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A question about uncertainty using a regression line and experimental data

  1. Dec 13, 2009 #1
    1. The problem statement, all variables and given/known data
    I'm new to uncertainty, so I needed a little assistance. The circuit in this experiment was simple, a dry cell connected to a variable resistor. I used an ammeter on the circuit and used a voltmeter across the resistor and took some measurments.

    The experiment was to calculate EMF and Internal resistance using the results we obtained by plotting a VI graph.

    The ammeter and voltmeter were digital, their minimum display were 0.01V & 0.01A

    Can anyone explain to me how to get the uncertainty for r and for ξ?

    2. Relevant equations
    http://img686.imageshack.us/img686/1408/29533548.jpg [Broken]

    If the image doesn't work: http://img686.imageshack.us/img686/1408/29533548.th.jpg [Broken]

    3. The attempt at a solution
    100(0.01/(5.83-0.45))+(0.01/(1.35-0.10)) %?
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Dec 13, 2009 #2


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