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  4. A storage battery is connected to a charger for charging with a voltage of 12.5 volts. The internal resistance of the storage battery is 1 Ω. When the charging current is 0.5 A, the emf of the storage battery is

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Q. A storage battery is connected to a charger for charging with a voltage of $12.5$ volts. The internal resistance of the storage battery is $1 \,\Omega$. When the charging current is $0.5\, A$, the emf of the storage battery is

Current Electricity

Solution:

$V=\varepsilon+i(r)$
$ \Rightarrow 12.5=\varepsilon+\frac{1}{2}(1) $
$\Rightarrow \varepsilon=12 \,V$
(As the battery is a storage battery it is getting charged)