A chemical cell of internal resistance 1Ω supplies electric current to an external resistor of resistance 3Ω. Calculate the efficiency of the cell.

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A. 75%
B. 50%
C. 33%
D. 25%

Correct Answer: Option A

A. 75%

Explanation

R = r1+ R = 1+3 = 4Ω

¾×100 = 75%

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