1. The problem statement, all variables and given/known data A battery with emf [tex]\epsilon[/tex] and internal resistance r is connected to a variable resistance R at points X and Y. Varying R changes both the current I and the terminal voltage Vxy. The quantities I and Vxy are measured for several values of R and the data are plotted in a graph, as shown above on the right. a. Determine the emf [tex]\epsilon[/tex] of the battery. b. Determine the internal resistance r of the battery. c. Determine the value of the resistance R that will produce a current I of 3 amperes. d. Determine the maximum current that the battery can produce. e. The current and voltage measurements were made with an ammeter and a voltmeter. On the diagram below, show a proper circuit for performing these measurements. Use A to represent the ammeter and V to represent the voltmeter. **Diagram is #4 from this link: http://mrmaloney.com/mr_maloney/ap/past-AP-tests/BII_91.pdf 2. Relevant equations [tex]\epsilon[/tex] = IR + Ir [tex]\Delta[/tex]V = IR 3. The attempt at a solution a) I know a battery is a constant source of emf. [tex]\epsilon[/tex] = IR + Ir [tex]\epsilon[/tex] = [tex]\Delta[/tex]V + Ir From the diagram: [tex]\epsilon[/tex] = (4-2) + Ir Help! What values do I use?