Types of Capacitors Of Electronic components

 Types of Capacitors Of Electronic components

• Based on the type of materials used in the capacitor plates, the following types are the most common types of capacitors: Ceramic Capacitors, Film Power Capacitors, Super Capacitors and Variable Capacitors. 

1. Ceramic Capacitors: Ceramic capacitors are made up of ceramic and metal where metal acts as the electrode and ceramic is the dielectric. This type of capacitor is used in applications of high frequency and high current pulse loads. 
2. Film Power Capacitors: In film power capacitors, the dielectric films are drawn to a thin layer surrounded by metallic electrodes on a cylindrical wiring. Polypropylene is used as the dielectric. 
3. Super Capacitors: Super capacitors are electrochemical capacitors with no specific dielectric in it. The storage of charge is obtained by either separation of charge or redox reactions. 
4. Variable Capacitors: All the above mentioned capacitors are fixed capacitors which cannot vary their capacitance. A variable capacitor can vary its capacitance by mechanical motion. 

The 2 methods used to vary capacitance are tuning and trimming

Applications of capacitor:-

• Capacitors are used in designing filters. They are used to reduce the impact of electric noise in digital circuits. Also to separate the AC components of a signal from DC components. Large capacitors are used to store energy. 
• Safety with capacitors: Capacitors retain charge for a long time even after the power is removed. So before touching the circuit, ensure that the capacitor is fully discharged.