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Acell of internal resistance r drives a ...

Acell of internal resistance `r` drives a current through an external resistance `R`. The power delivered by the cell to the external resistance is maximum when

Text Solution

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` i= ( E) / ( R + r ) `
` P= i^ 2 R = (E ^ 2 R ) /((R + r )) `
for maximum power ` (dP ) /(dR ) = 0 rArr R = r `
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