Question

two identical cells either in series or in parallel combination gives the same current of o.5 ampere, through external resistance of 4 ohms . find the emf and internal resistance of each cell ​

Answer 1

Answer:

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Explanation:

Let voltage of each cell is = E, internal reistance of each cell is = r

When cells are in series-

Effective voltage of circuit = E+E=2E

And effective resistance of circuit = r+r+2=2(1+r)

Current I

1

=

(1+r)

E

When cells are in parallel-

Effective voltage of circuit = E

Effective resistance of circuit = r∣∣r+2 =

2

r

+2=

2

r+4

Current I

2

=

r+4

2E

As I

1

=I

2

⟹

(1+r)

E

=

(r+4)

2E

⟹r=2Ω

Let voltage of each cell is = E, internal resistance of each cell is = r

When cells are in series-

Effective voltage of circuit = E+E=2E

And effective resistance of circuit = r+r+2=2(1+r)

Current I

1

=

(1+r)

E

When cells are in parallel-

Effective voltage of circuit = E

Effective resistance of circuit = r∣∣r+2 =

2

r

+2=

2

r+4

Current I

2

=

r+4

2E

As I

1

=I

2

⟹

(1+r)

E

=

(r+4)

2E

⟹r=2Ω

Answer 2

Answer:

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