plz help !!!!circuits

Discussion in 'Homework Help' started by kitibwa, Apr 22, 2008.

  1. kitibwa

    Thread Starter New Member

    Apr 10, 2008
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    see attachment
     
    • qtn.txt
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  2. Caveman

    Active Member

    Apr 15, 2008
    471
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    What's the deal? You have time for four exclamation marks, but not to type the details to your question? Type it out for cripes sake!
     
  3. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
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    Can you scan the question and upload it as an attachment?

    Dave
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    It is just the graph of a cosine with t>0 but with double the frequency of an ordinary cosine graph. Also to amplitude is not from 1 to -1 but from 10 to -10.
     
  5. Caveman

    Active Member

    Apr 15, 2008
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    That's what I thought, but then I noticed that he defined V(t), but asked for i(t).
     
  6. mik3

    Senior Member

    Feb 4, 2008
    4,846
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    If the voltage is applied on a resistor, the current (i(t)) will have the phase as the voltage but divided by the resistors value.

    If the voltage is applied to an inductor the current will lag the voltage waveform by 90 degrees, thus it will be a sine wave. Also divide by the reactance to find its amplitude.

    If the voltage is applied to a capacitor the current will lead the voltage by 90 degrees, thus it will be a sinewave. Also divide by the reactance to find its amplitude.
     
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