Electrons move at speed of about 1 mm/s. Then how does the light turn on as soon as we switch it on?

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Solution

A situation analogous to this would be a water pipe connected to a water tank. Water flows out the end of the pipe as more water flows into it from the water tank. Similar is the case with electricity. For the bulb to glow, the electrons need not physically move through the complete circuit. Electric current is established as soon as we switch it on, and the bulb glows.

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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.

How is it so that a bulb glows as soon as it's switch on; though the electron drift Wat the speed of 1 or 2 cm/ s

3 \times 10^{8} m / s

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