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What is the voltage across the resistor?

  1. Apr 19, 2013 #1
    1. The problem statement, all variables and given/known data

    The amplitude of the voltage across an entire series circuit is 17 V. The inductor alone has an amplitude of 30 V and across the capacitor it is 22 V. To the nearest tenth, what is the voltage across the resistor?


    2. Relevant equations



    3. The attempt at a solution

    (17+8i)(17-8i)

    289+64
    square root of 353
    18.8
     
  2. jcsd
  3. Apr 19, 2013 #2

    gneill

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    Staff: Mentor

    Hello JayLewis, Welcome to Physics Forums.

    Can you explain the reasoning behind your attempt?
     
  4. Apr 20, 2013 #3
    I was trying to follow steps from handout

    I was trying to follow steps from handout..this is the first time we have worked onthis and I don't understand it.
     
  5. Apr 20, 2013 #4

    gneill

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    Staff: Mentor

    Okay. I see that you're making use of complex numbers, so I assume that you're familiar with (or at least learning about) the concept of complex impedance and voltage and current. Is that right?
     
  6. Apr 20, 2013 #5
    we are learning about it now

    but the instructions aren't very clear

    here is the rest of my work:

    374-510i
    _________
    484+900

    374-510i
    _________
    1384

    .27-.37i
    .07+.14
    .21
     
  7. Apr 20, 2013 #6

    gneill

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    Staff: Mentor

    It's difficult to comment on your work since it's not annotated. What is it you're doing here?

    If I may make a suggestion, suppose you consider the series RLC circuit being driven by a fixed AC current source. What would be the complex values of the potentials across the capacitor and inductor?
     
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