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单词 self-induction
释义

self-induction


self-in·duc·tion

(sĕlf′ĭn-dŭk′shən)n. The generation by a changing current of an electromotive force in the same circuit.
self′-in·duc′tive adj.

self-induction

n (General Physics) the production of an electromotive force in a circuit when the magnetic flux linked with the circuit changes as a result of a change in current in the same circuit. See also self-inductance Compare mutual induction ˌself-inˈductive adj

self′-induc′tion



n. the process by which an electromotive force is induced in a circuit by a varying current in that circuit. [1870–75]
Thesaurus
Noun1.self-induction - generation of an electromotive force (EMF) in a circuit by changing the current in that circuit; usually measured in henriesinductance, induction - an electrical phenomenon whereby an electromotive force (EMF) is generated in a closed circuit by a change in the flow of current

Self-Induction


self-induction

[¦self in¦dək·shən] (electromagnetism) The production of a voltage in a circuit by a varying current in that same circuit.

Self-Induction

 

the appearance of an electromotive force (emf) of induction in a conducting circuit when the current in the circuit changes. This phenomenon is a special case of electromagnetic induction. The current change in the circuit causes a change in the magnetic flux through the surface enclosed by the circuit. As a result, an emf—the emf of self-induction—is induced in the circuit. The direction of the emf is determined by Lenz’s law: if the current in the circuit increases, the emf of self-induction opposes this increase; if the current decreases, the emf opposes the decrease. Thus, self-induction is similar to the phenomenon of inertia in mechanics. The emf of self-induction eL is proportional to the rate of change of the current i and to the self-inductance L of the circuit: eL = - Ldi/dt.

Because of self-induction, the closing of an electric circuit containing a constant emf does not instantaneously establish a steady current; the current is established only after a certain time interval (see TRANSIENT). Similarly, when the circuit is opened, the current flow does not cease instantaneously. The emf of self-induction that is induced by the opening of the circuit can be several times greater than the emf of the source. In AC circuits, the emf of self-induction causes the current in an inductance coil to lag in phase behind the voltage across the ends of the coil by (see ALTERNATING CURRENT).

The phenomenon of self-induction plays an important role in electrical engineering and radio engineering. Self-induction causes the recharging of a capacitor connected in series with an inductance coil (see OSCILLATORY CIRCUIT); as a result, natural electromagnetic oscillations are established in the circuit.

REFERENCE

Kalashnikov, S. G. Elektrichestvo. Moscow, 1970. (Obshchii kurs fiziki, vol. 2.)

G. IA. MIAKISHEV

self-induction


Related to self-induction: Coefficient of coupling
  • noun

Words related to self-induction

noun generation of an electromotive force (EMF) in a circuit by changing the current in that circuit

Related Words

  • inductance
  • induction
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