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%
Correct Answer: A. 75%
Explanation
R = \(r_1 + R = 1 + 3 = 4\Omega\)
\(\frac{3}{4} \times \frac{100}{1} = 75\)%
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