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Homework Help: Finding the EMF of the cell

  1. Sep 6, 2008 #1
    Finding the EMF of the cell....

    first post =)

    1. The problem statement, all variables and given/known data
    Find the EMF of the cell.
    (diagram has been uploaded)

    2. Relevant equations
    Resistors is series : Rs= R1 + R2 + R3
    Resistors in parallel: 1/Rp = 1/R1 + 1/R2 + 1/r3

    3. The attempt at a solution
    Firstly i re-drew the circuit in a more simple form, to see what resistors are in parralel and which ones are in series. I then found the total resistance in the parralel circuit part that contained the 0.2A current. after that i used : V=IR.
    My answer still seems incorrect as i got total EMF = 4.8V

    Attached Files:

  2. jcsd
  3. Sep 7, 2008 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Re: Finding the EMF of the cell....

    That would tell you the voltage across that branch (and all parallel branches), but that's not the EMF of the battery.

    Show exactly what you did, step by step.
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