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In a DC circuit, the capacitor is equivalent to a circuit breaker. A capacitor is a component that can store charge and is one of the most commonly used electronic components.
This has to be said from the structure of the capacitor. The simplest capacitor is made up of both ends of the plate and the intermediate insulating dielectric (including air). After power, the plate is charged, forming voltage (potential difference), but because of the middle of insulating material, so the whole capacitor is non-conductive. However, this situation is in the absence of a capacitor's critical voltage (breakdown voltage) under the conditions. We know that any matter is relatively insulated, when the material at both ends of the voltage increase to a certain extent, the matter can be conductive, we call this voltage is called breakdown voltage. Capacitance is no exception, after the capacitor is penetrated, it is not an insulator. However, in the middle school, such voltage in the circuit is not visible, so are under the breakdown voltage work, can be seen as insulation.
However, in the AC circuit, the direction of the current is changed by a certain function relationship over time. The capacitor charge and discharge process is time, this time, in the plate between the formation of a change in the electric field, and this electric field is also the function of the time. In fact, the current is passed through the capacitor in the form of an electric field.