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21 CuE  dtdqi 

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Texte intégral

(1)

Fiche révision Cas d’un circuit RC

Mots-clés, connaissances à savoir

Représentation symbolique du condensateur Relation charge-intensité

dt idq Relation charge-tension q = Cu Unités q (C) , C (F), i (A), t (s), u (V)

Constante de temps

=RC Energie emmagasinée

E Cu

2

2

 1

La tension aux bornes d’un condensateur n’est jamais discontinue

Savoir faire à maîtriser

Savoir orienter un circuit sur un schéma Savoir représenter les flèches-tension

Savoir noter les charges des armatures du condensateur Savoir exploiter la relation q = Cu

Savoir effectuer une résolution analytique pour u et pour q pour un condensateur soumis à un échelon de tension Savoir en déduire l’expression de l’intensité

Savoir vérifier l’unité de la constante de temps par analyse dimensionnelle Savoir identifier des tensions sur un document expérimental Savoir montrer l’influence de R et de C sur la charge et la décharge

Savoir déterminer une constante de temps

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