Name: norton current in ac circuit analysis
Uploaded: 2024-04-11T12:48:50.000Z
Duration: 1 min 16 s
Channel: JoVE

Le théorème de Norton stipule que tout réseau linéaire à deux bornes peut être remplacé par un circuit équivalent composé d'une source de courant constant en parallèle avec une impédance.
Pour déterminer la valeur de l’impédance parallèle, la source est remplacée par son impédance interne. L'impédance équivalente de ce circuit résultant est l'impédance de Norton, qui est la même que l'impédance de Thévenin.
Pour déterminer le courant de Norton, replacez les sources dans le circuit, et analysez la tension en circuit ouvert, qui est la tension de Thévenin.
La tension de Thévenin est déterminée par le produit du courant source et de l’impédance de Thevenin.
La même tension est abaissée aux bornes de l’impédance de charge lorsqu’elle est placée dans une configuration parallèle.
Rappelons la relation entre le courant de Norton, la tension de Thévenin et l’impédance de Thévenin. En substituant les valeurs, il permet de déterminer le courant de Norton.
Le théorème de Norton est bénéfique pour l'analyse et la conception de systèmes contenant des circuits AC complexes.
En déterminant le circuit équivalent Norton pour chaque étage ou section du circuit complexe, l’analyse de l’ensemble du système peut être simplifiée.

circuits équivalents norton

Le théorème de Norton est un concept fondamental dans le domaine de l'électrotechnique qui permet de simplifier des circuits alternatifs complexes. Le théorème stipule que tout réseau linéaire à deux bornes peut être remplacé par un circuit équivalent constitué d'une impédance parallèle à une source de courant constant. La figure 1 montre le circuit CA divisé en deux parties : le circuit A et le circuit B, tandis que la figure 2 représente le circuit obtenu en remplaçant le circuit A par son circuit équivalent Norton. <img alt="Figure1" src="/files/ftp_upload/15114/15114_PT_Figure_1.svg" style="text-align: center; height: 160px;"> Figure 1 : Un circuit divisé en deux parties <img alt="Figure2" src="/files/ftp_upload/15114/15114_PT_Figure_2.svg" style="text-align: center; height: 160px;"> Figure 2 : Circuit équivalent Norton Pour calculer la valeur de l'impédance parallèle, il faut remplacer la source par son impédance interne, ce qui donne un circuit avec une impédance équivalente connue sous le nom d'impédance Norton. L'impédance Norton est la même que l'impédance Thévenin et est utilisée pour déterminer le courant Norton, qui est le courant circulant dans le circuit. La détermination du courant Norton nécessite de remettre les sources dans le circuit et d'analyser la tension en circuit ouvert, également appelée tension de Thévenin. La valeur de la tension Thévenin est déterminée en multipliant le courant source par l'impédance Thévenin et est utilisée pour faire chuter la même tension aux bornes de l'impédance de charge lorsqu'elle est placée dans une configuration parallèle. En utilisant la relation entre le courant Norton, la tension Thévenin et les valeurs du courant Norton, on peut déterminer le courant Norton du circuit. Cette relation rend le théorème de Norton bénéfique pour l'analyse et la conception de systèmes contenant des circuits AC complexes, car il simplifie leur analyse en décomposant le circuit en sections plus petites et plus faciles à gérer.

Circuits équivalents Norton

Le théorème de Norton stipule que tout réseau linéaire à deux bornes peut être remplacé par un circuit équivalent constitué d'une source de courant constant en ...

Education

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JoVE Core

Electrical Engineering

Génie électrique

Unit 1

Unité 1

AC Circuit Analysis

Analyse des circuits CA

KEY TERMS AND CONCEPTS

TERMES ET CONCEPTS CLÉS

Norton Equivalent Circuits

norton current in ac circuit analysis

Norton’s theorem helps simplify complex AC circuits by replacing a two-terminal linear network with a smaller equivalent circuit. That equivalent circuit uses an impedance in parallel with a constant current source. The method lets students break one complicated circuit into two parts and analyze them more easily.

To build the Norton equivalent, the source is replaced by its internal impedance. The result is the Norton impedance, which is the same as the Thévenin impedance. This parallel impedance is the key value used in the equivalent circuit.

Finding the Norton current takes one more step. The sources are placed back into the circuit, and the open-circuit voltage is analyzed. That voltage is also called the Thévenin voltage, and it can be found by multiplying the source current by the Thévenin impedance.

The Thévenin voltage helps show the same voltage drop across the load impedance when the load is arranged in parallel. Using the relationship between the Norton current, the Thévenin voltage, and the Norton impedance makes it possible to determine the circuit current. This makes Norton’s theorem useful for analyzing and designing systems with complex AC circuits because it turns a hard problem into smaller, more manageable parts.

Norton Current in AC Circuit Analysis

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Learn how Norton’s theorem simplifies complex AC circuits with a parallel current source and impedance, and how Norton current is determined from Thévenin values.

Norton Current in AC Circuit Analysis | JoVE K12

JoVE Core Electrical Engineering offers easy-to-understand animated videos that cover fundamental concepts of electric circuits along with circuit analysis techniques. It incorporates first-order and second-order circuits using operational amplifiers and circuit transformation concepts. The inclusion of practical design examples and real-world applications through scientist-in-action videos adds significant educational value, making complex concepts accessible.

electrical engineering

Norton Current in AC Circuit Analysis

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