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Even though the drift velocity of electrons is very small [1mm/s] an electric bulb lights up as soon as switch is on. Why?



The speed that a signal travels down the wire really has nothing to do with the drift speed of the electrons.
The actual speed of electrons in a metal is quite large, however they go in every direction so the current is zero in the absence of an applied field. 
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Thanks a lot
plz mark as brainliest if it helped you
But my question was, y an electric bulb lights up as soon as switch is on. Ur answer does only says about drift velocity
I'm not so sure...
Electrons are present at every point in an electric circuit. When a potential difference is applied, electric field appears through out the circuit with speed of light. So i think this is the reason why current flows instantly.
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Hope it helped ^_^
Yes. You are correct
Oh!! Thanks a lot
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