| 释义 |
inˈductance
[f. prec. (sense 6) + -ance.]
1. a. That property of a circuit or device by virtue of which any variation in the current flowing through it induces an e.m.f. in the circuit itself (self-inductance) or in another conductor (mutual inductance): without qualification usu. the former. Also, the magnitude of this, as measured by the ratio of an induced e.m.f. to the rate of change of the inducing current.
1886O. Heaviside in Electrician 12 Feb. 271 Conductivity and conductance are mathematically related in the same manner (except as regards 4π) as inductivity and what it is naturally suggested to call Inductance. The Inductance of a circuit is what is now called its coefficient of self-induction... When the mutual coefficient of induction of two circuits is to be referred to, it will of course be the mutual inductance. 1888Science July 18 The term commonly employed to denote the electrical inertia-like effect is ‘self-induction’, which is becoming gradually shortened to inductance. 1889J. A. Fleming Alternate Current Transformer I. ii. 42 The..inductance of a circuit is, speaking generally, a quality of it in virtue of which a finite and steady electromotive force applied to it cannot at once generate in it the full current.., and when the electromotive force is withdrawn time is required for the current strength to fall to zero. 1928Sterling & Kruse Radio Manual i. 20 The inductance of a circuit conductor, coil or of any apparatus is a property of that thing just as resistance is one of its properties. 1943C. L. Boltz Basic Radio v. 88 In most radio work the only inductance anywhere worth considering is certainly that in coils. Nevertheless we must not forget that any conductor whatever has some inductance. Ibid. 90 Two coils have inductances of 2H and 4H. If they are coupled together so that only 50 per cent. of the flux is linked with all the turns, what is the value of the mutual inductance? 1957Encycl. Brit. VIII. 293/2 When direct current is used, the inductance has no effect while the current is steady, but it delays the establishment of current when the circuit is first completed. 1962Corson & Lorrain Introd. Electromagn. Fields vi. 232 In rationalized m.k.s. units, inductance is measured in webers/ampere, or in henrys. Ibid. 233 We shall now..calculate the self-inductance of a long solenoid..and the mutual inductance between two coaxial solenoids. 1964Goodier & Meynell Electr. iv. 49 A circuit will have an inductance of 1 henry if a current in it changing at the rate of 1 ampere per second induces an e.m.f. of 1 volt.
b. = inductor 3 d.
1908J. A. Fleming Elem. Man. Radiotelegr. ii. 66 One form which the inductance may take is that of a loop of one or a few turns of insulated wire. 1928Sterling & Kruse Radio Manual i. 20 The most commonly employed inductance at radio frequencies consists of a single layer coil wound as an air core solenoid. 1962D. F. Shaw Introd. Electronics i. 9 The coupling between inductances may reach a value close to unity if they share a ferro-magnetic core.
2. Special Comb.: inductance coil, an inductor (sense 3 d) in the form of a loop or coil.
1902Encycl. Brit. XXXIII. 232/1 The Slaby-Arco arrangement consists at the transmitting end of an *inductance coil elevated above the ground; one end of this coil is connected to the earth..and the other end to a condenser, the opposite terminal of which is connected to one secondary terminal of an induction coil. 1923E. W. Marchant Radio Telegr. iv. 38 The coherer may, in a simple circuit, be conveniently placed across the inductance coil. |