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: RMS Current HeLp

  1. Feb 27, 2008 #1
    RMS Current...HeLp!!!

    1. The problem statement, all variables and given/known data
    The primary coil of a transformer is connected to a 130 V/60 Hz wall outlet. The secondary coil is connected to a lamp that dissipates 64 W. What is the rms current in the primary coil?

    2. Relevant equations

    3. The attempt at a solution
    I = P/V
    but I don't have P for the primary
  2. jcsd
  3. Feb 27, 2008 #2


    User Avatar
    Homework Helper

    If the transformer is ideal then the power output is the same as the power input.
  4. Feb 28, 2008 #3
    So it is 64W??
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook