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: Calculating the power transformed in a real battery

  1. Apr 21, 2016 #1
    1. The problem statement, all variables and given/known data
    There is a battery producing emf V and the current around the circuit is I. The battery has an internal resistance of R. What is the power transformed by the battery

    2. Relevant equations
    P = VI
    P= I2R

    3. The attempt at a solution
    Maybe P=VI+I2R because there is some electrical energy converted in the cell resulting in the power VI And then the same power is used to create power I2R in the internal resistance.
    So shouldn't it be the sum of the two powers because it is the total power transformed.
     
  2. jcsd
  3. Apr 21, 2016 #2

    CWatters

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    I think you are on the right lines but your explanation isn't very clear.

    What do you mean by "then the same power is used" ?
     
  4. Apr 21, 2016 #3
    Electrical power produced by cell = Input power to internal resitance
     
  5. Apr 22, 2016 #4

    CWatters

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted