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a chemical cell of internal resistance 1\(\Omega\) supplies electric current to an external resistor of...

Physics
WAEC 2005
a chemical cell of internal resistance 1\(\Omega\) supplies electric current to an external resistor of resistance 3\(\Omega\). Calculate the efficiency of the cell
  • A. 75%
  • B. 50%
  • C. 33%
  • D. 25%
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Correct Answer: Option A
Explanation
R = \(r_1 + R = 1 + 3 = 4\Omega\)

\(\frac{3}{4} \times \frac{100}{1} = 75\)%
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