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JAMB Physics 2024 Paper

Question : 104

Total: 125

\Omega

\Omega

resistor is

Solution:

Concept:

The efficiency of a cell is the fraction of the total power that is delivered to the external load resistor.

Explanation:

For a cell with internal resistance

r

and external resistance

R

, efficiency is:

\text{Efficiency} = \frac{R}{R + r} \times 100\%

Here,

R = 6\,\Omega

and

r = 2\,\Omega

. Substitute the values:

\text{Efficiency} = \frac{6}{6 + 2} \times 100\%

= \frac{6}{8} \times 100\% = 75\%

Therefore, the cell supplies

75\%

of its total power to the

6\,\Omega

resistor.

Answer:

D. 75%

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