Find the power of the circuit in $W$.

In the figure shown,battery $1$ has $emf = 6\, V$ and internal resistance $= 1\, \Omega$. Battery $2$ has $emf = 2\, V$ and internal resistance $= 3\, \Omega$. The wires have negligible resistance. What is the potential difference across the terminals of battery $2$ (in $, V$)?

$A$ $50\, W$ bulb is in series with a room heater and the combination is connected across the mains. To get maximum heater output,the $50\, W$ bulb should be replaced by a bulb of: (in $, W$)

In the circuit shown,$A$ and $V$ are an ideal ammeter and an ideal voltmeter respectively. The reading of the voltmeter will be ............... $V$.

What is the equivalent resistance between $A$ and $B$ in the figure below if $R = 3\,\Omega$?

In the circuit diagram shown below,the magnitude and direction of the flow of current respectively would be