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Ohm's Law in Scalar Form

Internal resi...

Question

Internal resistance of a battery of 2volt terminal voltage is 0.2 ohm and current following through it is 0.5A.So emf of the battery will be:

A

1.9 V

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B

3 V

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C

2 V

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D

2.1 V

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Solution

The correct option is D $2.1 V$
From the figure,
The voltage drop across the internal resistance,
$V_{i} = i r = 0.5 \times 0.2 = 0.1 V$
Emf, $e = V + V_{i}$
$e = 2 + 0.1 = 2.1 V$
The correct option is D.

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