Question

1Q.Why does a bulb glow immediately irrespective of the connecting wire ,when we switch on?
2Q.why doesn't a bird get shock when it stands on a high voltage wire?

Answer 1

when we switch on any electric circuit, irrespective of the length of the conductor an electric field is set up throughout the conductor instantaneously due to the voltage of the source connected to the circuit. this electric field makes all the electrons to move in a specified direction simultaneously , hence the bulb glows.

Answer 2

Birds do not shocked because of constant voltage if bird will put his one leg on earth and one on wire she will shock because electricity needs a medium to travel to the earth the voltage of earth is 0 and normally voltage of wire is 220 so at same voltage she will not feel current but at different she will