A battery has an emf ? and an internal resistance r. When
Chapter 21, Problem 121GP(choose chapter or problem)
Problem 121GP
A battery has an emf ε and an internal resistance r. When the battery is connected to a 25-Ω resistor, the current through the battery is 0.65 A. When the battery is connected to a 55-Ω resistor, the current is 0.45 A. Find the battery's emf and internal resistance.
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