1. What are the experimental values for both and r? Determine these two values using the data from your first graph and Equation 2.

2. Using your second graph, determine your experimental value of Pmax and compare it with the theoretical value for 2/4r. From your graph determine the value of R for which power is a maximum (Pmax); compare this value of R with r.

3. Show that at maximum power output, the terminal voltage of the battery is half its EMF.

4. Why would batteries with high current capacity have a lower internal resistance than batteries with a low current capacity? Consider the difference between 12 V car batteries and 12 V flashlight batteries. While both batteries supply the same voltage (12 V) of EMF, they have considerably different applications.