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%
Verified Correct Answer: A.
Physical Principles & Numerical Solution
R = \(r_1 + R = 1 + 3 = 4\Omega\)
\(\frac{3}{4} \times \frac{100}{1} = 75\)%
Source: Myschool Past Questions Archive (Record #34530)