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Homework Help: Polar coordinates of complex impedance

  1. Jul 2, 2011 #1
    The question is: "In polar coordinates, what is the impedance of a circuit that has an admittance of 7.09 millisiemens at 45 degrees?"

    The official answer is: "141 ohms at an angle of -45 degrees".

    I don't understand this. 7.09 millisiemens is 141 ohms, and the positive phase angle indicates inductance, IOW a positive y value.

    It seems the correct answer should be 141 ohms at an angle of 45 degrees, not -45 degrees.

    Please help me understand this.
  2. jcsd
  3. Jul 2, 2011 #2


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    Last edited by a moderator: Apr 26, 2017
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