In the given circuit,if the value of each resistor is $10\, \Omega$,then the current flowing through $AD$ will be:

In the circuit shown in the figure,the potential difference between points $A$ and $B$ is........

The ammeter $A$ reads $2\, A$ and the voltmeter $V$ reads $20\, V$. The value of resistance $R$ is (Assuming finite resistances of ammeter and voltmeter).

The potential difference between the points $P$ and $Q$ in the electric circuit shown is ................. $V$.

Three resistors $1 \Omega, 2 \Omega$ and $3 \Omega$ are connected to form a triangle. Across the $3 \Omega$ resistor,a $3 \text{ V}$ battery is connected. The current through the $3 \Omega$ resistor is: (in $\text{ A}$)

When a battery sends an electric current through a resistor $R_1$ for time $t$,the heat produced in the resistor is $Q$. When the same battery sends an electric current through a resistor $R_2$ for the same time $t$,the heat produced in the resistor $R_2$ is also $Q$. Determine the internal resistance $r$ of the battery.