Find the current through the $2\, \Omega$ resistance. (in $, A$)

In the following circuit,the $5 \, \Omega$ resistor develops $45 \, J/s$ due to the current flowing through it. The power developed per second across the $12 \, \Omega$ resistor is ............. $W$.

The effective resistance between points $P$ and $Q$ of the electrical circuit shown in the figure is

$A$ straight wire of resistance $R$ is bent into the shape of a square. $A$ cell of emf $12 \text{ V}$ is connected between two adjacent corners of the square. The potential difference across any diagonal of the square is (in $\text{ V}$)

$A$ current of $6 \ A$ enters one corner $P$ of an equilateral triangle $PQR$ having three wires of resistance $2 \ \Omega$ each and leaves by the corner $R$ as shown in the figure. Then the currents $I_1$ and $I_2$ are respectively:

Four bulbs $B_1, B_2, B_3$ and $B_4$ of $100\, W$ each are connected to a $220\, V$ main supply as shown in the figure. The reading in an ideal ammeter will be ............... $A$.