Find the potential difference $(V_A - V_B)$ for the given circuit.

In the following network, the current flowing through $15 \text{ } \Omega$ resistance is (in $\text{ A}$)

The figure shows a network of five resistances and two batteries. The current through the $30\,V$ battery is ............... $A$.

$A$ $16\, \Omega$ wire is bent to form a square loop. $A$ $9\, V$ supply having an internal resistance of $1\, \Omega$ is connected across one of its sides. The potential drop across the diagonals of the square loop is $.......\, \times 10^{-1}\, V$.

In the balanced condition,the values of the resistances of the four arms of a Wheatstone bridge are shown in the figure below. The resistance $R_3$ has a temperature coefficient of $0.0004 \ {}^{\circ}C^{-1}$. If the temperature of $R_3$ is increased by $100 \ {}^{\circ}C$,the voltage developed between $S$ and $T$ will be. . . . . . . volt.

The value of current through the $20\,\Omega$ resistor is .................. $A$.