1. Use Excel to plot VAB VS. I (from Table 1). Independent variable I should go in the first column and V in the second column for Excel. Get the best fit line and equation of the line from Excel. Record the slope and yim of the best fit line below the plot. Using the slope of the line, calculate the internal resistance r and the emf of the battery. See the discussion below Eq. 1 in the Theory section. Record r and & and their percentage discrepancies from the known values