Wikisage, the free encyclopedia of the second generation

Electrical resistivity

From Wikisage
Jump to: navigation, search

Electrical resistivity' (also known as resistivity, specific electrical resistance, or volume resistivity) is an intrinsic property that quantifies how strongly a given material opposes the flow of electric current. A low resistivity indicates a material that readily allows the flow of electric current. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohmmetre (Ω⋅m)[1][2][3] although other units like ohmcentimetre (Ω⋅cm) are also in use. As an example, if a 1 m × 1 m × 1 m solid cube of material has sheet contacts on two opposite faces, and the resistance between these contacts is 1 Ω, then the resistivity of the material is 1 Ω⋅m.


Electrical conductivity or specific conductance is the reciprocal of electrical resistivity, and measures a material's ability to conduct an electric current. It is commonly represented by the Greek letter σ (sigma), but κ (kappa) (especially in electrical engineering) or γ (gamma) are also occasionally used. Its SI unit is siemens per metre (S/m) and CGSE unit is reciprocal second (s−1).
mA2ΩN-1

  1. Lowrie. Fundamentals of Geophysics. Cambridge University Press. pp. 254–. ISBN 978-1-139-46595-3. https://books.google.com/books?id=h2-NjUg4RtEC&pg=PA254. 
  2. Narinder Kumar (2003). Comprehensive Physics XII. Laxmi Publications. pp. 282–. ISBN 978-81-7008-592-8. https://books.google.com/books?id=IryMtwHHngIC&pg=PA282. 
  3. Eric Bogatin (2004). Signal Integrity: Simplified. Prentice Hall Professional. pp. 114–. ISBN 978-0-13-066946-9. https://books.google.com/books?id=_IiONSphoB4C&pg=PA114.