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: Average power in AC circuit

  1. Apr 16, 2010 #1
    1. The problem statement, all variables and given/known data

    Given resistance of circuit 68 W, I(max) = .191 A, V(max) = 22.5, what is the average power of this circuit?

    2. Relevant equations

    P(avg) = I(avg)V(max)

    3. The attempt at a solution

    I took .191 and divided by sqrt(2) to get the rms current and multiplied by the max voltage 22.5. Not getting the right answer, though...
  2. jcsd
  3. Apr 16, 2010 #2


    User Avatar
    Homework Helper

    P(avg) = I(avg)V(max)
    It should be
    P(avg) = I(avg)V(avg)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook