Question

A cell of internal resistance r connected across an external resistance R
can supply maximum current when
(A) R=r
(B) R>r
(C)
R =
(D)
R= 0​

Answer 1

Answer:

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Answer 2

A cell having internal resistance r when connected across an external resistance R will supply maximum current when:

(A) R=r

This can be calculated in the following ways:

• We know that, in series combination of cells, Current I = nE / ( nr +R′ )

• And in parallel combination of cells, I′ = E / [ (r/n)+R​ ]

• Now, if I = I′ then,

        nE / ( nr +R′ ) + E / [ (r/n)+R​ ] =  nE / ( r + nR​ )

• Thus, it is possible if  R=r.