Question

In the figure, current through the $3\Omega$ resistor is $0.8$ ampere, the potential drop through $4\Omega$ resistor is

• A. $9.6V$
• B. $2.6V$
• C. $4.8V$
• D. $1.2V$

Answer 1

The correct option is C $4.8V$

Let current passing through the circuit is $I$ and through resistor $6\Omega$ is $I_1$ and potential drop through resistor $4\Omega$ is $V$

Potential drop across resistor $3\Omega$ and $6\Omega$ is same.

$\Rightarrow$ Using $V=IR$, $\Rightarrow 0.8\times 3=I_1\times 6$ $\Rightarrow I_1=0.4A$

$\therefore I=I_1+0.8=1.2A$

$\Rightarrow$ Potential drop through resistor $4\Omega$, $V=1.2\times 4=4.8V$