Student Response Value Correct Answer Feedback A. zero B. 18 W 54 W 0% D. 72 W E

Question

Student Response Value Correct Answer Feedback A. zero B. 18 W 54 W 0% D. 72 W E. none of the above Score: 0/1
The correct answer was B. 18W I don't know exact why the answer is 18W...the automated quizanswer could be wrong..if not then please explain. A battery of emf 24 V is connected to a 6- resistor. As a result, a current of3 A exists in the resistor. The power dissipated internally in thebattery is: Student Response Value Correct Answer Feedback A. zero B. 18 W C. 54 W 0% D. 72 W E. none of the above Score: 0/1

Explanation / Answer

    emf of the battery, = 24 V     External resistor, R = 6     Current, i = 3 A     Let        Internal resistance of the battery= r     emf , = I ( R + r )            24 = 3 ( 6 + r )                8 = 6 + r                  r = 2    Power dissipated internally in thebattery,   P = I2 r                                                                        = 32 * 2                                                                     = 9 * 2                                                                     = 18 W

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