A cell of emf 1.5V having a finite internal resistance is connected to a load resistance of 2Ω. For maximum power transfer, the internal resistance of the cell should be
A
4Ω
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B
0.5Ω
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C
2Ω
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D
None of these
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Solution
The correct option is C2Ω
Given, Rl=2Ω total current (i)=1.52+r Pmax=i2R Pmax=2×1.52(r+2)2 Using maximum power transformation theorem, in a circuit a maximum power flows when internal resistance will be equals to load resistance. Hence, r=R=2Ω