Admittance

L' admittance, notée Y, est l'inverse de l'impédance. Elle se mesure en siemens (S).

Elle est définie par :

Y = Z^{-1} = 1/Z  \,

Avec :

L'impédance étant une résistance complexe, et la conductance G étant l'inverse de la résistance, l'admittance est une conductance complexe.

La partie réelle de l'admittance est la conductance, sa partie imaginaire est la susceptance :

Y = G + j B \,

Le module de l'admittance est donné par (comme tous les nombres complexes) :

\left | Y \right | = \sqrt {G^2 + B^2}  \,\!

Avec :

Voir aussi


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Regardez d'autres dictionnaires:

  • admittance — [ admitɑ̃s ] n. f. • 1896; mot angl. , du lat. admittere « admettre » ♦ Phys. Grandeur inverse de l impédance totale d un circuit électrique ou de l impédance équivalente d un conducteur inséré dans un circuit de courant alternatif. L unité d… …   Encyclopédie Universelle

  • Admittance — Ad*mit tance, n. 1. The act of admitting. [1913 Webster] 2. Permission to enter; the power or right of entrance; also, actual entrance; reception. [1913 Webster] To gain admittance into the house. South. [1913 Webster] He desires admittance to… …   The Collaborative International Dictionary of English

  • admittance — admittance, admission. Admittance is mostly confined to the literal sense of allowing one to enter a locality or building {no admittance without a pass} {admittance to the grounds} Admission has acquired the figurative sense of admitting to… …   New Dictionary of Synonyms

  • Admittance — Ad*mit tance, n. (Elec.) The reciprocal of impedance. [Webster 1913 Suppl.] || …   The Collaborative International Dictionary of English

  • admittance — I (acceptance) noun admission, confirmation, designation, entrance, entree, entry, inclusion, induction, initiation, permission II (means of approach) noun access, admission, approach, avenue, course, entrance, entry, entryway, ingress, inlet,… …   Law dictionary

  • admittance — (n.) 1580s, the action of admitting, formed in English from ADMIT (Cf. admit) + ANCE (Cf. ance) (if from Latin, it would have been *admittence; French uses accès in this sense). Used formerly in senses where ADMISSION (Cf. admission) now prevails …   Etymology dictionary

  • admittance — [n] permission to enter access, entrance, entrée, entry, ingress, pass, passage, reception; concepts 388,685 …   New thesaurus

  • admittance — ► NOUN ▪ the process or fact of entering or being allowed to enter …   English terms dictionary

  • admittance — [ad mit′ ns, ədmit′ ns] n. 1. an admitting or being admitted 2. permission or right to enter 3. Elec. the ratio of effective current to effective voltage in a circuit carrying an alternating current; the reciprocal of impedance, measured in… …   English World dictionary

  • Admittance — In electrical engineering, the admittance ( Y ) is the inverse of the impedance ( Z ). The SI unit of admittance is the siemens. Oliver Heaviside coined the term in December 1887. [Ushida et al., Immittance matching for multidimensional open… …   Wikipedia

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