1.

The drift velocity of electrons in a conducting wire is of the order of 1mm//s, yet the bulb glows very quickly after the switch is put on because

Answer»

The random SPEED of electrons is very high, of the ORDER of 10^6 m/s
The electrons transfer their energy very quickly through collisions 
Electric field is SET up in the WIRE very quickly, producing a current through each cross section, almost intantaneousty 
All of above 

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