Calculate the number of electrons that would flow per second through the cross$-$section of a wire when $1 \,A$ current flows in it.
$A$ hot plate of an electric oven, connected to a $200 \,V$ line. It has two resistance coils $A$ and $B$ each of the $30\, \Omega$ which may be used separately, in series or in parallel. Find the value of the current required in each of the three cases.
Which has a greater resistance$-$a $100$ $W$ bulb or a $60$ $W$ bulb ?
What is the cause of resistance ?
How will you infer with the help of an experiment that the same current flows through every part of the circuit containing three resistances in series connected to a battery?