A complex number that gives the relationship between the voltage and current at the terminals of an electric circuit (AC circuit) to which a sinusoidal power source is applied, and is the reciprocal of impedance. Its unit is siemens, and its symbol is S. The voltage and current at the circuit terminals in a steady sinusoidal state have the same frequency as the power source, and only the amplitude and phase change. Therefore, the voltage and current can be expressed in a complex representation called a feather. If such complex representations are V , I , impedance Z , and admittance Y , then Y = 1/ Z = I/ V . In other words, it is the conductance expanded to AC circuits. When the angular frequency of the applied sine wave is ω, the admittance of a capacitor with a capacitance of C is jωC , and the admittance of a coil with a self-inductance of L is 1/ jωL . In the complex representation of the admittance of a circuit, Y = G + jB , the real part G is called the conductance, and the imaginary part B is called the susceptance. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
正弦波電源が加えられた電気回路 (交流回路) の端子における電圧,電流の関係を与える複素数で,インピーダンスの逆数。単位はジーメンスで記号はSである。正弦波定常状態にある回路端子の電圧および電流は電源と同じ周波数となり,振幅と位相のみが変化する。したがって,電圧,電流をフェザーと呼ばれる複素数表示に表わすことができる。そのような複素数表示をそれぞれ,V,I,インピーダンスを Z,アドミタンスを Yとすると,Y=1/Z=I/Vである。すなわち交流回路に拡張されたコンダクタンスである。加えられた正弦波の角周波数がωのとき,静電容量が Cであるコンデンサのアドミタンスは jωC,自己インダクタンスが Lであるコイルのアドミタンスは1/jωLである。回路のアドミタンスの複素数表示 Y=G+jBにおいて実数部 Gはコンダクタンス,虚数部 Bはサセプタンスという。
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