Question

Two identical cells whether joined in series or in parallel give the same current, when connected

to an external resistance of 1 ohm. Find internal resistance of each cell.​

Answer 1

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EMF, Terminal Voltage and Internal Resistance and Problems on It

N identical cells, whether ...

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Asked on December 27, 2019 by

Saisha Adnaan

N identical cells, whether joined together in series or in parallel, give the same current, when connected to an external resistance of R. The internal resistance of each cell is

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ANSWER

Let E be the emf of each cell and r be the internal resistance of each cell.

In series, net emf =NE and net internal resistance =Nr

Thus, current: i

S

=

Nr+R

NE

In parallel, net emf =E and net internal resistance =

N

r

Thus, current: i

P

=

r/N+R

E

Here, i

S

=i

P

or,

Nr+R

NE

=

r/N+R

E

or, Nr+R=r+NR

or, R(1−N)=r(1−N)

or, r=R

Answer 2

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