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Friday, 3 February 2017

Details on capacitance and capacitors

CAPACITORS AND CAPACITANCE
A capacitor is any combination of two conducting bodies of any shapes and sizes separated by a small distance in space.
It is an electric circuit element used to store charge temporarily, consisting in general of two metallic plates separated and insulated from each other by a dielectric. Also called condenser
.
Conductors store charge.
Capacitance is defined as the amount of charge required to raise the potential by one unit.

In SI the capacitance are expressed in farads (F).
A farad is an enormous capacitance. Typical values for capacitors in devices range from Pico farads to microfarads.
Parallel Plate Capacitor

It consists of two plane parallel plates of area A and separated by a small distance d.

Let there be a charge  on one of the plates and  on the other and V be the potential difference between the plates,

Where, permittivity of free space
K- Dielectric constant of the medium
For vacuum and air,

Then capacitance of the capacitor, 

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