$A$ heating coil is labelled $100\, W$,$220\, V$. The coil is cut in half and the two pieces are joined in parallel to the same source. The energy now liberated per second is .............. $J/s$.

$A$ copper wire of radius $0.1 \text{ mm}$ and resistance $2 \text{ k}\Omega$ is connected across a power supply of $40 \text{ V}$. The number of electrons transferred per second between the supply and the wire at one end is

The current in a simple series circuit is $5.0 \, A$. When an additional resistance of $2.0 \, \Omega$ is inserted, the current drops to $4.0 \, A$. The original resistance of the circuit in $\Omega$ was:

When electric bulbs of same power,but different marked voltage are connected in series across the power line,their brightness will be:

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

For the given circuit,the potential difference between $x$ and $y$ is ......... (in $V$)