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Problem about rc and lr circuits!

  1. Dec 26, 2006 #1
    i hv done an experiment
    but why the phase differencr between the voltage and current for both LR and RC circuits are not equal to 90?
    moreover,how would a resisiance of a resistor affect the phase difference
    between voltage and currentin capacitor?:cry:
    at last,how would a resistor affect the phase difference between voltage and current in inductor???
     
    Last edited: Dec 26, 2006
  2. jcsd
  3. Dec 26, 2006 #2

    SGT

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    The voltage and current in a capacitor or in an inductor are 90 degrees out of phase.
    In an RC or LR circuit the voltage and current are out of phase by the angle of the total impedance Z = R + jX.
     
  4. Dec 26, 2006 #3
    but from my result,it dosen't equal to degree of 90:cry:
     
  5. Dec 26, 2006 #4

    SGT

    User Avatar

    There is no pure inductance or capacitance.
    A real inductor is made of a wound wire, so it has a resistance associated and this causes the phase shift to be different from 90 degrees.
    There is also a stray capacitance between turns of the coil, that contributes to alter the phase.
    In a capacitor the phenomenon is less important, but it has also a resistance and an inductance associated.
     
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