$A$ battery of $e.m.f.$ $2\,V$ and internal resistance $0.1\, \Omega$ is being charged by a current of $5\,A$. The potential difference across the terminals of the battery is ......... $V$.

What is a parallel connection of cells? Obtain the equation for the equivalent emf of two cells connected in parallel.

Two identical cells each of emf $1.5 \,V$ are connected in parallel across an external resistance formed by two $20 \,\Omega$ resistors connected in parallel. $A$ voltmeter connected in the circuit measures $1.2 \,V$. The internal resistance of each cell is ................. $\Omega$.

The current provided by a battery is maximum when:

The $e.m.f.$ of a lead-acid car battery is $12 \, V$. The internal resistance of the battery is $0.5 \, \Omega$. The maximum current that can be drawn from the battery is ............. $A$.

Four identical cells,each having an electromotive force $(e.m.f.)$ of $12\,V$,are connected in parallel. The resultant electromotive force $(e.m.f.)$ of the combination is .............. $V$.