Quiz : Maîtrisez le Dipôle RC en 10 questions !

Question 1 sur 10 10:00

[{"id":78602,"question":"Quel est l'ordre de grandeur de la constante de temps τ pour un circuit RC avec R = 1 kΩ et C = 1 µF ?","option_a":"1 ms","option_b":"1 s","option_c":"100 ms","option_d":"10 ms","option_e":"","option_f":"","bonne_reponse":"A","explication":"τ = RC = 1000 Ω × 1×10⁻⁶ F = 1×10⁻³ s = 1 ms.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":78603,"question":"Lors de la charge d'un condensateur, la tension à ses bornes augmente de manière :","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La tension aux bornes du condensateur suit une loi exponentielle croissante lors de la charge.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":78604,"question":"Quelle est l'expression de la tension aux bornes du condensateur en fonction du temps t pendant la charge ?","option_a":"U(t) = E(1 - e^(-t\/τ))","option_b":"U(t) = E e^(-t\/τ)","option_c":"U(t) = ERC","option_d":"U(t) = E\/(1 - e^(-t\/τ))","option_e":"","option_f":"","bonne_reponse":"A","explication":"La tension U(t) = E(1 - e^(-t\/τ)) où E est la tension du générateur et τ = RC.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":78605,"question":"La constante de temps τ dépend uniquement de la valeur de la résistance R.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"τ dépend à la fois de R et de C : τ = R × C.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":78606,"question":"Quel est le rôle d'un condensateur dans un circuit RC ?","option_a":"Stocker de l'énergie électrique","option_b":"Fournir un courant continu","option_c":"Convertir l'énergie électrique en chaleur","option_d":"Amplifier le signal","option_e":"","option_f":"","bonne_reponse":"A","explication":"Un condensateur stocke de l'énergie sous forme de champ électrique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":78607,"question":"L'énergie stockée dans un condensateur de capacité C = 10 µF sous une tension U = 12 V est :","option_a":"720 µJ","option_b":"720 mJ","option_c":"72 J","option_d":"7,2 J","option_e":"","option_f":"","bonne_reponse":"B","explication":"E = ½CU² = 0,5 × 10×10⁻⁶ × 12² = 720×10⁻³ J = 720 mJ.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":78608,"question":"Pendant la décharge d'un condensateur, la tension à ses bornes diminue de manière :","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La tension suit une loi exponentielle décroissante : U(t) = U₀ e^(-t\/τ).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":78609,"question":"Quelle est l'unité de la constante de temps τ ?","option_a":"Seconde (s)","option_b":"Farad (F)","option_c":"Ohm (Ω)","option_d":"Volt (V)","option_e":"","option_f":"","bonne_reponse":"A","explication":"τ = R × C, donc son unité est Ω × F = s (seconde).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":78610,"question":"Un circuit RC est alimenté par une tension continue E. Après un temps t = 3τ, la tension aux bornes du condensateur vaut environ :","option_a":"95% de E","option_b":"63% de E","option_c":"86% de E","option_d":"50% de E","option_e":"","option_f":"","bonne_reponse":"A","explication":"À t = 3τ, U(t) ≈ E(1 - e^(-3)) ≈ 0,95E (soit 95% de E).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":78611,"question":"La capacité C d'un condensateur s'exprime en :","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La capacité C s'exprime en Farad (F).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]