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A cell of internal resistance r drivers...

A cell of internal resistance r drivers current through an external resistance R. The power delivered by the to the external resistance will be 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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