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)) %?