When a car's starter is in use, it draws a large current. The car's lights draw much less current. As a certain car is starting the current through the battery is 60.0 A and the potential difference across the battery terminals is 9.00 V. When only the car's lights have been used the current through the battery is 2.00 A and the terminal potential difference is 11.9 V. A) Find the battery EMF? b) what is its internal resistance?