1. The problem statement, all variables and given/known data imgur link: http://i.imgur.com/TWB5rRu.png 2. Relevant equations 3. The attempt at a solution I can find the equivalent capacitance, 10F, but I'm not really sure how to find the equiv. Thev. voltage. I figured that with the voltage source present, half the voltage will be lost across that first capacitor (since the next two parallel caps have an equivalence of 5F as well), so therefore at the very least in the Thev equiv circuit we should be seeing 22.5 V across the terminals. But the answer in the back gives Vth as 15V, less than 22.5. How does one find the Vth?