Question

A series and parallel combination of batteries
consisting of 300 identical cells, each with an
internal resistancer 0.312, is loaded with
an external resistance R= 10 N. The number
'n' of parallel groups consisting of an equal
number of cells connected in series, at which
the external resistance generates the highest
thermal power is​

Answer 1

Explanation:

We know that when external resistance is equal to internal resistance i.e. R = r then power withdrawn from battery is maxiumum. P

max

=

4R

ϵ

2

using this concept ,

For n rows the net eq resistance would be ,

Req=

nn

Nr

⟹

nn

Nr

=R

⟹ n=

R

rN

=

10

0.3×300

=3