1. Not finding help here? Sign up for a free 30min 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!

Power transformed by battery B

  1. Oct 18, 2015 #1
    1. The problem statement, all variables and given/known data
    image.jpg
    image.jpg
    2. Relevant equations
    P=IV

    3. The attempt at a solution
    I used the terminal voltage of battery B, that is I minus the voltage across the internal resistance of battery B from the e.m.f. of battery B, then I multiply it with the current which is 2.5A (calculated earlier) . But it should be just the e.m.f. of battery B multiply the current. Why the e.m.f. and not the terminal p.d.?
     
  2. jcsd
  3. Oct 18, 2015 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    That's probably a matter of definition of "power transformed by battery B". One calculation gives the power that actually leaves the battery, one gives the power that is required from the energy source within the battery (a part of it will heat the battery).
     
  4. Oct 18, 2015 #3
    Got it, thanks
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Power transformed by battery B
  1. Power in batteries (Replies: 2)

  2. Power in transformers (Replies: 2)

  3. Power and Batteries (Replies: 0)

Loading...