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Calculating emf

  1. Apr 2, 2013 #1
    1. The problem statement, all variables and given/known data
    What is the emf of the battery shown?

    there is an external resistance of 2.50 ohm and 4.0 A....The battery has an internal resistance of 0.50ohm

    2. Relevant equations

    V=Ir
    V= E +/- IR


    3. The attempt at a solution

    Since the current is going away the battery then i use the equation V= E - Ir
    To find the V of the whole battery V= IR, V=(4)(2.5) = 10V
    E= V + Ir
    E= 10 + (4)(0.5) = 12 V

    please check see if its right. If im not clear i can upload a picture.
     
  2. jcsd
  3. Apr 2, 2013 #2

    PeterO

    User Avatar
    Homework Helper

    Again your logic appears good - unless the diagram is quite unusual.
     
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