Though the drift velocity of electorn responsible for current in a conductorn under ordinary circumstances is very small, light in a room turn on immediately after the swithc is closed, Explain why and how?

If drift velocity of electron as well as charge on electron is very small, how can we still obtain large amount of current in aconductor?

Since drift velociy of electrons is very small, how then is current established almost the instant a circuit is closed?

Though the electron drift velocity is small and electron charge is very small, a conductor can carry an appreciably large current because

A :The drift velocity of electrons in a conductor is very small still current in a conductor is establised almost instantaneously on closing the switch. R: Electric field in the condutor sets up with speed of light.

A :The drift velocity of electrons in a conductor is very small still current in a conductor is establised almost instantaneously on closing the switch. R: Electric field in the condutor sets up with speed of light.