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Electrons are responsible for conduction in a conductor. The speed of electron is not very high. Then, how the bulb is on immediately even though the

switch & bulb are far away from each other in a household circuit ?


A calculation shows that the electron is traveling at about 2,200 kilometers per second. That's less than 1% of the speed of light, but it's fast enough to get it around the Earth in just over 18 seconds. Read up on what happens when nothing can go faster than the speed of light.
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The large electronic number density is what keeps a good amount of current flowing through and is instantaneous.
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