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If the electron drift speed is so small ...

If the electron drift speed is so small and the electron's charge is small, how can we still obtain large amount of current in a conductor?

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Although the drift velocity and charge on electron is very small, but number of electrons per unit volume is very large and electric field is set up in the conductor at the speed of light. As the rate of flow of electrons is very high and hence large current is obtained.
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If drift velocity of electron as well as charge on electron is very small, how can we still obtain large amount of current in aconductor?

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Doping mens introduction of small amount of impurities like phosphorus , arsenic or boron into the pure crystal . In pure silicon , ther are four valenices used in bonding with other four adjacent silicon crystal is doped with a group -15 element ( with five valence electron ) such as P, As , or Bi , the structure of the crystal lattic remains unchanged . Out of the five valence electron of group -15 doped element four element are used in normal covalent bonding with silicon while fiffth electron is delcoasiled and thus conducts electricity Doping a silicon crystal with a group -13 element (with three valence electrons ) such as B, Al, Ga or In products a semiconductor with three electrons in in dopant . The place where fourth electron is missing is called an electron vacancy or hole . Such hole can move throught the crystal like a positive charge giving rise conduction of electricity. No. of valene electrons in silicon are :

Doping mens introduction of small amount of impurities like phosphorus , arsenic or boron into the pure crystal . In pure silicon , ther are four valenices used in bonding with other four adjacent silicon crystal is doped with a group -15 element ( with five valence electron ) such as P, As , or Bi , the structure of the crystal lattic remains unchanged . Out of the five valence electron of group -15 doped element four element are used in normal covalent bonding with silicon while fiffth electron is delcoasiled and thus conducts electricity Doping a silicon crystal with a group -13 element (with three valence electrons ) such as B, Al, Ga or In products a semiconductor with three electrons in in dopant . The place where fourth electron is missing is called an electron vacancy or hole . Such hole can move throught the crystal like a positive charge giving rise conduction of electricity. Silicon that has been dopend with group - 15 elements is called :

Doping mens introduction of small amount of impurities like phosphorus , arsenic or boron into the pure crystal . In pure silicon , ther are four valenices used in bonding with other four adjacent silicon crystal is doped with a group -15 element ( with five valence electron ) such as P, As , or Bi , the structure of the crystal lattic remains unchanged . Out of the five valence electron of group -15 doped element four element are used in normal covalent bonding with silicon while fiffth electron is delcoasiled and thus conducts electricity Doping a silicon crystal with a group -13 element (with three valence electrons ) such as B, Al, Ga or In products a semiconductor with three electrons in in dopant . The place where fourth electron is missing is called an electron vacancy or hole . Such hole can move throught the crystal like a positive charge giving rise conduction of electricity. Silicon that has been dopend with group - 13 elements is called :

When drift velocity is so small, how is it that an electric bulb lights up as soon as we turn the switch on?

BETTER CHOICE PUBLICATION-ELECTRIC CURRENT, RESISTANCE AND E.M.F.-SHORT ANSWER TYPE QUESTIONS
  1. Is a wire carrying current charged?

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  2. What is non-ohmic device? Give one example.

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  3. If the electron drift speed is so small and the electron's charge is s...

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  4. A large number of free electrons are present in metals. Why is there n...

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  5. Standard resistance coils are made of which materials and why ?

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  6. Discuss the effect of temperature on resistivity of metals.

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  7. Why conducting wires are made of copper?

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  8. What is the resistance of a conductor? State the factors on which resi...

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  9. What is the difference between e.m.f. and potential diffrence?

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  10. What are ohmic and non-ohmic resistors? Give one example of each.

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  11. What is e.m.f. of a cell ? On what factors does its value depend ?

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  12. Establish the relation between current and drift velocity?

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  13. Define drift velocity of electricity and establish its relation with v...

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  14. Obtain the condition fo rmaximum current through a resisitor, when a n...

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  15. Define internal resistance of cell and find an expression for it.

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  16. What is internal resistance of a cell? Derive an expression for it.

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  17. What is internal resistance of a cell? Derive an expression for it.

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  18. The internal resistance of a cell is the resistance of

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  19. Derive expression for the total resistance of a circuit in which a few...

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  20. Explain colour code for carbon resistors giving examples.

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