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How to find emf

  1. Dec 19, 2012 #1
    1. The problem statement, all variables and given/known data
    http://i33.photobucket.com/albums/d86/warnexus/emf_zpsbff89890.jpg


    2. Relevant equations
    Current = (emf)/(resistance)

    Capacitance = (Charge)/(voltage)

    Stored energy = (Capacitance)(Volt ^ 2) /(2)

    3. The attempt at a solution

    I need to find current and resistance so I can find emf.

    capacitance = (charge)/(volt)

    stored energy = (charge(voltage)/(2)

    25 J (2) /(3C) = 50/3

    voltage is 50/3 or 17 V.
     
  2. jcsd
  3. Dec 19, 2012 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    This has nothing to do with either resistance or capacitance.

    You have a battery rated at "emf" volts and you have sucked 3 C (coulombs) of charge out of it. How much energy is that?
     
  4. Dec 19, 2012 #3
    thats right! volt is measured in joules per coulomb! got it thanks!
     
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