Sommaire général

Régimes variables

IV. Généralités sur les dipôles

3. Dipôles élémentaires

f. Source de courant

Définition

L'intensité du courant qui traverse une source de courant est indépendante de la tension à ses bornes : elle impose l'intensité dans la branche du circuit dans laquelle elle est insérée.

Symboles

Représentation symbolique avec les conventions générateur et récepteur :

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Tension aux bornes d'une source de courant

Dans le montage représenté ci-contre l'intensité du courant dans le circuit est imposée par la source de courant et égale à 5 A : d'après la loi d'Ohm, la tension aux bornes de la résistance est égale à 50 V.

Si la résistance tend vers l'infini alors la tension tend aussi vers l'infini.

Une source de courant ne doit pas être laissée en circuit ouvert car la tension à ses bornes tendrait vers l'infini.

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File: /datas/vol2/w4a149231/var/www/etasc.fr/htdocs/application/libraries/Layoutcours.php
Line: 46
Function: file

File: /datas/vol2/w4a149231/var/www/etasc.fr/htdocs/application/controllers/Page.php
Line: 294
Function: contenu

File: /datas/vol2/w4a149231/var/www/etasc.fr/htdocs/index.php
Line: 315
Function: require_once

A PHP Error was encountered

Severity: Notice

Message: A non well formed numeric value encountered

Filename: regVariables/sourceCourant.php

Line Number: 86

Backtrace:

File: /datas/vol2/w4a149231/var/www/etasc.fr/htdocs/assets/imgCours/physiqueGenerale/regVariables/sourceCourant.php
Line: 86
Function: _error_handler

File: /datas/vol2/w4a149231/var/www/etasc.fr/htdocs/application/libraries/Layoutcours.php
Line: 46
Function: file

File: /datas/vol2/w4a149231/var/www/etasc.fr/htdocs/application/controllers/Page.php
Line: 294
Function: contenu

File: /datas/vol2/w4a149231/var/www/etasc.fr/htdocs/index.php
Line: 315
Function: require_once

125">U

Réalisation pratique

Une alimentation stabilisée peut fonctionner en source de courant tant que la tension à ses bornes ne dépasse pas une valeur maximale.