Q:Capacitance for AC and DC effects?

This current is also a sine wave, but with the resistance is different, although there is voltage current, but does not consume energy, called reactive power.

Q:What is the use of capacitors?

As a passive component of the capacitor, its role is nothing more than the following; applied to the power circuit, to achieve bypass, decoupling, filtering and energy storage role, the following classification:

Q:What kind of capacitance can be divided into?

The paper dielectric is made of two pieces of metal foil, made of very thin capacitor paper, rolled into a cylindrical or flat cylindrical core, and then sealed in a metal shell or insulating material (such as paint, ceramics, glass glaze, etc.) production. It is characterized by a smaller size, capacity can be done bigger. But there are inherent inductors and losses are relatively large, suitable for low frequency.

Q:What is the phase-shifting capacitor, what is the difference between it and the general capacitor

The lower plate with a negative, so that the formation of potential difference between the two poles. And the positive charge does not move, only the negative charge - the electron will move, so the electrons along the plate along the wire, the power positive - negative move to the lower plate, so that the two plates will bring dissimilar charge. With the movement of electrons, the charge of the bipolar plate is more and more, the voltage is getting bigger and bigger, and the power supply potential difference is equal, it is full of electricity.

Q:Low voltage capacitor voltage 0.45 and 0.4 What is the difference between usage

0.45 and 0.4 capacitors are capacitors that rated the line voltage of 0.45kV and 0.4kV; they are suitable for 380V voltage systems, the difference lies in their pressure rating;

Q:What is the principle of capacitance isolation?

When the capacitor is connected to the DC circuit, there will be a brief charging process. When the positive and negative plates are filled with charge (when the voltage across the capacitor is equal to the supply voltage), there is no current and then flow, so the capacitor is isolated DC current

Q:What is the difference between polyester film capacitors and ceramic capacitors?

The frequency characteristics of the capacitor is better than the polyester, the capacitance and tgδ with the frequency of small changes can be used in low-voltage AC-DC circuit.

Q:Why some Y capacitor is very small, and some Y capacitor is very large?

As a capacitor of the Y capacitor, it is required to obtain the certification of the safety inspection mechanism. Y capacitor appearance is mostly orange or blue, are generally marked with safety certification mark (such as UL, CSA and other logo) and pressure AC250V or AC275V words. However, its true DC withstand voltage is above 5000V. It must be emphasized that the Y capacitor can not be used with a nominal capacitor such as the nominal voltage AC250V or DC400V.

Q:On the ground resistance, what role the capacitor

Coupling: The capacitance used in the coupling circuit is called the coupling capacitor, which is used in the capacitive coupling amplifier and other capacitive coupling circuits to make use of this capacitor circuit.

Q:How to judge the capacitor is good or bad?

Measurement, the choice of multimeter R × 10k block, with two test leads were any then the capacitor of the two pins, the resistance should be infinite. If the measured resistance (pointer to the right swing) is zero, then the capacitor leakage damage or internal breakdown.