In the network shown in Fig, calculate the current of the $6 \mathrm{V}$ battery.

 

In the network shown in Fig, determine the potential difference between the points $A$ and $B$.

Calculate the potential difference between the junctions $B$ and $D$ in the Wheatstone’s bridge shown in Fig.

In the given electrical networks shown in Figs. (a) and (b), identical cells each of emf $\xi$, are giving same current $I$. Find the values of the resistors $R_1$ and $R_2$ in the network (b).

What does the ammeter $A$ read in the circuit shown in Fig.? What if the positions of the cell and the ammeter are interchanged?

In the circuit shown in Fig, determine the current in the resistance $CD$ and equivalent resistance between the points $A$ and $B$. The internal resistance of cell is negligible.