$EMF$ is most closely related to

In the following circuit, the current through $6 \Omega$ resistor is

$A$ total of $100$ cells,each having an $emf$ of $5\,V$ and an internal resistance of $1\,\Omega$,are connected to an external resistance of $25\,\Omega$ to obtain the maximum current. If each row contains an equal number of cells,what should be the number of rows?

An energy source will supply a constant current into the load if its internal resistance is

Write the equation for the equivalent electromotive force (emf) of cells connected in parallel.

In the given diagram,an ideal voltmeter $V$ reads $1.45\,V$. Then the relation between $r_1$ and $r_2$ is: