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Homework Help: AC Circuit with possibly nodal analysis

  1. Nov 21, 2013 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    impedance equations for capacitors and inductors

    3. The attempt at a solution

    I thought something like that might do and then just do a matrix and solve for Va, but im having second thoughts seems like im over doing it.
  2. jcsd
  3. Nov 21, 2013 #2


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    Homework Helper

    Your handwriting is hardly readable. Why don't you type in your work?

    Check your writing if it is at least dimensionally correct.

    Zc is wrong.

    Voltage divided by impedance can not be voltage, so your equation for Va and Vb are wrong.
    Check what impedances are parallel / series.

    If you use complex impedance, use also the complex form of the voltage.

  4. Nov 21, 2013 #3
    Because that would take me the whole night.

    Sorry both equations are suppose to equal to zero, kirchoffs current law, right ?

    For Zc, would it be -200i ?

    and the voltage as 300 @ 0 degrees ?
  5. Nov 21, 2013 #4

    this is what I was basing myself on if its any help.
  6. Nov 21, 2013 #5


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    Homework Helper

    I see you consider your time more dear than the time of your helpers.

    Yes, Zc=-200i.

    Yes, the sum at a node is zero.

    Yes, the generator voltage is 300 V @ 0 degrees.

  7. Nov 21, 2013 #6
    Alright thank you, sorry for the crappy handwriting ill type it out next time
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