A current of $3\,amp$ flows through the $2\,\Omega $ resistor shown in the circuit. The power dissipated in the $5\,\Omega $ resistor is ................. $watt$
A$1$
B$5$
C$4$
D$2$
AIPMT 2008, Medium
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B$5$
b $2\, \Omega, 4\, \Omega$ 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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A potential divider is used to give outputs of $4\,V$ and $8\,V$ from a $12\,V$ source. Which combination of resistances, $(R_1 : R_2 : R_3)$ gives the correct voltages
Refer to the circuit shown. What will be the total power dissipation in the circuit if $P$ is the power dissipated in $R_1$ ? It is given that $R_2=4 R_1$ and $R_3=12 R_1$ are .......... $P$