The unit of capacity is the Farad (f) and can be defined as the storage of one Coulomb on the difference of potential of 1 Volt. Types of actuais Condensing condensers Stop beyond the condenser of Leyden, Currently, the condensers can be classified in electrostatic and electrolytic. The first ones can be fixed or changeable. The fixtures can be of dielectric of paper, plastic film, ceramics, glass, mica. The 0 variable can be of dielectric of air, plastic film, ceramic. Condenser of Plates Parallel bars the capacity of a condenser of plates parallel bars constituted by two identical plain electrodes in area, separate at a distance the constant d, is approximately mathematically is equal: Where: C – capacity in Farads 0- is the electrostatic permissividade of the vacuum or free space r – is the dielectric constant or relative permissividade of the used insulator.

Association of Condensers the condensers can be associates in parallel series or. In the association in series, the chain is equal in all the condensers, however the tension is divided of an inversely proportional form to the capacity. As it can below be seen in the figure: It matters to emphasize that In the association in parallel, all the condensers receive the same tension however the chain is divided enters they in the reason directa of the capacity. Below, parallel configuration reveals to it and the form as if it can calculate the capacity equivalent of parallel the capacitive circuit in Application of the condendensadores the condensers are used in circuits of filtering to diminish the undulation (ripple) So used in the devices sound equalisers, others in receivers of radio to eliminate noises, others in columns of sound to separate to the signals for the diverse altifalantes in agreement its frequency (acute, average, serious). Nos receiving of radio condensing air 0 variable are used to syntonize the station desired for variation of the frequency of oscillation of the condenser with a bobbin.