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about capacitor

Discussion in 'Electronic Basics' started by jason, Mar 3, 2005.

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  1. jason

    jason Guest

    Hello All

    Can anyone enligthen me about how a the capcitor charging and
    discharging in a configuration of a battery(and ac power supply) and
    capacitor in series?
    I am wondering if the the charge flow can goes through the capacitor
    plates? How actually the flow of electron and current to the capacitor
    at two side of the battery terminal(ac signal)?
    Kindly help me to understand this.
    If there is any online document that explains this well, kindly show me
    the link

    Thank you

    rgds and thanks
    Jason
     
  2. The idea behind capacitors is really simple. At their simplest, they are
    just two electrically conductive plates separated by a thin insulating
    barrier. Electrons repel each other, and so if you force electrons onto
    one of the plates, it'll repel the electrons on the other plate, making
    them move away and out the other terminal. The way you change the number
    of electrons on the plate is to change the voltage between the plates.

    This makes it seem like the electrons are moving through the plate, but
    they really aren't, they are just acting like they are, when the voltage
    changes. Once the voltage stops changing, an arbitrary DC voltage can be
    across the plates, and no current will flow.

    The equation that describes this is

    current = capacitance * rate of change of voltage over time.

    --
    Regards,
    Robert Monsen

    "Your Highness, I have no need of this hypothesis."
    - Pierre Laplace (1749-1827), to Napoleon,
    on why his works on celestial mechanics make no mention of God.
     
  3. jason

    jason Guest

    Thanks a lot Robert
    Your answers clear my doubts
    :)


    rgds and thanks
    Jason
     
  4. Guest

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