Showing posts with label ceramic capacitors. Show all posts
Showing posts with label ceramic capacitors. Show all posts

Monday, 27 May 2013

Capacitors

The electronic components that are used to store the charge are called Capacitors. This capability of capacitors to store the energy (Charge) is called capacitance. Capacitance is measured in Farads (F). Farad is a very high unit of capacitance. Lower units are Micro Farad (µF) and Pico Farad (pF).

Capacitor consists of two conducting plates that are separated by an insulating material which is known as dielectric. Capacitor offers very low impedance to AC but it blocks DC. The reason behind this is that
XC =1/2πfc and for AC frequency is 50-60 Hz but for DC frequency is 0 hence XC= Infinite.

Capacitors are classified on the basis of die electric used between them. Some well known types of Capacitors are as Follows:

1) Mica Capacitors: These types of Capacitors are constructed with the help of two Aluminium foils separated by a mica sheet. These plates are connected to two electrodes. The entire unit is encapsulated in a plastic housing. These type of Capacitors are used for small capacitance values ranging from 5 pF to 10µF. These Capacitors can operate at up to 500V and has leakage current about 1000MΩ.


















2) Paper Capacitors: These types of capacitors are