Question

Define conductance and conductivity.

Or

Define electrical conductivity of a conductor and give its S.I. unit.

Answer 1

Conductance: The reciprocal of resistance is called conductance. It is denoted by G. The unit of conductance is ohm-1 or mho or siemen (S).

G = \(\frac{1}{R}\)

Conductivity. It is a measure of ease with which the current flows through a conductor. R is defined as the reciprocal resistivity. It is denoted by σ.

σ = \(\frac{1}{p}\)

The unit of σ is mho m^-1 or Sm^-1.