Voltage across a Capacitor

Thread Starter


Joined Sep 22, 2011
Say I have a capacitor in series with a resistor, and those components are in parallel with a resistor. This circuit is being charged by a current source. The circuit has been connected and on for a long time, so the capacitor is charged. How can I find the voltage across that capacitor? Here is a crude drawing to clarify, Is=Current Source, RΩ=Resistor, C=capacitor.

l l l
l l l
l l C
l l l


Joined Jul 31, 2011
If the circuit has settled, then the capacitor is not playing any further part, and could be removed from the circuit. I'm not sure I understand the diagram, but, reading the words, it sounds as though everything is now at a potential equal to IR (where R is the parallel resistor). So the capacitor will be charged to this value.