Current Electricity and Electrical InstrumentHard
Question
A series parallel combination of batteries consisting of a large number N = 300 of identical cells, each with an internal resistances r = 0.3 Ω, is loaded with an external resistance R = 10 Ω. 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
Options
A.2
B.3
C.4
D.6
Solution
Condition for maximum power is
Net internal resistance = Net external resistance
rnet = Rnet
= R
n2 =
n =
n = 3
Net internal resistance = Net external resistance
rnet = Rnet
= Rn2 =
n =
n = 3
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