The Function and Principle of Capacitors 2

3. Separate DC and AC signals: Capacitors have a blocking effect on DC signals and a conducting effect on AC signals. When a capacitor is connected to a DC power source, charge flows into the capacitor from the power source and forms an electric field between the conductor plates. Due to the poor conductivity of capacitors to DC signals, charges are stored in capacitors. When the capacitor is connected to an AC power source, the AC signal can pass through the capacitor because the frequency of the AC signal is high, and the charge will not accumulate in the capacitor, but will continue to move back and forth between the conductor plates. Therefore, capacitors can separate DC signals from AC signals.diode,

4. Filtering function: Capacitors can be used in circuits to filter out high-frequency noise. Due to the good conductivity of capacitors for AC signals, high-frequency noise can be introduced to ground through the AC signal of capacitors to achieve the purpose of filtering..diode,

2、 The principle of capacitors:

The principle of capacitors is based on the existence of an electric field. A capacitor consists of two metal conductor plates separated by an insulating material (dielectric) in between. When a power source is connected to a capacitor, charge flows from the power source into a conductor plate of the capacitor and forms an electric field in the dielectric. Due to the fact that metal conductor plates are conductors, freely movable charges will accumulate on the conductor plates, forming positive and negative charges. When the capacitor is fully charged, the amount of charge on the conductor plate reaches equilibrium, and the electric field in the capacitor reaches a stable state..diode,