In the following circuit composed of identical resistors,across which terminals would you connect a battery in order to dissipate energy in all resistors?

The equivalent resistance and potential difference between $A$ and $B$ for the circuit shown are respectively:

Twelve wires each having resistance $2 \Omega$ are joined to form a cube. $A$ battery of $6 \text{ V}$ emf is connected across points $a$ and $c$. The voltage difference between $e$ and $f$ is . . . . . . $\text{V}$.

$A$ voltmeter connected across the terminals of a battery reads $5\,V$. When an ammeter is connected across the same terminals,it reads $10\,A$. If a resistor of $2\,\Omega$ is connected across the terminals of this battery,the current flowing through it will be ...........$A$.

In the electrical circuit shown in the figure,the current $i$ through the side $AB$ containing the $20 \; \Omega$ resistor is:

Three light bulbs of $40\, W$,$60\, W$,and $100\, W$ are connected in series with a $220\, V$ source. Which one of the bulbs will glow brightest?