Two heaters $A$ and $B$ have power rating of $1 \mathrm{~kW}$ and $2 \mathrm{~kW}$, respectively. Those two are first connected in series and then in parallel to a fixed power source. The ratio of power outputs for these two cases is:

If three bulbs $60\,W$, $100\,W$ and $200\,W$ are connected in parallel, then

If power in $3\,\Omega $ is $27\,W$ then what is the power in $2\,\Omega $ ................. $W$

Two bulbs one of $200$ $\mathrm{volts},$ $60$ $\mathrm{watts}$ and the other of $200$ $\mathrm{volts},$ $100$ $\mathrm{watts}$ are connected in series to a $200$ $\mathrm{volt}$ supply. The power consumed will be ................ $\mathrm{watt}$

The internal resistance of a primary cell is $4\, ohm$. It generates a current of $0.2\, amp$ in an external resistance of $21\, ohm$. The rate at which chemical energy is consumed in providing the current is .............. $J/s$

Power $P$ is to be delivered to a device via transmission cables having resistance ${R_C}$. If $V$ is the voltage across $R$ and $I$ the current through it, find the power wasted and how can it be reduced.