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A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The...

Physics
JAMB 1988
A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The efficiency of the cell is
  • A. 12.0%
  • B. 25.0%
  • C. 33.3%
  • D. 75.0%
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Correct Answer: Option D
Explanation
Efficiency = \(\frac{IR}{I(R + r)}\) x 100

= \(\frac{6}{I(2 + 6)}\) x 100

= 75%
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