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Math Help - capacitor

  1. #1
    Member
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    capacitor

    Hi,
    I am working with capacitor now and I have this question. I am applying a square wave (from 0 to 5V) on a RC circuit.
    At the output ( at the resistor) I get a positive and negative values? why is that ?
    I am suspecting the fact that the capacitor create a phase difference of -90 degree(between voltage and current)..but I cannot figure out the correct answer.
    please can someone help me?
    B
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by braddy View Post
    Hi,
    I am working with capacitor now and I have this question. I am applying a square wave (from 0 to 5V) on a RC circuit.
    At the output ( at the resistor) I get a positive and negative values? why is that ?
    I am suspecting the fact that the capacitor create a phase difference of -90 degree(between voltage and current)..but I cannot figure out the correct answer.
    please can someone help me?
    B
    The RC circuit is acting as a low-pass filter, by removing high frequency
    components you will be left with oscillations (typically at a frequency near
    the cut off) so when the voltage goes low the oscillations will sometimes
    take it negative.

    Google for Gibbs phenomenon.

    RonL
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