2. Once it has been established that the average drift speed of an electron is very, very slow, the question soon arises: Why does the light in a room or in a flashlight turn on immediately after the switched is turned on? Wouldn't there be a noticeable time delay before a charge carrier moves from the switch to the light bulb filament?

Explanation:

Current in a wire travels with a speed almost equal to speed of light . It is so because , when electron moves forward , it interacts with neighboring electrons . Due to this interaction , electric field gets disturbed . This flip or disturbance travels at a speed almost equal to speed of light. At the target it interacts with electron at the target. All through its path, it influences all the electrons on its path . We all know that electromagnetic wave consists of electric field which can influence electrons.

So current travels at speed of light.

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