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Homework Help: AC Circuits values problem

  1. Aug 7, 2011 #1
    1. The problem statement, all variables and given/known data

    A complex AC voltage is given by the equation
    v = 3e^j450t :
    Note the use of bold v to represent the complex voltage.
    For this voltage waveform, what are the values of
    -volltage amplitide
    -instantaneous voltage
    -graph it in a argand diagram at t=pi/1800

    2. Relevant equations



    3. The attempt at a solution
    -well so far i know the voltage amplitude is 3 volts
    -j is an imaginary number
    -the expansion is v=3(cos450t+jsin450t)

    not sure about the others
    Last edited by a moderator: May 21, 2018
  2. jcsd
  3. Aug 7, 2011 #2


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    Homework Helper

    I think you mean V = 3(cos450t+jsin450t)

    Which is comparable to the form V= V0(cosωt+jsinωt) where ω is the angular frequency.

    For the instantaneous voltage, are they asking it for the time at t = π/1800 ?
  4. Aug 8, 2011 #3
    dats right, so the frequency is 450/2pi
  5. Aug 8, 2011 #4
    but how can i draw the argand diagram?
  6. Aug 8, 2011 #5


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    Homework Helper

    Well in V = 3(cos450t+jsin450t)
    just put t= π/1800 and you will get a complex number in the form V = a+jb to draw which should be easy for you to do.
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