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: Electric currents, etc etc

  1. Apr 23, 2005 #1

    I have a question to ask and was wondering if you guys could help me.

    5.) A computer has a 300-W power supply. If household voltage is 120 V, how much current will flow through the computer?
    A. 0.4 A
    B. 2.5 A
    C. 180 A
    D. 420 A
    E. 36,000 A

    I picked B. I used the equation Electric power= current x voltage and changed it so current=power/voltage...which is how i got 2.5 A.


  2. jcsd
  3. Apr 23, 2005 #2
    Yup, P = IV, so I = P/V = 300/120 = 2.5
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook