Question

In the given circuit, calculate the potential difference between the points $P$ and $Q$

Answer 1

Net resistance, $R=1+9+2=12\Omega$

Net voltage $V=12-8=4V$

$\Rightarrow I=\frac{V}{R}$ $\Rightarrow I=\frac{4}{12}=\frac{1}{3}$

$\therefore V_P+\frac{1}{3}\times 1+8-12+\frac{1}{3}\times 2=V_Q$

$\Rightarrow V_P-V_Q=3V$