Question

Calculate the potential difference between points $a$ and $b$ in the circuit below, i.e.,$|V_{ab}|$

• A. $2V$
• B. $4V$
• C. $6V$
• D. $8V$

Answer 1

The correct option is B $4V$



Using kirchoffs loop rule for the closed loop,
$+12-2I-4I=0\Rightarrow I=2A$

Using kirchoffs voltage law between $a$ and $b$,
$\Rightarrow V_b-V_a=4-2\left(4\right)-0\left(10\right)=-4V$
Therefore $|△V_{ab}|=4V$