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Homework Help: Internal resistance, emf UNCERTAINTIES

  1. Sep 11, 2010 #1
    1. The problem statement, all variables and given/known data
    "From your graph, calculate the EMF and internal resistance of your cells. Include uncertainties in your calculations"

    Now I know how to work out the emf and int. resistance, but I am just not sure about how to incorporate uncertainties.

    2. Relevant equations
    y = mx + c
    Vo = -rI + ε

    3. The attempt at a solution
    Now the uncertainty for my Vo measurement is ±0.10V and current measurements is ±0.10A.
    the equation of the line is y = -0.12x +2.1
    so the Int. resistance is 0.12ohms and the emf is 2.1V, but what are the uncertainties on these values???
  2. jcsd
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