Question on: JAMB Physics - 2017
A cell of internal resistance 2 π supplies current to a 6 π resistor. The efficiency of the cell is
A
12.0%
B
25.0%
C
33.3%
D
75.0%
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Correct Option: C
Internal resistance determine the maximum current that can be supplied
Efficiency = (\frac{r}{R}) × 100
= (\frca{2}{6}) × 100
= 33.3%
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