Electrical conductance o The inverse of resistance is known as conductance.
o In the equation the constant of proportionality denoted by called rho is called resistivity.
o It is measured in units called ohm metre. o When length = 1m. Cross sectional area = 1m 2 o Then resistivity becomes the resistance. 1 Ω m = 100 Ω cm 1 Ω cm = 0.01 Ω m
Electrical conductance o The inverse of resistance is known as conductance.
o It is measured in a unit called Siemens represented by the symbol‘ S’
o It is equal to ohm – 1 also known as mho or Ω – 1.
o The electrical conductance depends on: Nature and structure of the metal 2. Number of valence electrons per atom 3. Electrical conductance decreases with increase of temperature and vice versa.