Finding voltage and phase

Discussion in 'Homework Help' started by gbox, Dec 31, 2015.

  1. gbox

    Thread Starter Member

    Dec 29, 2015
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    Find V_ab and |V_ab| and the phase of V_ab.

    [​IMG]

    I thought about using Thevenin, but than I thought that the elements above AB are the same as under AB.

    Or I can just say that [tex]V_AB=V_source-Z_R-( V_source-Z_C)[/tex]?
    How should I approach this?
     
    Last edited: Dec 31, 2015
  2. WBahn

    Moderator

    Mar 31, 2012
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    Do you know about complex impedance?
     
  3. gbox

    Thread Starter Member

    Dec 29, 2015
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    I know that
    Code (Text):
    1. [plain][tex]V_source=V_in*e^{\omega t} Z_R=R and Z_C=\frac{1}{\omega c i}[/tex][/plain]
     
  4. gbox

    Thread Starter Member

    Dec 29, 2015
    42
    0
    Here is the attempt
    [​IMG]

    [​IMG]
     
  5. WBahn

    Moderator

    Mar 31, 2012
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    Okay, so if you were asked merely to find the voltage at Node A, could you do it?

    If you were asked to merely find the voltage at Node B, could you do it?

    If so, recognize that V_ab is, by definition, the voltage at Node A minus the voltage at Node B.
     
  6. gbox

    Thread Starter Member

    Dec 29, 2015
    42
    0
    I have used voltage divider is it right?
     
  7. WBahn

    Moderator

    Mar 31, 2012
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    Your image capture doesn't have enough contrast for my tired old eyes to read easily, but it appears you are starting out on the right path.
     
  8. anhnha

    Active Member

    Apr 19, 2012
    773
    45
    Your approach using voltage divider is right but you need to review the formula to calculate voltage across each element of a voltage divider.
     
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