RC circuit


E=5 V  R=1000 Ω  C=2 μF
Time Current
(in μA)		 Charge
(in μC)
Fraction of maximum charge (at t =
Fraction of maximum current (at t =

Tap on left/right halves of the graph area to highlight the values at a particular time (measured in multiples of time constant RC).

Charge on a capacitor varies with time in an RC circuit as

and the current in the circuit varies with time as

The plots of the equations are shown and you should be able to see the charge reaching 99.99% of its maximum value in 10RC (10 time constants).