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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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
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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
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