What is the essence of capacitance and what is capacitance?

A capacitor is a device that stores an electric charge that accumulates on the capacitor to generate a voltage between the two plates. Capacitance describes not how much charge a capacitor can store, but how much charge it can store, "capacity" refers to how much charge can accumulate per 1 volt of voltage, 1f = 1 coulomb volt, just like the ability of a power supply to do work is not how much joule work is done, but how much joule work can be done per second. If 1V can store 100C of electricity, it must be higher than the capacitor that stores 10C of 1V voltage.

1f = 144j, haven't heard of it.

First of all, understand the role of electric current, the bulb can emit light because there is an electric current flowing through the filament, and the motor can turn because there is an electric current in the winding.

There are many ways to generate current, but the main ways to generate current in practical applications are voltage to generate current, and capacitor to generate current.

The key essence of capacitance is charging and discharging, with charging and discharging in the circuit will form a current, with this controllable current can you use the current to do what you want to do, so we must fully understand the principle of capacitor charging and discharging (again, charging and discharging is to generate current), as for how much power the capacitor can be charged is secondary, for different capacitors, different circuits specific analysis.

From C=Q U, it can be seen that 1F=1C 1V, which means that when the voltage is 1 volt, the capacitor stores the charge of 1 library, and the capacitor is 1 farad, similar to the cross-sectional area of the water container, the water depth is the same, the larger the area, the more water is held, and the same reason, the same voltage, the more charged is stored, the greater the capacitance. 1f = 144J, it should be wrong, j is the unit of work, energy, and heat, and f is the unit of capacitance.

The essence of capacitor paralleling is finally understood!

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

Capacitance (or capacitance) is a physical quantity that expresses a capacitor's ability to hold an electric charge. Capacitance from the physical point of view, it is a static charge storage medium, may be permanent charge, this is its characteristic, it is widely used, it is an indispensable electronic component in the field of electronics and electricity. It is mainly used in power supply filtering, signal filtering, signal coupling, resonance, filtering, compensation, charge and discharge, energy storage, DC isolation and other circuits.

Formula for capacitance (defined):

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 magnitude of the capacitance is not determined by q (charged) or you (voltage), i.e. the capacitance is determined by the following formula: c = rs 4 kd. 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.

Common parallel plate capacitors, the capacitance is c = s d ( is the dielectric constant of the medium between the plates, r 0, 0 = 1 4 k, s is the plate area, d is the distance between the plates).

1) The formula for calculating the potential energy of a capacitor is: e=c*(u 2) 2=qu 2=(q 2) 2c.

2) The formula for calculating the parallel connection of multiple capacitors: c=c1+c2+c3+....＋cn。

3) The formula for calculating the series connection of multiple capacitors: 1 c = 1 c1 + 1 c2 + ....＋1/cn。

4) Three capacitors in series: c=(c1*c2*c3) (c1*c2+c2*c3+c1*c3).

The above content reference: Encyclopedia - Capacitors.

Capacitance refers to the ability to hold an electric charge. Any electrostatic field is composed of many capacitances, there is an electrostatic field there is capacitance, capacitance is described by 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 to the earth as a whole.

The function of capacitors in electronic circuits

The capacitance used in the coupling circuit is called the coupling capacitor, and it is used in a large number of resistor-capacitance coupling amplifiers and other capacitive coupling circuits to play the role of blocking the DC flow and AC.

The capacitors used in filter circuits are called filter capacitors, which are used in power supply filtering and various filter circuits, and the filter capacitors remove the signal in a certain frequency band from the total signal.

The capacitors used in decoupling circuits are called decoupling capacitors, which are used in the DC voltage supply circuits of multistage amplifiers to eliminate harmful low-frequency cross-links between each stage of the amplifier.

Capacitance is an abbreviation for "capacitance", which is used to characterize the ability of electronic components to store electricity at a given potential difference, and is often denoted by the letter C. Capacitors are sometimes referred to as "capacitors".

The charge moves under the action of an electric field; When a conductor is filled with a medium, the medium prevents the charge from moving and causes the charge to accumulate and store on the conductor, and this stored amount of charge is called a "capacitance", and the electronic components that store the charge accordingly are called "capacitors". Capacitors have been widely used in the fields of electronics and electric power, and are widely used in electronic circuits such as filtering, signal processing, resonance and energy storage, and charge and discharge.

The function of capacitors in electronic circuits

1. Coupling: The capacitance used in the coupling circuit is called the coupling capacitor, and the capacitance circuit is widely used in the resistor-capacitance coupling amplifier and other capacitive coupling circuits to play the role of blocking the DC flow and AC.

2. Filtering: The capacitor used in the filter circuit is called the filter capacitor, which is used in the power supply filter and various filter circuits, and the filter capacitor removes the signal in a certain frequency band from the total signal.

3. Decoupling: The capacitor used in the decoupling circuit is called the decoupling capacitor, which is used in the DC voltage supply circuit of the multi-stage amplifier, and the decoupling capacitor eliminates the harmful low-frequency cross-connection between each stage of the amplifier.

Capacitors are often referred to simply as capacitors, which are denoted by the letter C.

1. Capacitor, as the name suggests, is a "container for electricity", trapped, capacitor is one of the electronic components widely used in electronic equipment, widely used in circuits in the right through current, coupling, bypass, filtering, tuning loop, energy conversion, control, etc.;

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

3. The main physical feature of the capacitor is the storage of electric charge, because the storage of electric charge means the storage of energy, so it can also be said that the capacitor is an energy storage element, to be precise, it is the storage of electric energy, and two parallel metal plates constitute a capacitor;

4. Types of capacitors: including fixed Luzi capacitors, variable capacitors, electrolytic capacitors, porcelain capacitors, mica capacitors, polyester capacitors, tantalum capacitors, etc., among which tantalum capacitors are particularly stable, and capacitors are divided into fixed capacitors and variable capacitors, fixed capacitors are often used as coupling, filtering, integration, and differentiation in circuits, and together with resistors to form RC charge-discharge circuits, and inductors together to form LC oscillation circuits.

Capacitors are often referred to simply as capacitors, which are denoted by the letter C.

1. Capacitor, as the name suggests, is a "container for electricity", is a device that accommodates electric charge, the English name is capacitor, capacitor is one of the electronic components widely used in electronic equipment, widely used in circuits in the right through AC, coupling, bypass, filtering, tuning loop, energy conversion, control, etc.;

2. Any two conductive grips that are insulated from each other and are very close to each other constitute a capacitor;

3. The main physical feature of the capacitor is the storage of electric charge, because the storage of electric charge means the storage of energy, so it can also be said that the capacitor is an energy storage element, to be precise, it is the storage of electric energy, and two parallel metal plates constitute a capacitor;

4. Types of capacitors: including fixed capacitors, variable capacitors, electrolytic capacitors, porcelain capacitors, mica capacitors, polyester capacitors, tantalum capacitors, etc., the tantalum capacitors are particularly stable, and the capacitors are divided into fixed capacitors and variable capacitors, and the fixed capacitors are often used as coupling, filtering, integration, and differentiation in the circuit, and the resistor together to form the RC charge and discharge circuit, and the inductor together to form the LC oscillation circuit. Sleepy and noisy.