$1 \text{ kWh} = 3.6 \times 10^6 \text{ joules}$. Is this statement true or false?

$A$ $100 \text{ W}$ electric bulb is lighted for $2 \text{ hours}$ daily,and four $40 \text{ W}$ bulbs are lighted for $4 \text{ hours}$ everyday. Calculate the energy consumed (in $\text{kWh}$) in $30 \text{ days}$.

In an electrical circuit,two resistors of $2\,\Omega$ and $4\,\Omega$ respectively are connected in series to a $6\,V$ battery. The heat dissipated by the $4\,\Omega$ resistor in $5\,s$ will be ........ $J$.

Which uses more energy, a $250 \,W$ $TV$ set in $1 \,hr$ or a $1200 \,W$ toaster in $10$ minutes?

$A$ bulb is rated at $5.0 \text{ V}, 100 \text{ mA}$. Calculate its
$(i)$ power and $(ii)$ resistance.

Mention one reason why tungsten is used for making the filament of an electric lamp.