Quiz — Lycée Pilote Sfax - Bobine et RL.pdf

Question 1 sur 10 20:00

[{"id":97329,"question":"Quelle est l'unité de l'inductance L d'une bobine ?","option_a":"Henry (H)","option_b":"Farad (F)","option_c":"Ohm (Ω)","option_d":"Tesla (T)","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'inductance L s'exprime en Henry (H), unité dérivée du système international.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Henry (H)\", \"b\": \"Farad (F)\", \"c\": \"Ohm (Ω)\", \"d\": \"Tesla (T)\"}}","_debug_options_count":4},{"id":97330,"question":"Dans un circuit RL, la tension aux bornes de la bobine est proportionnelle à la dérivée du courant.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est exact : u_L = L * di\/dt, où u_L est la tension aux bornes de la bobine.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":97331,"question":"Quelle est l'expression de la constante de temps τ d'un circuit RL série ?","option_a":"τ = R\/L","option_b":"τ = L\/R","option_c":"τ = R*C","option_d":"τ = L*C","option_e":"","option_f":"","bonne_reponse":"b","explication":"La constante de temps τ d'un circuit RL est donnée par τ = L\/R, où L est l'inductance et R la résistance.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"τ = R\/L\", \"b\": \"τ = L\/R\", \"c\": \"τ = R*C\", \"d\": \"τ = L*C\"}}","_debug_options_count":4},{"id":97332,"question":"Lors de la charge d'un circuit RL, le courant atteint 63% de sa valeur maximale après :","option_a":"1τ","option_b":"2τ","option_c":"3τ","option_d":"5τ","option_e":"","option_f":"","bonne_reponse":"a","explication":"Après une durée égale à la constante de temps τ, le courant atteint environ 63% de sa valeur maximale.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"1τ\", \"b\": \"2τ\", \"c\": \"3τ\", \"d\": \"5τ\"}}","_debug_options_count":4},{"id":97333,"question":"L'énergie emmagasinée dans une bobine est donnée par la formule :","option_a":"E = ½ L i²","option_b":"E = ½ C u²","option_c":"E = R i²","option_d":"E = L i","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'énergie magnétique stockée dans une bobine est E = ½ L i², où L est l'inductance et i le courant.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"E = ½ L i²\", \"b\": \"E = ½ C u²\", \"c\": \"E = R i²\", \"d\": \"E = L","_debug_options_count":4},{"id":97334,"question":"Dans un circuit RL, la tension aux bornes de la résistance est en phase avec le courant.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est vrai : dans une résistance, la tension et le courant sont toujours en phase.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":97335,"question":"Quelle est la valeur de la constante de temps τ pour un circuit RL avec L = 0,5 H et R = 100 Ω ?","option_a":"0,005 s","option_b":"0,05 s","option_c":"5 s","option_d":"50 s","option_e":"","option_f":"","bonne_reponse":"b","explication":"τ = L\/R = 0,5\/100 = 0,005 s. Attention à bien convertir les unités si nécessaire.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"0,005 s\", \"b\": \"0,05 s\", \"c\": \"5 s\", \"d\": \"50 s\"}}","_debug_options_count":4},{"id":97336,"question":"Lors de la décharge d'un circuit RL, le courant décroît exponentiellement avec le temps.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est exact : lors de la décharge, le courant décroît selon une loi exponentielle i(t) = I₀ e^(-t\/τ).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":97337,"question":"Quelle grandeur physique est responsable de l'opposition au changement de courant dans une bobine ?","option_a":"La résistance R","option_b":"L'inductance L","option_c":"La capacité C","option_d":"La tension U","option_e":"","option_f":"","bonne_reponse":"b","explication":"C'est l'inductance L qui s'oppose aux variations rapides du courant (loi de Lenz).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"La résistance R\", \"b\": \"L'inductance L\", \"c\": \"La capacité C\", ","_debug_options_count":4},{"id":97338,"question":"Pour un circuit RL série, l'impédance totale Z est donnée par :","option_a":"Z = R + L","option_b":"Z = √(R² + (Lω)²)","option_c":"Z = R * L","option_d":"Z = L\/ω","option_e":"","option_f":"","bonne_reponse":"b","explication":"En régime sinusoïdal, l'impédance d'un circuit RL est Z = √(R² + (Lω)²), où ω est la pulsation.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Z = R + L\", \"b\": \"Z = √(R² + (Lω)²)\", \"c\": \"Z = R * L\", \"d\":","_debug_options_count":4}]