☝The electrical resistance of any object is directly proportional to its length, l, and inversely proportional to its area of cross section, A. That is,
R =ρl/A.
☝The inverse of resistance is called conductance, G.
G = l/R = A/lρ =k A/l.
☝The SI unit of conductance is siemen, represented by ‘S’ or Ω-1.
☝The inverse of resistivity is called conductivity (specific conductance) κ.
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