CHARGING AND DISCHARGING OF A CAPACITOR

CHARGING AND DISCHARGING OF A CAPACITOR:-

Capacitor never charges or discharges alone but at least one resistance is attached with it.

Its charging and discharging behaviours both are not linear (straight line) but it is exponential (curved).

How long a capacitor will take in order to charge or discharge depends on product RC of circuit known as time constant that is the product of resistance (R) and capacitance (C) is constant which is time constant.

ENERGY STORED IN CAPACITOR

ENERGY STORED IN CAPACITOR:-

     We know that capacitor is charge storing device. Its charge storing ability that is capacitance increases in the presence of dielectric medium as explained in the previous topic. Capacitor store its energy inside electric field which can be calculated as follow:                                          

We know that Potential Difference=  Work

                                                     Charge

Or V = Energy

           Charge   

Or Energy = V.Q ----------(i)

CAPACITORS & CAPACITANCE OF PARALLEL PLATE CAPACITOR

CAPACITOR:-

               Capacitor is a charge storing device which consists of two parallel metal plates of same nature, surface area, magnitude of charge on each plate and surface charge density separated by small distance as
shown in fig
Magnitude of charge(Q) stored on each plate is directly proportional to potential difference(V) applied by the battery ie