If n ,e,m and `tau` are free electron density in conductor , charge of electron, mass of electron and relaxation time of free electrons , then resistivity `rho` of the conductor can be expressed as

If n,e,A and v_(d) are free electron density inside conductor , charge of electron , area of cross-section of conductor and drift velocity of free electrons inside conductor, then current l through the conductor is

If n,e,A and v_(d) are free electron density inside conductor , charge of electron , area of cross-section of conductor and drift velocity of free electrons inside conductor, then current l through the conductor is

If the free electron density be n and relaxation time be tau , the electrical conductivity of a conductor may be expressed as

Define drift velocity and relaxation time, with reference to the free electron theory of conductors.

Mobility of free electrons in a conductor is

Mobility of free electrons in a conductor is

Mobility of free electrons in a conductor is