Most of the air-dielectric capacitors are of the variable type. It consists of two sets of plates. One set of plate comprises the positive plate of the capacitor and the other set comprises the negative plate. One set is mounted on a rotating shaft. It rotates the entire set to make it mesh with the plates of the other set. When the. Paper, film and oil filled capacitors have essentially the same design. The dielectric is paper in paper capacitor. It consists of two metal foils separated. Paper Capacitors are used for coupling, buffer, bypass, and filtering. These capacitors can be used up to audio frequencies. In power. It consists of a ceramic dielectric with thin metal film as electrode which is bonded to the ceramic. They may be constructed in the form of a single digit,. These are constructed by assembling an alternate layer of mica and metal foil. In these capacitors also one set of electrically common foils serves as one plate and the other set serves as the second plate. Terminals. In, a capacitor is a device that stores by accumulating on two closely spaced surfaces that are insulated from each other. The capacitor was originally known as the condenser, a term still encountered in a few compound names, such as the. It is a with two.