Question

Calculate total resistance, total current and p.d across 7$\Omega$ resistor.

Answer 1

Let the applied emf be $V_1$.

Equivalent resistance of the circuit,

$R=7\Omega +\frac{\left(5\Omega \right)\left(10\Omega \right)}{(5+10)\Omega }$

$=7+\frac{50}{15}=10.33\Omega$

Total current, $I=\frac{V_1}{R}=\frac{V_1}{0.33}A$

$\therefore$ Potential difference across $7\Omega$ resistors.

$V^{\prime }=\left(I\right)\left(7\Omega \right)$

$\frac{V}{10.33}\times 7=0.68V_1$