Three resistors are joined to form a triangle $\mathrm{ABC}$. The resistance of the sides$AB, BC$ and$CA$ are $40 \mathrm{\Omega }, 60 \mathrm{\Omega }$ and $100 \mathrm{\Omega }$ respectively. Find the equivalent resistance between points $A$ and $B$.

The diagram above shows a circuit with the key k open.

 Calculate the resistance of the circuit when the key k is closed.

 Calculate the current drawn from the cell when the key k is closed.

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

The equivalent resistance between $A$ and $B$ for the mesh shown in the figure is

Thirteen resistors each of resistance $R$ are connected in the circuit as shown in the following figure. Net resistance between $A$ and $B$ 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, 

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

Each resistance in the given cubical network has resistance of $1\mathrm{\Omega }$ and equivalent resistance between $A$ and $B$ is

A dc source with internal resistance $R_0$ is connected to three identical resistors each of resistance $R$ as shown in the figure. If the thermal power generated in the circuit is highest, then

$A$ and $B$ are two points on a uniform ring of resistance $19 \mathrm{\Omega }.$ The angle $\angle AOB=45°$. The equivalent resistance between $\mathrm{A}$ and $\mathrm{B}$ is