The storage battery of a car has an $emf$ of $12\; V$. If the internal resistance of the battery is $0.4\; \Omega,$ what is the maximum current (in $A$) that can be drawn from the battery?
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$Emf$ of the battery, $E =12\, V$
Internal resistance of the battery, $r=0.4\, \Omega$
Maximum current drawn from the battery $=I$
According to Ohm's law, $E=I r$
$I=\frac{E}{r}$
$=\frac{12}{0.4}=30\, A$
The maximum current drawn from the given battery is $30 \;A$.
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