In the given figure,the value of $V_{0}$ will be $.....V$.

If the Wheatstone bridge with four resistors $R_1, R_2, R_3$ and $R_4$ is balanced,then the correct expression is

$A$ Wheatstone's bridge is balanced with a resistance of $625\, \Omega$ in the third arm,where $P, Q$ and $S$ are in the $1^{st}, 2^{nd}$ and $4^{th}$ arm respectively. If $P$ and $Q$ are interchanged,the resistance in the third arm has to be increased by $51\,\Omega$ to secure balance. The unknown resistance in the fourth arm is ............. $\Omega$.

The figure shows a network of five resistances and two batteries. The current through the $30\,V$ battery is ............... $A$.

The readings of ammeters $A_1, A_2$ and $A_3$ will be respectively:

Find the value of the current through the $2\,\Omega$ resistance for the given circuit. (in $,A$)