The unit of $e.m.f.$ is

The reading of the ammeter in the adjoining figure will be .............. $A$.

In the circuit shown in the figure, if the ammeter and voltmeter are ideal, then the power consumed in the $9 \, \Omega$ resistor will be .......... $W$.

The readings of the voltmeter and ammeter in the circuit shown in the diagram are respectively

Calculate the potential difference between points $A$ and $B$ and the current flowing in the $10\,\Omega$ resistor in the network shown below.

All wires have the same resistance $r$. The equivalent resistance between $A$ and $B$ is $R$. Now,if the keys $K_1$ and $K_2$ are closed,what will be the new equivalent resistance?