Quiz : Maîtrisez le dipôle RC en 10 questions !

Question 1 sur 10 10:00

[{"id":12638,"question":"Quelle est l'unité de la capacité électrique C d'un condensateur ?","option_a":"Farad (F)","option_b":"Henry (H)","option_c":"Ohm (Ω)","option_d":"Volt (V)","option_e":"","option_f":"","bonne_reponse":"A","explication":"La capacité électrique s'exprime en farads (F), symbole C.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":12639,"question":"Dans un circuit RC série, la tension aux bornes du condensateur est maximale lorsque :","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La tension aux bornes du condensateur est maximale en fin de charge (régime permanent), lorsque le courant devient nul.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":12640,"question":"Quelle formule relie la tension U aux bornes d'un condensateur à sa charge Q ?","option_a":"U = Q \/ C","option_b":"U = Q × C","option_c":"U = C \/ Q","option_d":"U = R × Q","option_e":"","option_f":"","bonne_reponse":"A","explication":"La relation est U = Q \/ C, où U est la tension, Q la charge et C la capacité.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":12641,"question":"La constante de temps τ d'un circuit RC dépend de :","option_a":"Seulement de la résistance R","option_b":"Seulement de la capacité C","option_c":"De R et C","option_d":"De la tension d'alimentation","option_e":"","option_f":"","bonne_reponse":"C","explication":"τ = R × C, donc elle dépend des deux paramètres R et C.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":12642,"question":"Lors de la décharge d'un condensateur, la tension à ses bornes :","option_a":"Diminue exponentiellement","option_b":"Reste constante","option_c":"Augmente linéairement","option_d":"Oscille","option_e":"","option_f":"","bonne_reponse":"A","explication":"La tension diminue exponentiellement avec le temps selon U(t) = U0 × e^(-t\/τ).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":12643,"question":"Quelle est l'expression de l'énergie stockée dans un condensateur chargé ?","option_a":"E = ½ C U²","option_b":"E = C U","option_c":"E = ½ R I²","option_d":"E = Q \/ C","option_e":"","option_f":"","bonne_reponse":"A","explication":"L'énergie stockée est donnée par E = ½ C U², où U est la tension aux bornes.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":12644,"question":"Dans un circuit RC série alimenté par une tension constante, le courant initial est :","option_a":"Nul","option_b":"Maximal","option_c":"Constant","option_d":"Oscillant","option_e":"","option_f":"","bonne_reponse":"B","explication":"Le courant initial est maximal car le condensateur se comporte comme un court-circuit au début de la charge.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":12645,"question":"La loi des mailles s'applique-t-elle à un circuit RC ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La loi des mailles (loi de Kirchhoff) s'applique à tout circuit électrique, y compris les circuits RC.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":12646,"question":"Quelle est la dimension de la constante de temps τ ?","option_a":"Seconde (s)","option_b":"Ohm (Ω)","option_c":"Farad (F)","option_d":"Volt (V)","option_e":"","option_f":"","bonne_reponse":"A","explication":"τ = R × C a pour dimension des secondes (s), car R est en ohms et C en farads.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":12647,"question":"Un condensateur de capacité C = 10 µF est chargé sous une tension U = 5 V. Quelle est l'énergie stockée ?","option_a":"125 µJ","option_b":"250 µJ","option_c":"62,5 µJ","option_d":"100 µJ","option_e":"","option_f":"","bonne_reponse":"A","explication":"E = ½ C U² = ½ × 10×10⁻⁶ × 5² = 125×10⁻⁶ J = 125 µJ.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]