| 单词 | q factor |
| 释义 | > as lemmasQ factor 11. Electronics and Physics. The ratio of the reactance of an inductor or capacitor to its electrical resistance. More widely: a parameter of an oscillatory system or device representing the degree to which it is undamped, and hence expressing the relationship between stored energy and energy dissipation. Also Q factor.In the wider use often defined as equal to 2π times the ratio of the mean total energy of the system to the energy that must be supplied each cycle to sustain the oscillations. Q-meter n. an instrument for measuring the Q of a component. [On the origin of this use see B. Jeffreys A footnote to ‘a Q-rious tale’ in Q. Jrnl. Royal Astron. Soc. (1986) 27 693] . ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > resistance > [noun] > reactance > ratio quality factor1899 Q1925 the world > matter > physics > electromagnetic radiation > electricity > resistance > [noun] > reactance > ratio > instrument measuring Q-meter1943 1925 K. S. Johnson Transmission Circuits for Teleph. Communication App. 314 Q... Coil dissipation constant, or the ratio of the reactance of a coil to its effective resistance. 1938 Admiralty Handbk. Wireless Telegr. II. §F 19 Good coils often have a Q of the order of 100. 1943 F. E. Terman Radio Engineers' Handbk. xiii. 916 Q meters are frequently used to measure reactance and resistance (or conductance) of choke coils, dielectrics, etc. 1965 Wireless World July 338/1 A technique..which had resulted in inductors with good Q factors of 50 to 80. 1975 D. G. Fink Electronics Engineers' Handbk. xi. 13 By lowering the Q of the optical cavity, the laser cannot oscillate. 1991 G. H. Tomlinson Electr. Networks & Filters 26 The condition Q = 0.5 is the critically damped condition and the response is seen to be non-oscillatory. < as lemmas |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。