For an open circuit condition,what is the value of the terminal voltage of a cell?

When an external resistance of $5\text{ }\Omega$ is connected across the terminals of a cell, a current of $0.25\text{ A}$ flows through it. When the $5\text{ }\Omega$ resistor is replaced by a $2\text{ }\Omega$ resistor, a current of $0.5\text{ A}$ flows through it. The internal resistance of the cell is . . . . . . $\Omega$.

Consider a parallel combination of the cells shown in the figure. The potential difference between $B_1$ and $B_2$ is

Explain the 'Mixed Connection' of cells and derive an expression for its equivalent emf and current.

The combination of two identical cells,whether connected in series or parallel combination,provides the same current through an external resistance of $2 \,\Omega$. The value of internal resistance of each cell is ............ $\Omega$.

$A$ current of $2\,A$ is flowing through a cell of $e.m.f.$ $5\,V$ and internal resistance $0.5\,\Omega$ from negative to positive electrode. If the potential of the negative electrode is $10\,V$,the potential of the positive electrode will be .............. $V$.