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Homework Help: Capacitance and impedence?!

  1. Feb 25, 2016 #1
    1. The problem statement, all variables and given/known data
    This is not necessarily a homework question, just a conceptual one.

    I was reading up on capacitors, and an example said that a 25uF capacitor has TWICE the impedence of a 50uF capacitor. Can someone explain what this means? I would have thought that a capacitor with higher capacitance would impede a circuit more...

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Feb 25, 2016 #2


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    Homework Helper
    Gold Member

    Do you have the formula for capacitive reactance? It clearly tells you that capacitive reactance is inversely proportional to the capacitance.
  4. Feb 25, 2016 #3


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    Staff: Mentor

    You could make a 25μF capacitance by connecting two 50μF capacitors in series. For the pair in series you have double the impedance of a single capacitor because impedances in series add.
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