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Non-Ideal Battery

A primary cel...

Question

A primary cell has an e.m.f. of $1.5 v o l t$ . When short-circuited it gives a current of $3$ ampere. The internal resistance of the cell is:

A

4.5 o h m

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B

2 o h m

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C

0.5 o h m

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D

(1 / 4.5) o h m

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Solution

The correct option is C $0.5 o h m$
$r = E / I = 1.5 / 3 = 0.5 o h m .$

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