In the given figure, there are two similar cells whose EMFs are same and internal resistances are negligible. These cells are connected in parallel What is the value of current flowing through the resistance $R$?

The currents in some branches are given. The currents in remaining resistance ${\mathit{R}}_1\mathit{ }{\mathit{R}}_2$ and ${\mathit{R}}_3$ are respectively

The figure shows a network of currents. Study the diagram and find the magnitude of current $I$.

Two similar accumulators each of emf $E$ and internal resistance $r$ are connected, as shown in the following figure. The potential difference between $x$ and $y$ is