The first thing to note is that no current can flow directly through a capacitor
without breakdown, and the reason why the capacitor can pass alternating current is that the capacitor is constantly charged and discharged under the action of alternating current, so the current flowing out of the capacitor It is always lagging behind the voltage, but the AC charge is continuously accumulated (charged) and offset (discharged) at the two electrodes of the capacitor. After the capacitor is connected to the power supply, there must be a potential difference between the two plates. After the potential difference, there is an electric field, and then the electrons on the metal plate are concentrated in one direction under the action of the electric field force. The board connected to the positive side of the power supply is positively charged, and the other board is negatively charged. When the voltage on the positive plate begins to drop, it seems that the positive charge on the positive plate decreases, that is, the electrons increase, and the potential of the positive plate begins to drop. Then, in order to maintain the charge balance, the electrons on the negative plate will decrease. To begin to decrease, the electrons will flow out from the negative plate. At this time, there will be current generated in the negative plate. Regardless of whether it is alternating current or direct current, there is no current in the medium between the two plates of the capacitor. The reason why the capacitor can pass alternating current is that the capacitor is constantly charged and discharged under the action of alternating current. Therefore, the current flowing out of the capacitor always lags behind the voltage.
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