1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Can Somebody Check My Work For Me? Circuits

  1. Feb 21, 2010 #1
    Hi here is the problem:
    vg2ccx.jpg


    What I did was Z=[(XL-Xc)2+R2]1/2 = 5 ohm

    and then V/R = I = 110(2)1/2/5=31.1A

    For part B) I did V=L(di/dt)=-Lwsin(wt), and the peak amplitude is when sin(wt)=-1 and is 377V.

    Can someone tell me if what I did is right, or what is wrong?

    Thanks.
     
    Last edited: Feb 21, 2010
  2. jcsd
  3. Feb 21, 2010 #2

    kuruman

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Your impedance formula is incorrect. Also, what value did you use for ω?
     
  4. Feb 21, 2010 #3
    Sorry I meant +R not -R..but I used the right formula when calculating the value of 5. For w I used 2(pi)f=377 Hz
     
  5. Feb 21, 2010 #4

    kuruman

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Looks OK then. I assume that you plugged in the numbers and got XC and XL correctly.
     
  6. Feb 21, 2010 #5
    I did (wL-1/(wC)^2 for XL-Xc
     
  7. Feb 21, 2010 #6

    kuruman

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    That's fine. I hope you plugged in correctly.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook