Capacitance (a class of electronic components) generally refers to a capacitor.A capacitor, often referred to simply by its ability to hold an electrical charge, is denoted by the letter C.Definition 1: A capacitor, as the name suggests, is 'a container that holds electricity', a device that holds an electrical charge.Capacitors are one of the electronic components used in a large number of electronic devices, and are widely used in circuits for crossover, coupling, bypass, filtering, tuning circuits, energy conversion, control, etc.Definition 2: Capacitor, any two conductors (including wires) that are insulated from each other and are in close proximity to each other constitute a capacitor.

Supercapacitor

Supercapacitors (ultracapacitor), also known as ElectrochemicalCapacitors, ElectricalDouble-LayerCapacitors.Gold Capacitor.Faraday capacitors, developed from the 1970s and 1980s by polarization.The Farad capacitor is an electrochemical component developed in the 1970s and 1980s to store energy by polarizing an electrolyte.It is different from the traditional chemical power supply and is a kind of power supply between the traditional capacitor and the battery.It is a power source with special performance, mainly relying on double electric layer and redox pseudo-capacitance charge to store electrical energy.However, the process of energy storage does not occur in the chemical reaction, this process is reversible, and because of this supercapacitor can be repeatedly charged and discharged hundreds of thousands of times.The basic principle is the same as other types of double layer capacitors, which use the double layer structure of activated carbon porous electrodes and electrolyte to obtain a large capacity.The outstanding advantages are high power density.Short charging and discharging time.Long cycle life.It is the largest capacity among the double layer capacitors that have been put into mass production in the world.

Capacitance formula

The formula related to capacitance 1. A capacitor, if the potential difference between two stages when carrying 1 bank of charge is 1 volt, the capacitance of this capacitor is 1 law, i.e., C=Q/U. 2. But the size of capacitance is not determined by Q (charge) or U (voltage), i.e., C=εS/4πkd. where ε is a constant, S is the squared area of the capacitor pole plates, d is the distance between the capacitor pole plates, andk is the electrostatic constant.For a common parallel plate capacitor, the capacitance is C=εS/d (ε is the dielectric constant of the dielectric between the plates, S is the area of the plates, and d is the distance between the plates).3. Formula for calculating the potential energy of a capacitor: E=CU^2/2=QU/2.4. Formula for calculating the parallel connection of multiple capacitors: C=C1 C2 C3 ... Cn Formula for calculating the series connection of multiple capacitors.1/C=1/C1 1/C2 ... 1/Cn. 5. The capacitor's impedance to high frequency AC is reduced, that is, the capacitive resistance is small, and conversely the capacitor's capacitive resistance to low frequency AC is large; for the same frequency of AC electricity.The larger the capacity of the capacitor, the smaller the capacitive resistance, the smaller the capacity, the larger the capacitive resistance.

Role of capacitor

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1.Bypass circuit capacitors are energy storage devices that provide energy to the local device, which evens out the output of the regulator and reduces the load demand.Like a small rechargeable battery, the bypass capacitor is capable of being charged and discharged to the device.To minimize impedance, the bypass capacitor should be placed as close as possible to the supply power pin and ground pin of the load device.This is a good way to prevent ground potential rise and noise caused by excessive input values.Ground potential is the voltage drop at the ground connection when passing a high current burr.

Capacitance Units

The basic unit of capacitance is: F (Fa), in addition to μF (microfarads).pF (picofarads), there is also a less used unit, that is: nF (), because the capacity of capacitor F is very large, so we see generally the unit of μF.nF.pF, rather than the unit of F.The international unification stipulates that the amount of charge that a capacitor can store when 1 volt of DC voltage is applied to it is the capacitance (i.e., the amount of electricity per unit voltage) of that capacitor, denoted by the letter C.The basic unit of capacitance is the farad (F).In practical applications, the capacitor capacity is often much smaller than 1 farad, and smaller units are often used, such as millifarads (mF).Microfarads (μF).Nanofarad (nF).Skin method (pF), etc., their relationship is: 1 microfarad is equal to one millionth of a farad; 1 skin method is equal to one millionth of a microfarad, that is: 1 farad (F) = 1000 millifa (mF) 1 millifa (mF) = 1000 microfarad (μF) 1 microfarad (μF) = 1000 nanofa (nF) 1 nanofa (nF) = 1000 skin method (pF) that is: 1F = 1000000μF1μF=1000000pF