Mean drift velocity

Question 1

What is number density?

Answer 1

Number of free charge carriers per unit volume. The higher the number density, the greater the number of free electrons per unit volume and so the better electrical conductor.

Question 2

What is a semiconductor?

Answer 2

A semiconductor is a material that has electrical conductivity between that of a conductor (like copper) and an insulator (like rubber). This conductivity can be controlled, making semiconductors essential in electronic devices.

Question 3

Definition of mean drift velocity?

Answer 3

The mean drift velocity is the average velocity of charged particles (typically electrons) in a conductor, such as a metal, due to an applied electric field.

Question 4

Equation including mean drift velocty?

Answer 4

I = naev

I = current
n = number density
e = elementary charge
v = drift velocity