Question

Figure represents a part of closed circuit. The potential difference $(V_A-V_B)$ is:

• A. $10\text{V}$
• B. $13\text{V}$
• C. $15\text{V}$
• D. $18\text{V}$

Answer 1

The correct option is D $18\text{V}$


Potential difference across resistor is given as $V=IR$.

Potental difference can be calculated as:

$V_A+3-3\left(1\right)-3\left(6\right)=V_B$

$V_A-V_B=18\text{V}$

Tip: When you move in the direction of current, potential across resistor decreases and when you move from negative terminal to positive terminal of the battery, potential increases.