In this example, we will see how internal resistance affects the performance of a battery. As a flashlight battery (or a car battery, for that matter) ages, its emf stays approximately constant, but its internal resistance increases as its electrochemical Part A - Practice Problem: An old battery with an emf of 9.0 V has a terminal voltage of 8.1 V when it is supplying a current of 3.0 mA. What is the internal resistance of the battery? electrodes gradually corrode. A fresh battery has an emf of 1.5 V and negligible internal resistance. When the battery needs replacement, its emf is still 1.5 V, but its internal resistance has increased to 1000 N. If this old battery is supplying 1.0 mA to a lightbulb, what is its terminal voltage? Express your answer to two significant figures and include the appropriate units. Value Units r =

In this example, we will see how internal resistance affects the performance of a battery. As a flashlight battery (or a car battery, for that matter) ages, its emf stays approximately constant, but its internal resistance increases as its electrochemical Part A - Practice Problem: An old battery with an emf of 9.0 V has a terminal voltage of 8.1 V when it is supplying a current of 3.0 mA. What is the internal resistance of the battery? electrodes gradually corrode. A fresh battery has an emf of 1.5 V and negligible internal resistance. When the battery needs replacement, its emf is still 1.5 V, but its internal resistance has increased to 1000 N. If this old battery is supplying 1.0 mA to a lightbulb, what is its terminal voltage? Express your answer to two significant figures and include the appropriate units. Value Units r =