Question

A current of $2\text{ampere}$ flows in a system of conductors as shown in the following figure. The potential difference $(V_A-V_B)$ will be (in $\text{volts}$):

• A. $+2$
• B. $+1$
• C. $-1$
• D. $-2$

Answer 1

The correct option is B $+1$

As the equivalent resistances are equal in parallel branches, current will be divided equally.
Now, from the circuit above, we get
$V_A-V_C=iR=1\times 3=3\text{V}....\left(i\right)$
Similarly,
$V_B-V_C=1\times 2=2\text{V}.....\left(ii\right)$

Substracting equation $\left(i\right)$ and $\left(ii\right)$,
$V_A-V_B=3-2=1\text{V}$