What Is Capacitance or capacitor

 Capacitance:-

The property of a capacitor to 'store electricity' may be called its capacitance.

As we may measure the capacity of a tank, not by the total mass or volume of water it can hold, but by the mass in kg of water required to raise its level by one metre, similarly, the capacitance of a capacitor is defined as "the amount of charge required to create a unit p.d. between its plates."

Suppose we give Q coulomb of charge to one of the two plate of capacitor and if a p.d. of V volts is established between the two,then its capacitance is

       Q
C=----------
       V

      Charge
=-----------------
          p.d

Parallel plate capacitor

Hence, capacitance is the charge required per unit potential difference.

By definition, the unit of capacitance is coulomb/volt which is also called  farad.


So, 1 Farad=1 Coulomb/volt


One Farad is defined as the capacitance of a capacitor which requires a charge of One coulomb to establish a p.d of one volt b/w its plates.

One farad is actually too large for practical purposes. Hence, much smaller units like microfarad,nano farad,micro-micro farad,pico farad are generally used.

1μF=10⁻⁶ F
1nF=10⁻⁹F
1μμF=10⁻¹²F

Incidentally, capacitance is that property of a capacitor which oppose any change of voltage accross it.




ये जरूर पढ़ें....👇
Energy Stored In A Capacitor




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