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Metallized Polypropylene Film Dielectric Ac Capacitors CBB65 80uf 370V For Air Conditioner

Basic characteristics of capacitors (1) capacitors can store charge and have the function of blocking dc When the two plates of the capacitor are connected to the positive and negative electrodes of the dc power supply respectively, the positive and negative charges will gather on the two plates...

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Basic characteristics of capacitors
(1) capacitors can store charge and have the function of blocking dc
When the two plates of the capacitor are connected to the positive and negative electrodes of the dc power supply respectively, the positive and negative charges will gather on the two plates of the capacitor and form a voltage between the two plates. With the continuous increase of the charge on the two electrodes of the capacitor, the voltage on the capacitor also increases gradually from small to large. When the voltage of the dc power supply is equal to, no current will flow through the circuit and the charging process stops. This is the charging effect of the capacitor. If the dc power supply is disconnected from the capacitor, the charge is stored on the capacitor, and the amount of charge stored can be calculated from the following equation, that is, when the voltage at both ends of the capacitor is constant, the larger the capacity of the capacitor, the larger the amount of charge stored. The capacitance of a capacitor is a measure of its ability to store charge.


After the charge is stored on the capacitor, the capacitor's two plates are separated by the insulating medium. Although there is voltage at both ends of the capacitor, the charge cannot pass between the electrodes, so the capacitor has the function of blocking dc.


If the two electrodes of the charged capacitor are connected by a wire, the positive and negative charges on the capacitor plate will be neutralized through the wire at the moment of connection. This is the discharge effect of the capacitor. The discharge process of the capacitor is a process of energy release, which will do work in the discharge circuit and convert electrical energy into other types of energy.


When using capacitors in electronic circuits, if the voltage on the electronic circuit is higher than the voltage on both ends of the capacitor, the capacitor is charged until the voltage established on the capacitor is equal to the voltage of the circuit. If the voltage on the electronic circuit is lower than that at both ends of the capacitor, the capacitor discharges.


(2) ac can be "passed" through the capacitor
If the capacitor to alternating current (ac) on the way, because the size of the ac voltage and the direction changing, charging capacitor will alternately, discharge, repeatedly between two plates of the capacitor is still there will be no charge, but in the ac circuit is formed the direction and size are constantly changing alternating current, like capacitor can pass the alternating current (ac), which is communication can "through" word of capacitor.


(3) capacitance reactance of the capacitor
Capacitors have special resistance characteristics to alternating current, called capacitive reactance. The capacitive reactance can be calculated from the following equation, that is, it is not difficult to see from the above equation that the larger the capacitance of the capacitor, the higher the frequency of the current, the smaller its capacitive reactance and the easier the ac current to pass through the capacitor.


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