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Electrical resistivity: Difference between revisions
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''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 alphabet|Greek letter]] ρ ([[Rho (letter)|rho]]). The [[SI]] unit of electrical resistivity is the [[ohm]]⋅[[metre]] (Ω⋅m)<ref>{{cite book|author=Lowrie |title=Fundamentals of Geophysics |url=https://books.google.com/books?id=h2-NjUg4RtEC&pg=PA254 |publisher=Cambridge University Press |isbn=978-1-139-46595-3 |pages=254–}}</ref><ref>{{cite book|author=Narinder Kumar |title=Comprehensive Physics XII |url=https://books.google.com/books?id=IryMtwHHngIC&pg=PA282 |year=2003 |publisher=Laxmi Publications |isbn=978-81-7008-592-8 |pages=282–}}</ref><ref>{{cite book|author=Eric Bogatin |title=Signal Integrity: Simplified |url=https://books.google.com/books?id=_IiONSphoB4C&pg=PA114 |year=2004 |publisher=Prentice Hall Professional |isbn=978-0-13-066946-9 |pages=114–}}</ref> although other units like [[ohm]]⋅[[centimetre]] (Ω⋅cm) are also in use. As an example, if a {{nowrap|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 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 alphabet|Greek letter]] ρ ([[Rho (letter)|rho]]). The [[SI]] unit of electrical resistivity is the [[ohm]]⋅[[metre]] (Ω⋅m)<ref>{{cite book|author=Lowrie |title=Fundamentals of Geophysics |url=https://books.google.com/books?id=h2-NjUg4RtEC&pg=PA254 |publisher=Cambridge University Press |isbn=978-1-139-46595-3 |pages=254–}}</ref><ref>{{cite book|author=Narinder Kumar |title=Comprehensive Physics XII |url=https://books.google.com/books?id=IryMtwHHngIC&pg=PA282 |year=2003 |publisher=Laxmi Publications |isbn=978-81-7008-592-8 |pages=282–}}</ref><ref>{{cite book|author=Eric Bogatin |title=Signal Integrity: Simplified |url=https://books.google.com/books?id=_IiONSphoB4C&pg=PA114 |year=2004 |publisher=Prentice Hall Professional |isbn=978-0-13-066946-9 |pages=114–}}</ref> although other units like [[ohm]]⋅[[centimetre]] (Ω⋅cm) are also in use. As an example, if a {{nowrap|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. | ||
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'''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 (letter)|sigma]]), but κ ([[kappa]]) (especially in electrical engineering) or γ ([[gamma]]) are also occasionally used. Its SI unit is [[Siemens (unit)|siemens]] per [[metre]] (S/m) and [[Electrostatic units|CGSE unit]] is reciprocal [[second]] (s<sup>−1</sup>). | |||
</small>mA<sup>2</sup>Ω''N''<sup>-1</sup> | |||
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[[Category:Electronics]] | |||
Latest revision as of 01:17, 12 March 2016
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 ohm⋅metre (Ω⋅m)[1][2][3] although other units like ohm⋅centimetre (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
- ↑ 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.
- ↑ 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.
- ↑ 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.