Name: inductors in electric circuits
Uploaded: 2024-04-11T12:48:39.000Z
Duration: 1 min 11 s
Channel: JoVE

K12 Standards

Texas Essential Knowledge and Skills

High School

Chemistry and Physics

IPC.6

IPC.6.A

Inductors

Les inductances, souvent appelées bobines ou bobines, jouent un rôle crucial dans divers systèmes électroniques et d’alimentation.
Essentiellement, tout conducteur à travers lequel un courant alternatif circule possède intrinsèquement des propriétés inductives et pourrait être classé comme une inductance.
Pour renforcer l’effet inductif, des inductances pratiques sont créées en enroulant un fil conducteur autour d’un noyau en matériau magnétique.
Lorsqu’un courant circule à travers une inductance, la tension qui la traverse est directement proportionnelle au taux de variation du courant au cours du temps. Cette constante de proportionnalité est connue sous le nom d’inductance de l’inductance, et elle est mesurée en henry.
L’inductance s’oppose aux changements brusques du courant qui la traverse. Ainsi, le courant traversant une inductance ne peut pas changer instantanément.
Les dimensions physiques, le matériau du noyau et la construction de l’inductance déterminent son inductance.
Les inductances sont disponibles dans une variété de valeurs et de types, allant de quelques microhenrys à des dizaines de henrys.
Ils peuvent être fixes ou variables, avec des noyaux fabriqués à partir d’une variété de matériaux, notamment le fer, l’acier, le plastique ou même l’air.

inductances

Un inducteur est un composant passif construit pour stocker de l'énergie dans son champ magnétique. Il peut être fabriqué en enroulant un fil autour d’un noyau magnétique. Lorsque le courant peut circuler à travers cet inducteur, on observe que la tension aux bornes de l'inducteur est directement proportionnelle au taux de variation temporelle du courant. Mathématiquement, <img alt="Equation1" src="/files/ftp_upload/15088/15088_PT_Equation_1.svg" style="text-align: center; height: 36px;"> Cette relation est exprimée en utilisant la convention du signe passif, où « L » représente la constante de proportionnalité, également connue sous le nom d'inductance de l'inducteur. L'inductance d'un inducteur est influencée par des facteurs tels que sa taille, les matériaux utilisés et la méthode de construction. L'unité de mesure de l'inductance est le Henry (H). L'inductance est une mesure de la capacité d'un appareil à stocker de l'énergie sous forme de champ magnétique. C’est également une caractéristique qui permet à un inducteur de résister aux changements du courant qui le traverse. En plus d'être appelés inducteurs, ces composants peuvent également être appelés bobines ou selfs. Le symbole du circuit d'un inducteur est présenté à la figure 1. <img alt="Figure1" src="/files/ftp_upload/15088/15088_PT_Figure_1.svg" style="text-align: center; height: 150px;"> La figure 2 montre une représentation graphique de la relation entre la tension et le courant pour un inducteur dont l'inductance ne dépend pas du courant, également appelé inducteur linéaire. <img alt="Figure2" src="/files/ftp_upload/15088/15088_PT_Figure_2.svg" style="text-align: center; height: 146px;"> En revanche, un inducteur non linéaire n’aurait pas de tracé en ligne droite, car son inductance fluctue avec le courant. Les inductances, semblables aux condensateurs, sont disponibles dans le commerce en différentes valeurs et types. Dans les applications pratiques, les inductances ont généralement des valeurs d'inductance allant de quelques microhenrys, comme dans les systèmes de communication, à des dizaines de henrys, comme dans les systèmes électriques. Les inducteurs peuvent être fixes ou variables, et leur noyau peut être composé de divers matériaux, notamment le fer, l'acier, le plastique ou même l'air.

Inductances

Les inductances, souvent appelées bobines ou bobines, jouent un rôle crucial dans divers systèmes électroniques et d’alimentation.
En substance, tout conducteur à travers lequel un ...

Education

Enseignement

JoVE Core

Electrical Engineering

Génie électrique

Unit 1

Unité 1

Energy Storage Elements

Éléments de stockage d'énergie

KEY TERMS AND CONCEPTS

TERMES ET CONCEPTS CLÉS

inductors in electric circuits

Inductors are passive components used in electric circuits to store energy in a magnetic field. They are often made by coiling a wire around a magnetic core. This structure gives the component its inductive behavior and its ability to respond to changing current.

When current flows through an inductor, the voltage across it is proportional to how quickly the current changes with time. This relationship is written using the passive sign convention, and the constant of proportionality is called inductance, or L. Inductance is measured in henrys, written as H.

Inductance depends on several factors. The size of the inductor matters, as do the materials used and the way it is built. This property also describes how well the device stores energy in a magnetic field and how strongly it resists changes in current.

Inductors are also called coils or chokes. Their circuit symbol is used in circuit diagrams to show the component clearly. A linear inductor has a straight-line voltage-current graph because its inductance does not depend on current. A nonlinear inductor does not follow a straight line because its inductance changes with current.

Inductors are sold in many values and types, much like capacitors. Their inductance can range from a few microhenrys in communication systems to tens of henrys in power systems. They may be fixed or variable, and their cores can be made from iron, steel, plastic, or even air.

Inductors in Electric Circuits

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inductors

Inductors are passive components used in electric circuits to store energy in a magnetic field. They are often made by coiling a wire around a magnetic core. This structure gives the component its inductive behavior and its ability to respond to changing current. When current flows through an inductor, the voltage across it is proportional to how quickly the current changes with time. This relationship is written using the passive sign convention, and the constant of proportionality is called...

energy stored in inductors

How Inductor Current Stores Magnetic Energy

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series and parallel inductors

Equivalent Inductance in Circuit Networks

Equivalent inductance in circuit networks helps simplify circuits with multiple inductors. When inductors are combined, the circuit can often be replaced by one inductor with the same effect on the current and voltage. For inductors in series, the same current flows through each component. Applying Kirchhoff's voltage law shows that the total voltage is the sum of the inductor voltages. As a result, the equivalent inductance of a series group is the sum of the individual inductances. This is...

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key terms and concepts

Learn how inductors store energy in magnetic fields, resist current changes, and differ as linear or nonlinear components in circuits.

Inductors in Electric Circuits | JoVE K12

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Inductors, often referred to as coils or chokes, play a crucial role in various electronics and power systems.
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Inductors in Electric Circuits

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