Charging the capacitor discharge time calculated

Charging the capacitor discharge time is calculated:
provided, V0 is the initial voltage on the capacitor;
Vu is filled capacitor end voltage value;
Vt of an arbitrary time t, the voltage on the capacitor.
Then,
Vt of + V0 = (Vu-V0) * [. 1-exp (-t / the RC)]

If the battery voltage E 0 of the capacitor C is charged via the resistor R to the initial value
V0 = 0, charging limit Vu = E ,
so that, at any time t, the voltage on the capacitor is:
Vt = E * [. 1-exp (-t / the RC)]
T = RCLn [E / (E-Vt)]
If the known voltage Vt across the capacitor at a certain time , t can be calculated according to the time constant.
Formula meanings:
completely filled, close Vt of E, infinite time;
when t = RC, the capacitor voltage = 0.63E;
when t = 2RC, the capacitor voltage = 0.86E;
when t = 3RC, the capacitor voltage = 0.95E;
when when t = 4RC, capacitor voltage = 0.98E;
when t = 5RC, capacitor voltage = 0.99E;
visible, after the RC 3 to 5, the basic end of the charging process.

Discharge time is calculated:
initial voltage of capacitor C through E R discharge
V0 = E, Vu = 0, so that the capacitor is discharged, at any time t, the voltage on the capacitor is:
Vt of E * = exp (-t / the RC)
T = RCLn [E / Vt]
above exp () denotes the exponential base e; Ln () is the logarithm to the base e.