A cell of electromotive force E and internal resistance r is connected across an external variable resistor R. Which of the following statements correctly describes the condition for maximum power dissipation in the external resistor and the efficiency of the power transfer at this condition?
Options:
- A: Power is maximum when R = r/2, and the efficiency of the circuit is 75%.
- B: Power is maximum when R = 2r, and the efficiency of the circuit is 33.3%.
- C: Power is maximum when R = r, and the efficiency of the circuit is 100%.
- D: Power is maximum when R = r, and the efficiency of the circuit is 50%.
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