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Homework Help: Voltage drop across capacitor

  1. Jul 1, 2016 #1
    1. The problem statement, all variables and given/known data
    I'm trying to calculate the voltage drop across a 60uF and a 30uF capacitor in series, powered by 60V. Is the formula for voltage drop across capacitor opposite of the formula for resistor, where resistor is R1=R1/(R1+R2) while capacitor is C1=C2/(C1+C2)?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jul 1, 2016 #2


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    2017 Award

    Staff: Mentor

    The symbols on the left side don't make sense. The right side is useful, but you should probably derive those equations to be sure.
  4. Jul 1, 2016 #3
    My bad, the eqs are supposed to be multiplied with the total voltage.
  5. Jul 1, 2016 #4


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    Staff: Mentor

    It is far better that you be confident at deriving such formula yourself using basic knowledge.

    The crux of the matter is that when connected to a source, equal amounts of charge are added to each of the series-connected capacitors.
    Use this fact, together with Q = C·V, to confirm or disprove the formula you wrote.
  6. Jul 4, 2016 #5

    rude man

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    Homework Helper
    Gold Member

    Still your bad. R1=R1/(R1+R2) ??? Etc.
  7. Jul 5, 2016 #6

    My bad.
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