$A$ heater draws a current of $2\,A$ when connected to a $250\,V$ source. The rate of energy dissipation is ............. $W$.

Electric power is transmitted over long distances through conducting wires at high voltage because

Which device can convert all electrical energy into heat?

There are $n$ number of identical electric bulbs,each designed to draw a power $P$ independently from the mains supply. If they are now joined in series across the same mains supply,what is the total power drawn by the combination?

$A$ constant current $i$ is passed through a resistor. Taking the temperature coefficient of resistance into account,indicate which of the plots shown in the figure best represents the rate of production of thermal energy in the resistor.

An electric bulb is rated $60\,W$,$220\,V$. The resistance of its filament is ............. $\Omega$.