Help on phasors and phase shifts with two AC voltage supplies

Discussion in 'Homework Help' started by Enigmatic Entity, Sep 30, 2009.

  1. Enigmatic Entity

    Thread Starter Member

    Feb 16, 2009
    19
    0
    Hello everyone,

    I'm currently doing a tutorial question for uni, and was wondering how I would go about answering a.) and b.) of the following question (see picture).

    The things I'm getting stuck on is the fact that there are two voltage sources (identical to each other) and also that the two main points, ground and Vout, are between components.

    I've been trying to think about what would happen if I started from V1 and went around clockwise, but I get stuck with the capacitor and the fact that I have to measure things from ground.

    Any pointers greatly appreciated. :)
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    You can use whatever polarity conventions you favor, but I would write

    -V1+VR+VC-V2=0
    where
    VC=capacitor voltage drop (top to bottom)
    and
    VR=resistor voltage drop (top to bottom)

    Note also that w.r.t ground
    VA=V1
    and
    VB=-V2
    and
    Vout=VA-VR=V1-VR
    and also
    Vout=VB+VC=-V2+VC
     
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