1. The problem statement, all variables and given/known data A variable resistor, R, is connected to the terminals of a battery (dashed box in the diagram). The graph below shows data collected in the circuit as R is varied. What is V0, in volts? What is the internal resistance, r, in ohms? 2. Relevant equations Ohm's Law 3. The attempt at a solution I know that for this case, Vo will be found where the current is calculated to be at its lowest. from the graph that i am given, It is not clear where it will equal zero, as for the internal resistance, i know that I=ε/r so -r=dV/dI the slope of a V vs I graph will give the internal resistance.