Capacitor

Capacitor

A capacitor is a passive component that stores electric charge and is used as a filter in electronic circuits. It passes AC signals and blocks DC signals. It is made of two conductor plates with a dielectric material between them. The two plates have equal but opposite charges, with one plate having a positive charge and the other having a negative charge. The capacitance of a capacitor is measured in farads.

Like resistors, capacitors are also classified into two main categories:

(1) Fixed Capacitors
(2) Variable Capacitors

(1) Fixed Capacitors

The value of a fixed capacitor is fixed by the manufacturer and cannot be changed. Some examples of fixed capacitors are:

Paper capacitors
Ceramic capacitors
Mica capacitors
Polyester capacitors
Electrolytic capacitors

(2) Variable Capacitors

The value of a variable capacitor can be changed.

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