Capacitor series connection: The total capacity decreases, but the withstand voltage value increases. The withstand voltage value is the sum of the withstand voltage values of two capacitors.

Capacitor parallel connection: The total capacity increases, and the voltage withstand value is taken as the voltage withstand value of the smallest capacitor. If two capacitors are exactly the same, the voltage withstand value remains unchanged.

The main function of capacitor parallel connection is to increase the capacitance value, while the main function of series connection is to reduce the capacitance value and improve the withstand voltage value; In actual electricity consumption, capacitors are rarely used in series, while in parallel, they are mostly used for filtering.

However, filtering is generally based on a large and small capacitance value, with a difference of about 100 times in size. Parallel connection here is not to improve capacitance value, but to achieve better filtering effect. For example, parallel connection of 100uf and 0.1uf filters low-frequency interference, and 0.1uf filters high-frequency interference, which is why parallel connection is used.

used in parallel to increase the capacitance.

value, which is the voltage withstand value of the capacitor connected in parallel.

The reciprocal of the equivalent capacitance of a series capacitor is equal to the sum of the reciprocal of the capacitance of each capacitor: 1/Ctotal=1/C1+1/C2+...+1/CN. Parallel connection of capacitors can increase capacitance, while series connection can decrease it. Series capacitors are also a type of reactive power compensation equipment usually connected in series in ultra-high voltage lines of 330kV and above. Their main function is to improve the system voltage from the perspective of compensating (reducing) reactance, reduce energy loss, and enhance system stability.

The capacity increases after parallel connection, and the calculation formula is: C=C1+C2 (opposite to the resistance)

Series voltage of capacitors: The total voltage is equal to the sum of the voltages of each capacitor.

Parallel connection of capacitors: The total current is equal to the sum of the currents of each capacitor

Capacitance refers to the ability to accommodate an electric field. Any electrostatic field is composed of many capacitors, and wherever there is an electrostatic field, there is a capacitor, which is described by an electrostatic field. It is generally believed that an isolated conductor forms a capacitance at infinity, and a conductor grounded is equivalentto being connected to infinity and connected to the earth as a whole.

Capacitance (or electrical capacity) is a physical quantity that represents the ability of a capacitor to hold charges. Physically speaking, capacitors are a type of static charge storage medium that may have permanent charges, which is their characteristic. They have a wide range of applications and are indispensable electronic components in the fields of electronics and power. Mainly used in power filtering, signal filtering, signal coupling, resonance, filtering, compensation, charging and discharging, energy storage, DC isolation and other circuits.

If a capacitor has a potential difference of 1 volt between the two stages when carrying 1 bank of electricity, the capacitance of this capacitor is 1 farad, that is, C=Q/U. But the size of the capacitor is not determined by Q (charge) or U (voltage), that is, the determination formula of the capacitor is: C= ε S/4 π kd. Among them, ε It is a constant, where S is the area directly opposite the capacitor plate, d is the distance between the capacitor plates, and k is the electrostatic force constant. A common parallel plate capacitor with a capacitance of C= ε S/d（ ε Is the dielectric constant of the medium between the plates, where S is the plate area and d is the distance between the plates.