As the switch $S$ is closed in the circuit shown in the figure,the current passing through it is ............. (in $, A$)

In the arrangement shown in the figure,the current through the $5\,\Omega$ resistor is ............. $A$.

Three resistances $P, Q, R$ each of $2 \,\Omega$ and an unknown resistance $S$ form the four arms of a Wheatstone bridge circuit. When a resistance of $6 \,\Omega$ is connected in parallel to $S$,the bridge gets balanced. What is the value of $S$ in $\Omega$?

As shown in the circuit diagram,find the value of $I = \text{ . . . . . . }$. (in $\text{ A}$)

In the electrical circuit shown in the figure,the current through the $4 \Omega$ resistor is: (in $A$)

Four resistors $A, B, C$ and $D$ form a Wheatstone bridge. The bridge is balanced when $C = 100 \ \Omega$. If $A$ and $B$ are interchanged,the bridge balances for $C = 121 \ \Omega$. The value of $D$ is: (in $Omega$)