Maîtrisez le condensateur : charge, décharge et énergie

Question 1 sur 5 10:00

[{"id":1560,"question":"Quelle est l'unité de la capacité d'un condensateur ?","option_a":"Volt (V)","option_b":"Farad (F)","option_c":"Ampère (A)","option_d":"Ohm (Ω)","option_e":"","option_f":"","bonne_reponse":"B","explication":"La capacité s'exprime en farads (F), du nom du physicien Michael Faraday. 1 F = 1 C\/V (coulomb par volt).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":1561,"question":"Dans un circuit RC en série, quelle est la constante de temps τ ?","option_a":"τ = R + C","option_b":"τ = R \/ C","option_c":"τ = R · C","option_d":"τ = C \/ R","option_e":"","option_f":"","bonne_reponse":"C","explication":"La constante de temps τ = R·C détermine la rapidité de charge\/décharge. Plus R ou C est grand, plus τ est élevé.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":1562,"question":"Quelle formule donne l'énergie stockée dans un condensateur chargé ?","option_a":"E = C · U²","option_b":"E = ½ · C · U","option_c":"E = ½ · C · U²","option_d":"E = C \/ U²","option_e":"","option_f":"","bonne_reponse":"C","explication":"L'énergie stockée est E = ½·C·U², où C est la capacité et U la tension aux bornes du condensateur.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":1563,"question":"Un condensateur de 10 µF est chargé sous 12 V. Quelle est sa charge Q ?","option_a":"120 µC","option_b":"1200 µC","option_c":"12 µC","option_d":"1,2 mC","option_e":"","option_f":"","bonne_reponse":"A","explication":"Q = C·U = 10×10⁻⁶ F × 12 V = 120×10⁻⁶ C = 120 µC (microcoulombs).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":1564,"question":"Quel est le rôle d'un condensateur dans un circuit de filtrage ?","option_a":"Augmenter la tension","option_b":"Bloquer le courant continu","option_c":"Lisser les variations de tension","option_d":"Convertir le courant alternatif en continu","option_e":"","option_f":"","bonne_reponse":"C","explication":"En filtrage, le condensateur atténue les variations rapides de tension (ripple) en stockant et libérant de l'énergie.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]