{"segment":[{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" \u0110\u01a1n v\u1ecb c\u1ee7a nhi\u1ec7t l\u01b0\u1ee3ng Q l\u00e0:","select":["A. J (jun)","B. W (o\u00e1t)","C. N\/m","D. Kg.m"],"hint":"","explain":"<span class='basic_left'>\u0110\u01a1n v\u1ecb c\u1ee7a nhi\u1ec7t l\u01b0\u1ee3ng Q l\u00e0: J (jun)<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2971},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Trong c\u00e1c thi\u1ebft b\u1ecb d\u01b0\u1edbi \u0111\u00e2y, thi\u1ebft b\u1ecb \u0111i\u1ec7n n\u00e0o ch\u1ec9 chuy\u1ec3n h\u00f3a \u0111i\u1ec7n n\u0103ng th\u00e0nh nhi\u1ec7t n\u0103ng:","select":["A. M\u00e1y b\u01a1m n\u01b0\u1edbc","C. M\u00e1y vi t\u00ednh","B. Qu\u1ea1t \u0111i\u1ec7n","D. \u1ea4m \u0111un n\u01b0\u1edbc"],"hint":"","explain":"<span class='basic_left'>\u1ea4m \u0111un n\u01b0\u1edbc v\u1ec1 c\u01a1 b\u1ea3n ch\u1ec9 chuy\u1ec3n h\u00f3a \u0111i\u1ec7n n\u0103ng th\u00e0nh nhi\u1ec7t n\u0103ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2972},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"\u0110\u1ecbnh lu\u1eadt Jun \u2013 Lenx\u01a1 cho bi\u1ebft \u0111i\u1ec7n n\u0103ng bi\u1ebfn \u0111\u1ed5i th\u00e0nh nhi\u1ec7t n\u0103ng, v\u1eady nhi\u1ec7t n\u0103ng c\u00f3 th\u1ec3 bi\u1ebfn \u0111\u1ed5i th\u00e0nh c\u01a1 n\u0103ng, \u0111\u00e2u l\u00e0 v\u00ed d\u1ee5 v\u1ec1 vi\u1ec7c nhi\u1ec7t n\u0103ng bi\u1ebfn \u0111\u1ed5i th\u00e0nh c\u01a1 n\u0103ng?","select":["A. M\u00e1y b\u01a1m n\u01b0\u1edbc","B. \u0110\u1eadp th\u1ee7y \u0111i\u1ec7n","C. Nh\u00e0 m\u00e1y nhi\u1ec7t \u0111i\u1ec7n","D. N\u1ed3i c\u01a1m \u0111i\u1ec7n"],"hint":"","explain":"<span class='basic_left'>Nh\u00e0 m\u00e1y nhi\u1ec7t \u0111i\u1ec7n s\u1eed d\u1ee5ng nhi\u1ec7t t\u1eeb d\u1ea7u m\u1ecf, than \u0111\u00e1 \u0111\u1ec3 \u0111un n\u00f3ng n\u01b0\u1edbc, n\u01b0\u1edbc s\u00f4i b\u1ed1c h\u01a1i l\u00e0m quay tua bin ph\u00e1t \u0111i\u1ec7n. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2973},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"\u0110\u1ecbnh lu\u1eadt Jun \u2013 Lenx\u01a1 cho bi\u1ebft \u0111i\u1ec7n n\u0103ng bi\u1ebfn \u0111\u1ed5i th\u00e0nh: ","select":["A. C\u01a1 n\u0103ng.","B. N\u0103ng l\u01b0\u1ee3ng \u00e1nh s\u00e1ng.","C. H\u00f3a n\u0103ng","D. Nhi\u1ec7t n\u0103ng"],"hint":"","explain":"<span class='basic_left'>\u0110\u1ecbnh lu\u1eadt Jun \u2013 Lenx\u01a1 cho bi\u1ebft \u0111i\u1ec7n n\u0103ng bi\u1ebfn \u0111\u1ed5i th\u00e0nh: Nhi\u1ec7t n\u0103ng<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2974},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"\u0110\u00e2u l\u00e0 c\u00f4ng th\u1ee9c \u0111\u00fang c\u1ee7a \u0111\u1ecbnh lu\u1eadn Jun \u2013 Lenx\u01a1: ","select":["A. $Q=\\dfrac{{{I}^{2}}}{Rt}$ ","B. $Q=\\dfrac{I}{{{R}^{2}}t}$ ","C. $Q=\\dfrac{{{I}^{2}}t}{R}$","D. $Q={{I}^{2}}Rt$"],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2975},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" \u0110\u00e2u l\u00e0 c\u00f4ng th\u1ee9c \u0111\u00fang c\u1ee7a \u0111\u1ecbnh lu\u1eadn Jun \u2013 Lenx\u01a1:","select":["A. $Q=\\dfrac{{{U}^{2}}}{R}$","B. $Q=\\dfrac{U}{{{R}^{2}}}$","C. $Q=\\dfrac{U}{R}$","D. $Q=\\dfrac{{{U}^{2}}}{{{R}^{2}}}$"],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2976},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Khi t\u0103ng \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn g\u1ea5p \u0111\u00f4i v\u00e0 gi\u1ea3m c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n \u0111i m\u1ed9t n\u1eeda th\u00ec nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra tr\u00ean d\u00e2y d\u1eabn s\u1ebd nh\u01b0 th\u1ebf n\u00e0o?","select":["A. Gi\u1eef nguy\u00ean","B. Gi\u1ea3m c\u00f2n m\u1ed9t n\u1eeda","C. T\u0103ng g\u1ea5p \u0111\u00f4i","D. Kh\u00f4ng x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c"],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: <br\/>$Q={{I}^{2}}Rt$ <br\/>${{Q}^{'}}={{(\\dfrac{I}{2})}^{2}}\\times (2R)\\times t=\\dfrac{1}{2}{{I}^{2}}Rt=\\dfrac{1}{2}Q$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2977},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Khi m\u00e1y b\u01a1m n\u01b0\u1edbc ho\u1ea1t \u0111\u1ed9ng, \u0111i\u1ec7n n\u0103ng \u0111\u00e3 \u0111\u01b0\u1ee3c chuy\u1ec3n h\u00f3a th\u00e0nh nh\u1eefng d\u1ea1ng ch\u00ednh n\u00e0o? ","select":["A. Ch\u1ec9 c\u01a1 n\u0103ng","B. Ch\u1ec9 nhi\u1ec7t n\u0103ng","C. C\u1ea3 c\u01a1 n\u0103ng v\u00e0 nhi\u1ec7t n\u0103ng","D. C\u01a1 n\u0103ng, nhi\u1ec7t n\u0103ng v\u00e0 quang n\u0103ng."],"hint":"","explain":"<span class='basic_left'>Khi m\u00e1y b\u01a1m n\u01b0\u1edbc ho\u1ea1t \u0111\u1ed9ng, \u0111i\u1ec7n n\u0103ng \u0111\u00e3 \u0111\u01b0\u1ee3c chuy\u1ec3n h\u00f3a th\u00e0nh c\u01a1 n\u0103ng l\u00e0m n\u01b0\u1edbc \u0111\u01b0\u1ee3c b\u01a1m v\u00e0 nhi\u1ec7t n\u0103ng do t\u1ecfa nhi\u1ec7t tr\u00ean d\u00e2y qu\u1ea5n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2978},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Khi ta \u0111un n\u01b0\u1edbc b\u1eb1ng \u1ea5m \u0111i\u1ec7n, c\u00f3 ph\u1ea3i t\u1ea5t c\u1ea3 \u0111i\u1ec7n n\u0103ng \u0111\u1ec1u chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng l\u00e0m s\u00f4i n\u01b0\u1edbc kh\u00f4ng? ","select":["A. \u0110\u00fang v\u1eady, t\u1ea5t c\u1ea3 \u0111i\u1ec7n n\u0103ng \u0111\u1ec1u chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng l\u00e0m s\u00f4i n\u01b0\u1edbc.","B. Kh\u00f4ng th\u1ec3 k\u1ebft lu\u1eadn \u0111\u01b0\u1ee3c v\u00ec c\u00f2n t\u00f9y tr\u01b0\u1eddng h\u1ee3p.","C. Kh\u00f4ng \u0111\u00fang, v\u00ec ngo\u00e0i \u0111i\u1ec7n n\u0103ng \u0111\u1ec1u chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng l\u00e0m s\u00f4i n\u01b0\u1edbc, c\u00f2n c\u00f3 l\u01b0\u1ee3ng nhi\u1ec7t b\u1ecb ti\u00eau hao ra ngo\u00e0i m\u00f4i tr\u01b0\u1eddng l\u00e0m n\u00f3ng \u1ea5m v\u00e0 kh\u00f4ng kh\u00ed.","D. T\u1ea5t c\u1ea3 \u0111\u1ec1u sai."],"hint":"","explain":"<span class='basic_left'>Khi ta \u0111un n\u01b0\u1edbc b\u1eb1ng \u1ea5m \u0111i\u1ec7n ngo\u00e0i \u0111i\u1ec7n n\u0103ng \u0111\u1ec1u chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng l\u00e0m s\u00f4i n\u01b0\u1edbc, c\u00f2n c\u00f3 l\u01b0\u1ee3ng nhi\u1ec7t b\u1ecb ti\u00eau hao ra ngo\u00e0i m\u00f4i tr\u01b0\u1eddng l\u00e0m n\u00f3ng \u1ea5m v\u00e0 kh\u00f4ng kh\u00ed.