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.
