inductancen.
1. 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 usually 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.
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the world > matter > physics > electromagnetic radiation > electricity > electrically induced magnetism > electromagnetic induction > [noun] > inductance
inductance1886
1886 O. 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.
1888 Science July 18 The term commonly employed to denote the electrical inertia-like effect is ‘self-induction’, which is becoming gradually shortened to inductance.
1889 J. 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electromotive force applied to it cannot at once generate in it the full current.., and when the electromotive force is withdrawn time is required for the current strength to fall to zero.
1928 G. E. Sterling & R. S. Kruse Radio Man. 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.
1943 C. 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.
1943 C. L. Boltz Basic Radio v. 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?
1957 Encycl. 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.
1962 D. R. Corson & P. Lorrain Introd. Electromagn. Fields vi. 232 In rationalized m.k.s. units, inductance is measured in webers/ampere, or in henrys.
1962 D. R. Corson & P. Lorrain Introd. Electromagn. Fields vi. 233 We shall now..calculate the self-inductance of a long solenoid..and the mutual inductance between two coaxial solenoids.
1964 J. Goodier & J. W. 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.
2. = inductor n. 3d.
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the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > [noun] > inductance coil
inductance coil1902
inductance1908
variometer1908
honeycomb coil1921
inductor1928
hum-bucking coil1940
1908 J. 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.
1928 G. E. Sterling & R. S. Kruse Radio Man. i. 20 The most commonly employed inductance at radio frequencies consists of a single layer coil wound as an air core solenoid.
1962 D. F. Shaw Introd. Electronics i. 9 The coupling between inductances may reach a value close to unity if they share a ferro-magnetic core.
Compounds
inductance coil n. an inductor (sense 3d) in the form of a loop or coil.
ΘΚΠ
the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > [noun] > inductance coil
inductance coil1902
inductance1908
variometer1908
honeycomb coil1921
inductor1928
hum-bucking coil1940
1902 Encycl. 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.
1906 Westm. Gaz. 4 Jan. 10/1 In the present telephonic cables running to France and Ireland the introduction of inductance coils has improved their capacity by at least 100 per cent.
1913 Wireless World 1 479 The receiver used is the Fleming Valve with necessary tuning condensers and inductances.
1923 E. W. Marchant Radio Telegr. iv. 38 The coherer may, in a simple circuit, be conveniently placed across the inductance coil.
1925 P. J. Risdon Crystal Receivers & Circuits 9 A fixed inductance is one which is not variable, and is employed in circuits where tuning is performed entirely by condensers.
1926 R. W. Hutchinson First Course Wireless 77 The sliding inductance consists of a single layer of enamelled copper wire wound on an insulating tube.
This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2019).
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n.1886