How much heat (in $cal$) is produced when a $210 \, W$ bulb is kept on for $5 \, min$? (Given $J = 4.2 \, J/cal$)

On giving $220\,V$ to a resistor,the power dissipated is $40\,W$. The value of the resistance is ............... $\Omega$.

Which of the following plots may represent the thermal energy produced in a resistor in a given time as a function of the electric current?

The power rating of an electric motor which draws a current of $3.75\, A$ when operated at $200\, V$ is about:

Two electric lamps of $40\, W$ each are connected in parallel. The power consumed by the combination will be ........... $W$.

Heating coils rated at $220\, V$ are available with resistances of $55\,\Omega$,$110\,\Omega$,$220\,\Omega$,and $440\,\Omega$. Which resistance value will produce the maximum power?