question_answer

AA cell of internal resistance r drives current through an external resistance R. The power delivered by the cell to the external resistance will be maximum when :- [JEE Main 8-4-2019 Afternoon]

A) R = 1000 r

B) R = 0.001 r

C) R = 2r

D) R = r

Correct Answer: D

Solution :

[d]

Current

Power generated in R

for maximum power