A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.6 V

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A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.6 V when it is delivering 20.0 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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