Question

The potential difference $(V_A-V_B)$ between the points $A$ and $B$ in the given figure is:

• A. $+9\text{V}$
• B. $-3\text{V}$
• C. $+3\text{V}$
• D. $+6\text{V}$

Answer 1

The correct option is A $+9\text{V}$

Given: $I=2\text{A}$
Using Kirchoff's voltage law,
$V_A-I\left(2\right)-3-I\left(1\right)=V_B$
$\Rightarrow V_A-(2\times 2)-3-(2\times 1)=V_B$
$\Rightarrow V_A-V_B=9\text{V}$