1. It has charging and discharging characteristics and the ability to prevent DC current from passing and allow AC current to pass.
2. In the process of charging and discharging, the charges on the two plates have a process of accumulation, that is, the voltage has a process of establishment, so it is impossible for the voltage on the capacitor to change suddenly.
Charging of capacitor: two plates are charged with the same amount of different charges, and the absolute value of the charging amount of each plate is called the charging amount of capacitor.
Capacitor discharge: the positive and negative charges at the two poles of the capacitor are neutralized by wires. In the process of discharge, short-circuit current will be generated on the wire.
3. Capacitance reactance of capacitor is inversely proportional to frequency and capacity. In other words, when analyzing capacitive reactance, we should contact the frequency and capacity of the signal.