1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

RLC circuit in series

  1. Sep 28, 2010 #1
    1. The problem statement, all variables and given/known data
    A series RLC circuit consists of a 100 ohm resistor, a 0.10 H inductor, and a 100 micro farad capacitor. It is attached to a 120 V/60 Hz power line. What is the peak current, I?

    2. Relevant equations
    Z=sqrt(R^2+(omegaL - (omegaC)^-1))

    3. The attempt at a solution
    I=120/sqrt(100^2+(2pi(60)*.1 - (2pi(60)*100x10^-6)^-1)^2)=1.2
    The program is saying it's wrong.
    I'm confused what I'm doing wrong, exactly. I'm thinking the omega is wrong, but I don't know how I would get omega otherwise.
    Thanks for your help.
  2. jcsd
  3. Sep 28, 2010 #2
    I eventually figured it out... apparently 120 V is the rms value, which they clearly do NOT indicate what-so-ever... so my value of I was really I rms, and they just wanted it in I. My answer times sqrt(2) gave me the correct answer.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook