A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.4 V when it is delivering 16.0 W of power to an external load resistor R. (a) What is the value of R? (b) What is the internal resistance of the battery?

Principles of Physics: A Calculus-Based Text
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Chapter21: Current And Direct Current Circuits
Section: Chapter Questions
Problem 33P: A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.6 V when it is delivering...
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A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.4 V when it is delivering 16.0 W of power to an external load resistor R.

(a) What is the value of R?
(b) What is the internal resistance of the battery?
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