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!

What is the Current?

  1. Feb 16, 2009 #1
    1. The problem statement, all variables and given/known data
    If the resistance of the device were reduced by 15.8 percent, what current would be drawn at 120 V?

    there was a first part of this question which i have already gotten. the question was
    An electrical device draws 2.56 A at 120 V. If the voltage drops by 15.8 percent, what will be the current, assuming nothing else changes? so the resistance is 46.875


    2. Relevant equations
    ok so i believe that i would just do 120/(.158x46.875)


    3. The attempt at a solution
    when i did this i got like 16 A and it was said to be wrong. i am confused on what i did wrong.
     
  2. jcsd
  3. Feb 16, 2009 #2

    Delphi51

    User Avatar
    Homework Helper

    Reducing by 15% means you keep 85% of the resistance. Multiply by .842, not .158.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: What is the Current?
Loading...