Question

A current of $3$ $A$ flows through the $2$ $\Omega$ resistor shown in the circuit. The power dissipated in the $5$ $\Omega$ resistor is

• A. $4$ $W$
• B. $2$ $W$
• C. $1$ $W$
• D. $5$ $W$

Answer 1

The correct option is D $5$ $W$

Potential diffrence about 2 ohm,$V=I\times R$

$=3\times 2=6V$

Current in in 5 ohm$i=\frac{V}{R_{e}q}=\frac{6}{5+1}$

$\Rightarrow$ current in $5\Omega$ resistor $1A$

power discipated

$P=i^{2}R$

$P=1^2\times 5=5w$