# How do you know if a capacitor is finished charging to its full potential capacidence?

How do you know if a capacitor is finished charging to its full potential? Also if you were to have a group of capacitors linked together in a series or parallel fashion how could you determine whether or not the capacitors were charged completely? I am mainly referring to polarized capacitors.

Q=Q

_{max}[1-e^{(-t/RC)}], where Q is the charge in the cap, RC is the the time constant, and t is the time since you started charging..00047(1-e^(-10/60))

Series connected capacitors rarely charge to identical voltages, because the capacitor values vary quite widely. When its essential, then high value resistors are connected across each cap.