| 释义 |
henry3 Physics.|ˈhɛnrɪ|
The name of Joseph Henry (1797–1878), American physicist, used (pl. henrys, henries) to designate the practical unit of inductance, now incorporated in the International System of Units, i.e. the inductance of a circuit in which an electromotive force of one volt is produced by a current changing at the rate of one ampere per second. Abbrev. H or (rare) h. Also ˈhenrymeter (see quot. 1940).
1893Electrician 29 Sept. 577/2 There was the proposal [at the International Electrical Congress] to christen the unit of self-induction as the henry in honour of Joseph Henry its discoverer. 1915Proc. IRE III. 223 The transformer is made up of coils having an inductance of the order of a henry or more. 1929K. Henney Princ. Radio iv. 62 The coils used in radio apparatus vary from inductances of the order of microhenries to very large ones having over 100 henries in inductance. 1940Chambers's Techn. Dict. 411/1 Henrymeter, an obsolete apparatus for measuring inductance; in it an alternating current was passed through the inductance under test and a standard inductance in series, the voltage drop across the two being compared. 1947Jrnl. Inst. Electr. Engin. XCIV. 342/1 From the 1st January the units employed [at the National Physical Laboratory] will be those derived from the centimetre, gramme and second, i.e. the so-called ‘absolute’ units. The effects of this change may be seen from the following table:..One international henry = 1·00049 ‘absolute’ henrys. 1952Electronic Engin. XXIV. 465 A 10 henry A.F. choke has been provided in the cathode circuit. |