Capacitors and Inductors

CAPACITORS

The capacitor is another important component of an electronic circuit. it stores electric charges. The simplest capacitor is made of two metal plates with a small gap between them. The small gap can just be air or any insulating material such as ceramic, mica, paper,paper, plastic, or electrolyte
.

 For more details:

 http://www.youtube.com/watch?v=zNpbdptwxlQ

http://www.youtube.com/watch?v=HRwgjwNdMWU&feature=related


      The capacity of the parallel plates to store charge or the electric capacitance of a pair of parallel plates depends on its dimensions. For a capacitor of fixed value, two equal parallel plates have a capacitance given by


                                       C = εA/ D

 where

               C = capacitance in farad (F)
               A = surface area of one plate (m²⁾
                    d= separation between plates (m) and
               ε = permittivity of the space between the plates

Above the formula shows that the closer the plates are to each other, the bigger their capacitance.  A bigger plate area A results in higher capacitance. Insulators inserted between the plates, which are called dielectrics, also affects the capacitance since they are of varying values of primitives.

INDUCTORS

    Any inductor is an electromagnet. Whereas a capacitor stores energy in the electric field in the space between the plates, an inductor stores energy in the magnetic field around its coil.


For more details:

http://www.youtube.com/watch?v=hov7mTQ8MUM
http://www.youtube.com/watch?v=TQ_ETfiyZU8
http://www.youtube.com/watch?v=NIr66Y_ciiA



Capacitors and Inductors are used in oscillator and tunning circuits of radio communication systems. On the transmission side, the oscillator circuit generates the radio frequencies which modulate the audio signals.