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capacitors in series

Discussion in 'Misc Electronics' started by Ken O, Dec 22, 2004.

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  1. Ken O

    Ken O Guest


    This is something very basic, I have been using it for a while, When you two
    capacitors in series, you end up having the equivalent of one capacitor that
    is lower in Farad then the lowest capacitor. My question is ,WHY . One
    capacitor charges, well they all have to charge at the same time I suppose
    and also discharge at the same time. Would it have an accumulative effect ?


  2. Jim Backus

    Jim Backus Guest

    Hopefully this is easy and non-scientific to follow: Consider the
    simplest capacitor - two metal plates with an air gap between them.
    The wider the gap, the smaller the capacitance. When you put a second
    one in series you are effectively increasing the air gap, hence the
    capacitance is reduced.
  3. -------------
    Here's a way to think about it. Caps in series are the same as one cap
    with thicker dieletric, and thicker is lower capacitance. Capacitance
    goes like Capacitance=epsilon*Area/Distance. Distance being thickness.

  4. Ken O

    Ken O Guest

    Thanks for your help, very usefull.

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