# show all work and highlight your answers. you very much. Have a great weekend. Transcribed Image Text: In this example, we will see how internal

show all work and highlight your answers. you very much. Have a great weekend. Transcribed Image Text: 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
Part A – Practice Problem:
resistance increases as its electrochemical
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 =