Quiz — PilesFiles_TD_SUJET.pdf

Question 1 sur 10 20:00

[{"id":64376,"question":"Quelle est la tension aux bornes d'une pile de 1,5 V si elle est branchée seule à un circuit ?","option_a":"0 V","option_b":"1,5 V","option_c":"3 V","option_d":"6 V","option_e":"","option_f":"","bonne_reponse":"b","explication":"La tension aux bornes d'une pile seule est égale à sa force électromotrice (f.é.m.), ici 1,5 V.","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 V\", \"b\": \"1,5 V\", \"c\": \"3 V\", \"d\": \"6 V\"}}","_debug_options_count":4},{"id":64377,"question":"Dans un circuit en série, la tension totale est égale à la somme des tensions aux bornes de chaque dipôle.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est vrai : la loi des tensions en série stipule que U_total = U1 + U2 + ... + Un.","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":64378,"question":"Quelle est l'unité de la résistance électrique ?","option_a":"Volt (V)","option_b":"Ampère (A)","option_c":"Ohm (Ω)","option_d":"Watt (W)","option_e":"","option_f":"","bonne_reponse":"c","explication":"L'unité de la résistance est l'ohm (Ω), nommée d'après Georg Ohm.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"Volt (V)\", \"b\": \"Ampère (A)\", \"c\": \"Ohm (Ω)\", \"d\": \"Watt (W)\"}}","_debug_options_count":4},{"id":64379,"question":"Si on associe deux résistances de 10 Ω en parallèle, la résistance équivalente est :","option_a":"5 Ω","option_b":"10 Ω","option_c":"20 Ω","option_d":"40 Ω","option_e":"","option_f":"","bonne_reponse":"a","explication":"Pour des résistances en parallèle, la formule est 1\/R_eq = 1\/R1 + 1\/R2. Ici, 1\/R_eq = 1\/10 + 1\/10 = 2\/10 ⇒ R_eq = 5 Ω.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"5 Ω\", \"b\": \"10 Ω\", \"c\": \"20 Ω\", \"d\": \"40 Ω\"}}","_debug_options_count":4},{"id":64380,"question":"La loi d'Ohm s'écrit U = R × I.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La loi d'Ohm relie tension (U), résistance (R) et intensité (I) par la formule U = R × I.","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":64381,"question":"Quel dipôle fournit de l'énergie électrique dans un circuit ?","option_a":"Une résistance","option_b":"Une lampe","option_c":"Une pile","option_d":"Un fil de connexion","option_e":"","option_f":"","bonne_reponse":"c","explication":"La pile est un générateur qui convertit l'énergie chimique en énergie électrique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"Une résistance\", \"b\": \"Une lampe\", \"c\": \"Une pile\", \"d\": \"Un fil","_debug_options_count":4},{"id":64382,"question":"Si on double la tension aux bornes d'une résistance, l'intensité du courant :","option_a":"Diminue de moitié","option_b":"Double","option_c":"Reste la même","option_d":"Quadruple","option_e":"","option_f":"","bonne_reponse":"b","explication":"D'après la loi d'Ohm (U = R × I), si U double et R est constante, alors I double aussi.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Diminue de moitié\", \"b\": \"Double\", \"c\": \"Reste la même\", \"d\": \"","_debug_options_count":4},{"id":64383,"question":"Dans un circuit en parallèle, l'intensité totale est égale à la somme des intensités dans chaque branche.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est vrai : la loi des nœuds stipule que I_total = I1 + I2 + ... + In dans un circuit en parallèle.","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":64384,"question":"Quelle est la puissance dissipée par une résistance de 5 Ω traversée par un courant de 2 A ?","option_a":"5 W","option_b":"10 W","option_c":"20 W","option_d":"25 W","option_e":"","option_f":"","bonne_reponse":"c","explication":"La puissance P = R × I² = 5 × (2)² = 20 W.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"5 W\", \"b\": \"10 W\", \"c\": \"20 W\", \"d\": \"25 W\"}}","_debug_options_count":4},{"id":64385,"question":"Un fusible protège un circuit en coupant le courant lorsque l'intensité dépasse une valeur limite.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un fusible est un dispositif de sécurité qui fond et coupe le circuit si l'intensité dépasse son seuil maximal.","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}]