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: Internal resistance

  1. Sep 24, 2008 #1
    1. The problem statement, all variables and given/known data

    A battery having an emf of 9.30 V delivers 103 mA when connected to a 60.0 ohms load. Determine the internal resistance of the battery.

    2. Relevant equations

    V = E - IR

    3. The attempt at a solution

    i plugged in 9.3 for V, .103 for I, and 60, for R.... and i got 15.48. red x... any suggestions?
  2. jcsd
  3. Sep 24, 2008 #2


    User Avatar
    Homework Helper

    What's wrong with just V = IR ?

    If you know what the Total Resistance is and it's in series with the 60 ohm resistor ...
  4. Sep 24, 2008 #3
    i dont understand what you mean. I dont know the relationship between R and internal resistance. and internal resistance is sooo not in my text book.. im def confused
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook