Question

Question 7. How is it so that a bulb glows as soon as it is switched on; though the electrons drift at a
speed of about 1 or 2 cm/s?​

Answer 1

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$\:\:\:\:\:\:$ Glowing of the bulb is the heating effect of the electric current , So even if the drift velocity is the order of few cm/s , the current flows at the velocity of the propagation of the electric field , Which is the velocity of the light . This is why , when you switch on the bulb we observe that the bulb glows instantly.

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