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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 admittance ： ウィキペディア英語版 admittance In electrical engineering, admittance is a measure of how easily a circuit or device will allow a current to flow. It is defined as the inverse of impedance. The SI unit of admittance is the siemens (symbol S). Oliver Heaviside coined the term ''admittance'' in December 1887. Admittance is defined as :$Y\; \backslash equiv\; \backslash frac\; \backslash ,$ where :''Y'' is the admittance, measured in siemens :''Z'' is the impedance, measured in ohms The synonymous unit mho, and the symbol ℧ (an upside-down uppercase omega Ω), are also in common use. Resistance is a measure of the opposition of a circuit to the flow of a steady current, while impedance takes into account not only the resistance but also dynamic effects (known as reactance). Likewise, admittance is not only a measure of the ease with which a steady current can flow, but also the dynamic effects of the material's susceptance to polarization: :$Y\; =\; G\; +\; j\; B\; \backslash ,$ where *$Y$ is the admittance, measured in siemens. *$G$ is the conductance, measured in siemens. *$B$ is the susceptance, measured in siemens. *$j^2\; =\; -1$ ==Conversion from impedance to admittance== The impedance, Z, is composed of real and imaginary parts, :$Z\; =\; R\; +\; jX\; \backslash ,$ where *''R'' is the resistance, measured in ohms *''X'' is the reactance, measured in ohms :$Y\; =\; Z^=\; \backslash frac\; =\; \backslash left(\; \backslash frac\; \backslash right)\; \backslash left(R\; -\; jX\backslash right)$ Admittance, just like impedance, is a complex number, made up of a real part (the conductance, ''G''), and an imaginary part (the susceptance, ''B''), thus: :$Y\; =\; G\; +\; jB\; \backslash ,\backslash !$ where ''G'' (conductance) and ''B'' (susceptance) are given by: :$\backslash begin$ G &= \Re(Y) = \frac \\ B &= \Im(Y) = -\frac \end The magnitude and phase of the admittance are given by: :$\backslash begin$ \left | Y \right | &= \sqrt = \frac \right) = \arctan \left( -\frac \right) \end where *''G'' is the conductance, measured in siemens *''B'' is the susceptance, also measured in siemens Note that (as shown above) the signs of reactances become reversed in the admittance domain; i.e. capacitive susceptance is positive and inductive susceptance is negative. 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「admittance」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.