First in Circuit A: I hook up a battery with a voltage of V up to a capacitor C1. Once C1 is fully charged it has 6+ on its positive plate and 6- on the negative plate. Given it's fully charged, the +terminal of the battery and the +plate are in electrostatic equilibrium. Since they are both in electrostatic equilibrium AND are connected together by a conducting wire, they can be considered to be one large conductor with the same electric potential of V Now in circuit B: There are two capacitors in series; C2 and C3. Once fully charged, the +plate of C2 and the the +terminal of the battery are in electrostatic equilibrium and share the same electric potential because they are connected by the conducting wire. C2 and C3 duplicate capacitors that share the same specs as C1 So I'm struggling with two things. 1) Capacitors in series have the same magnitude of charge on all of the plates. This number comes from limited amount of charge that is available on the middle plates of the capacitors that are circled with purple. I understand that no charge can be added or subtracted from this area because it's isolated. What I don't understand is: Why is the amount of amount of charges inside the purple area able to limit how much charge the battery dumps onto the +plate of C2. Why can't +6 be added onto the +plate (like we see in circuit A) instead of only being limited to +3 (like we see in circuit B). 2) How can the +plate of C1 and the +plate of C2 share the same specs BUT have different amounts of charge AND be the same electric potential when hooked up to the same battery. I can perform the math get the correct results, but I'm having a hard time coming up with the intuition to satisfy my answers. Thanks to anyone who responds. It's much appreciated.