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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Electrical resistivity and conductivity ： ウィキペディア英語版 Electrical resistivity and conductivity 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) although other units like ohm⋅centimetre (Ω⋅cm) are also in use. As an example, if a 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). Another related quantity, widely used in the literature of plasma physics, is the magnetic diffusivity defined as $\backslash eta=\backslash rho/\backslash mu\_0\backslash equiv\; 1/\backslash sigma\; \backslash mu\_0$ where $\backslash mu\_0$ is the magnetic permeability. The unit of the magnetic diffusivity, in SI, is $mA^2\; \backslash Omega\; N^$. == Definition == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Electrical resistivity and conductivity」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.