Capacitors are one of the most widely used electronic components in electronic equipment. The main purpose of the capacitor:

1. The capacitor is used to store electricity for high-speed release. This function is used by the flash. Large lasers also use this technology to obtain very bright instant flash effects.

2. The capacitor can also eliminate pulsation. If the line that conducts DC voltage contains pulsations or spikes, the bulk capacitor can smooth the voltage by absorbing the peaks and filling the valleys.

3. The capacitor can block DC. If a smaller capacitor is connected to the battery, after the capacitor is fully charged (when the capacity of the capacitor is small, the charging process can be completed instantly), there will be no more current flowing between the two poles of the battery. However, any alternating current (AC) signal can flow through the capacitor unimpeded. The reason is that as the alternating current fluctuates, the capacitor is constantly charged and discharged, as if the alternating current is flowing.

4. A capacitor and an inductor can be used together to form an oscillator.

The main purpose of the capacitor it also includes such aspects as dc blocking, coupling, bypass, filtering, tuning loop, energy conversion, and control circuit.