A current of $3\,amp$ flows through the $2\,\Omega $ resistor shown in the circuit. The power dissipated in the $5\,\Omega $ resistor is ................. $watt$
AIPMT 2008, Medium
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$2\, \Omega, 4\, \Omega$ and $(1\, \Omega+5\, \Omega)$ are in parallel so their potential difference are the same.
$V=3 \times 2=6 \mathrm{\,V}$
$\mathrm{i}_{3}=\frac{6}{1+5}=1 \mathrm{\,A}$
$P_{S}=i_{3}^{2} \times 5=(1)^{2} \times 5=5 \,W$
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