Question

Figure represents a part of the closed circuit. If a current of 2A flows in from A, the potential difference between points A and B, $V_A-V_B$ is:

• A. + 9 V
• B. – 9 V
• C. + 3 V
• D. + 6 V

Answer 1

The correct option is A + 9 V

The given part of a closed circuit can be redrawn as follows. It should be remember that product of current and resistance can be treated as an imaginary cell having emf = iR.

Applying KVL in whole terminal of AB;

$V_A-2\left(2\right)-3-2\left(1\right)-V_B=0$

$V_A-V_B=9V$

Hence, + 9 V