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Homework Help: Potential Difference Across an Inductor in an RLC circuit

  1. May 3, 2010 #1
    1. The problem statement, all variables and given/known data
    An alternating source drives a series RLC circuit with an emf amplitude of 6.0V, at a phase angle of +30deg. When the potential difference across the capacitor reaches its maximum positive value of +5.00V, what is the potential difference across the inductor?

    2. Relevant equations
    Vc=IcXc, VL=ILXL

    3. The attempt at a solution
    I don't know because I don't know what to do with the phase angle.
  2. jcsd
  3. May 4, 2010 #2


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    Homework Helper

    The phase angle of 30° means that the voltage leads the current by that angle. That is also the phase of the complex impedance: (XL-Xc)/R = tan(30°)

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