If the capacitance is C between two successive plates , then the capacitance of the multiple capacitor is nC , where 'n' is the number of dielectric plates used . The whole arrangement is sealed in a plastic case . These capacitors are used in high frequency oscillating circuits . The dielectric constant of mica does not change much temperature and hence , these capacitors are used as standard capacitors in the laboratory .

As the name itself indicates, the capacitance of a variable capacitor can be varied gradually . This is achieved by adjusting the effective area included between the plates . The plates are usually made of brass or aluminium and semi circular in shape . Variable capacitors are widely used in circuits in radio and T.V receivers .

Like solid salts, ionic liquids possess negligible vapor pressure. Even though it is an organic solvent, it does not vaporize until and unless it is heated to the point of thermal decomposition. Therefore, they do not pose pressure and explosion risks. Ionic liquids do not contain combustion, which is why they are not prone to fire hazards either. Another reason why ionic liquids are used in lithium ion batteries is due to their capability of operating at high temperature limits. They provide a much broader potential range of operating temperatures as compared to current electrolytes due to their characteristic of high temperature stability.

Multiple Capacitor is a combination of several parallel plate capacitors connected in parallel and is of fixed capacitance . Mica is used as the dielectric between a number of tin foils arranged in parallel as shown in figure (2).

Super capacitors, also known as electrochemical capacitors (ECs) are power leveling storage devices. Reduction and oxidation of electro active polymers, carbonaceous products or metal oxides are utilized for the purpose of storing energy. An increase in the capacitor voltage causes a significant enhancement of power and energy. Ionic liquids are used in super capacitors as a replacement to aqueous electrolytic solution to enhance the capacitor voltage with lower capacitance values. Due to higher decomposition potential, ionic liquids are able to enhance the capacitor voltage.

Ionic liquids are thermally stable salts and possess strong properties at room temperature, which is why they are preferred as electrolytes for super capacitors. With unique physicochemical properties such as, high thermal stability, electrochemical stability and negligible vapor pressure, ionic liquids are suitable for electrochemical capacitors. On the other hand, due to their characteristic of high viscosity, the process of wetting of highly porous carbon is complicated. However, this issue is easily resolved by operating the capacitor at a higher temperature.

I got frustrated as to where is the cause of power problem. Everytime when i switch on the power supply the fuse blowimmediately the fuse became dark color and this indicatethat there is a major short circuit in the power supply. I have checked all the components in the power supply and can't find the culprit!What i do is i desoldered all the suspected parts one by one and replaced with a known good component. I eventually found the caused of the power supplyproblem.

Capacitors are simply energy-storing devices. These are similar to a battery. A battery releases its energy slowly due to the reaction of its components which then produce electrons. A battery can thus last from a few months to even a year. A capacitor needs to release a large amount of energy in a short span of time, usually seconds. A capacitor basically consists of two metal plates separated by a non-conducting medium. The power of the capacitor depends on the function it has to carry out. Due to its capability of delivering a large amount energy for a fraction of a second, it is used in many sectors for different purposes. For instance, television sets, radio and other kinds of electronic equipment. Tuning a radio to a station, taking a flash photo with any camera or changing the channels on the TV set all of these involve the use of different kinds of capacitors.

Every capacitor will have a specification related to the maximum voltage it can tolerate. This value is the last limit till which a capacitor can tolerate the voltage, a voltage beyond the specified range will definitely cause damage to the appliance. Hence, capacitors with a broader range of voltage are selected for every appliance for added safety. High voltage capacitors are used in appliances which basically need a high burst of energy. There are many options available that help customers redefine their technical and economic considerations depending on the function. According to their function and a size parameter, the high voltage capacitors make use of different dielectrics like plastic, polyester and polycarbonate.

7. Check with the ohmmeter connecting each input terminal. The meter should present a very low down reading (close up to zero ohms (0 O)) among these terminals. Also a great deal resistance stuck between these terminals specifies a fault in the transformer.

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