1. One of the most common applications of capacitors used as filter capacitors is in electronic circuits, which removes high-frequency components from AC signals and leaves DC components in the AC signal.

2. As a DC isolation capacitor, it can also be used as a DC isolation capacitor in DC circuits to isolate AC and DC, thereby ensuring the stability of DC signals. Meanwhile, it can also protect downstream circuits.

3. Smooth capacitors for power supply can also be used as smooth capacitors for power supply, eliminating noise and variations in the power supply and ensuring the normal operation of the circuit. This usage is very common in electrical equipment such as entertainment equipment, televisions, and computers.

4. Capacitors used for oscillating circuits can generate sine waves, sound, image, and other analog circuits that require oscillating circuits. In oscillating circuits, capacitors often play an important role.

5. Used in sensors, capacitive sensors utilize the properties of capacitors to measure the capacitance change of the measured object, in order to achieve measurement of the measured object, such as temperature, humidity, water level, etc. In summary, the function and principle of capacitors are closely related to our daily lives. Capacitors play an important role in electronic devices, communication systems, power systems, and other fields, constantly developing, innovating, updating, and becoming an essential component of our daily lives.