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Symbols of Electric Components

A storage bat...

Question

A storage battery has e.m.f. $15$ volt and internal resistance $0.05 o h m$ . Its terminal voltage when it is delivering $10$ ampere is:

A

30 v o l t

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B

1.00 v o l t

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C

14.5 v o l t

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D

15.5 v o l t

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Solution

The correct option is C $14.5 v o l t$
$V = E - I R$
$E = 15 v$
$I = 10 A$
$R = 0.05 Ω$
$∴ V = 15 - (10 \times 0.05)$
$= 15 - 0.5$
$= 14.5 v$

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