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Determine the voltage across the 9.00-µF capacitor

  1. May 15, 2007 #1
    A 3.00-µF and a 5.00-µF capacitor are connected in series across a 30.0-V battery. A 9.00-µF capacitor is then connected in parallel across the 3.00-µF capacitor. Determine the voltage across the 9.00-µF capacitor.

    I have no idea what to do.
     
  2. jcsd
  3. May 15, 2007 #2

    Astronuc

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    Staff: Mentor

    Capacitors in series split the voltage, but differently than resistors.

    Capacitors in parallel experience the same voltage drop.

    So the 3 and 9-µF capacitors are put in parallel, what is the effective capacitance. Then what is the voltage drop across that capacitance? Hint - it splits the 30 V with the 5-µF capacitor.

    What do you know about capacitance of parallel and series combinations of capacitors?
     
  4. May 15, 2007 #3
    Here is what I did so far:

    Cp = 12 uF
    Cs = 5 uF
    Ct = 1/12 + 1/5 = 3.529 uF
    q = CtV = 1.0588e-4 V
    Vt = 30V = V1 + V2
     
  5. May 15, 2007 #4

    Astronuc

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    Staff: Mentor

    Last edited: May 15, 2007
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