If the readings of the ammeter and voltmeter are $2 \, A$ and $120 \, V$ respectively,what is the resistance of the voltmeter in $\Omega$?

In how much time will one litre of ${H_2}$ be collected by a $5\, A$ current? (Given: $Z = 1 \times {10^{ - 8}}\,kg/C$ and density of ${H_2} = 0.09\,kg/{m^3}$)

In the given circuit, the current through the $2 \Omega$ resistor is: (in $\text{ A}$)

Two wires made of the same material have lengths in the ratio $2: 3$ and radii in the ratio $8: 9$. If the same potential difference is applied across the ends of the wires,the ratio of the electric currents flowing through them is

In the given circuit,the power generated in the $1 \, \Omega$ resistance will be maximum for $x$ equal to ................ $\Omega$.

Consider the circuit shown in the figure. Find the current through the $10\,\Omega$ resistor when the switch $S$ is $(a)$ open $(b)$ closed.