Question

How is it then that an electric bulb lights up as soon as we turn the switch on?

Answer 1

This is what happens in your electrical circuit. When you close the switch electrons flow into the wire where they bump into the electrons already in the wire and push them along. That's how the electrons in the bulb filament start moving within a few nanoseconds of you closing the switch .

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Answer 2

Answer:

It cannot be that a current starts only when an electron from one terminal of the electric supply physically reaches the other terminal, because the physical drift of electrons in the conducting wire is a very slow process. The exact mechanism of the current flow , which takes place with a speed close to the speed of light

Explanation:

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