic equipment, which is widely used in the circuit of the straight through AC, coupling, bypass, filtering, modulation and answering of the harmonic loop, energy conversion, control and other aspects of the local surface;

Any two conductors that are insulated from each other and are very close to each other constitute a capacitor;

Pro, the main physical feature of the capacitor is the storage of electric charge, because the storage of electric verry means the storage of energy, so it can also be said that the capacitor is an energy storage element, pro, the exact type of search is to store electric energy, two leaky parallel metal plates constitute a capacitor;

Capacitance is the ability to store an electric charge and is often described in terms of electrostatic field.

Capacitance, also known as "capacitance", refers to the storage of free charge at a given potential difference, denoted as c, and the SI unit is farad (f). Generally speaking, the charge will be forced to move 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 the charge, and the stored charge is called capacitance.

Capacitance refers to the ability to hold an electric charge. Any electrostatic field is composed of many capacitors, and if there is an electrostatic field, there is capacitance, and capacitance is described by electrostatic field. It is generally believed that

An isolated conductor forms a capacitance with infinity, and the conductor is grounded to the infinity and connected to the earth as a whole.

Units and Conversions

In the International System of Units, the unit of capacitance is farad, referred to as method, and the symbol is f, because the unit of farad is too large, so the commonly used capacitance unit drafts are changed to millimethod (mf), micromethod (f), nano method (nf) and picomethod (pf) and so on.

The conversion relationship is: 1 farad (f) = 10 3 millifarth (mf) = 10 6 microfarth (f) = 10 9 nanofarth (nf) = 10 12 picofara (pf) = 10 15ff. Relationship between capacitance and battery capacity:

1 volt-ampere-hour = 1 watt-hour = 3600 joules, w = .

For a capacitor, if the potential difference between the two stages is 1 volt with 1 bank, the capacitance of this capacitor is 1 farad, i.e., c=q u. However, the size of the capacitance is not determined by q (charged) or you (voltage), i.e., the determination of the capacitance is:

c=εrs/4πkd。where r is the relative permittivity, s is the area opposite the capacitive plate, d is the distance of the capacitive plate, and k is the electrostatic constant.

The above content reference: Encyclopedia - Capacitors.