Three resistance of $15 \mathrm{\Omega }$ each are connected in delta. The resistance of equivalent star will have a value of

Five equal resistances are connected in a network as shown in figure. The net resistance between the points $A$ and $B$ is :

The four arms of a Wheatstone bridge have resistances as shown in the figure. A galvanometer of $15\Omega$ resistance is connected across BD. Calculate the current through the galvanometer when a potential difference of $10 \mathrm{V}$ is maintained across AC.

In the given circuit, the current through $2 \mathrm{\Omega }$ resistor is

Two lamps, one rated $100 \mathrm{W}$ at $220 \mathrm{V}$, and the other $60 \mathrm{W}$ at $220 \mathrm{V}$, are connected in parallel to the electric mains supply. What current is drawn from the line if the supply voltage is $220 \mathrm{V}$?

The current in the $1 \mathrm{\Omega }$ resistor shown in the circuit is,

Six similar bulbs are connected as shown in the figure with a DC source of emf $E$, and zero internal resistance.
The ratio of power consumption by the bulbs when $\left(\mathrm{i}\right)$ all are glowing and $\left(\mathrm{ii}\right)$ in the situation when two from section $A$ and one from section $B$ are glowing will be,