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2979},{"time":24,"part":[{"title":"C\u00e2u ph\u00e1t bi\u1ec3u n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 kh\u00f4ng \u0111\u00fang?","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra \u1edf d\u00e2y d\u1eabn khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua:","select":["A. T\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n, v\u1edbi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn v\u1edbi th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua.","B. T\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi b\u00ecnh ph\u01b0\u01a1ng c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n, v\u1edbi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn v\u00e0 v\u1edbi th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua.","C. T\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi b\u00ecnh ph\u01b0\u01a1ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y d\u1eabn, v\u1edbi th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua v\u00e0 t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111i\u1ec7n tr\u1edf d\u00e2y d\u1eabn.","D. T\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y d\u1eabn, v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n v\u00e0 v\u1edbi th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra \u1edf d\u00e2y d\u1eabn khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua: <br\/> T\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi b\u00ecnh ph\u01b0\u01a1ng c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n, v\u1edbi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn v\u00e0 v\u1edbi th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua. <br\/> T\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi b\u00ecnh ph\u01b0\u01a1ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y d\u1eabn, v\u1edbi th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua v\u00e0 t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111i\u1ec7n tr\u1edf d\u00e2y d\u1eabn. <br\/> T\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y d\u1eabn, v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n v\u00e0 v\u1edbi th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2980},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"M\u1eafc c\u00e1c d\u00e2y d\u1eabn v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf kh\u00f4ng \u0111\u1ed5i. Trong c\u00f9ng m\u1ed9t th\u1eddi gian th\u00ec nhi\u1ec7t l\u01b0\u1ee3ng to\u1ea3 ra tr\u00ean d\u00e2y d\u1eabn ph\u1ee5 thu\u1ed9c nh\u01b0 th\u1ebf n\u00e0o v\u00e0o \u0111i\u1ec7n tr\u1edf d\u00e2y d\u1eabn?","select":["A. T\u0103ng g\u1ea5p \u0111\u00f4i khi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn gi\u1ea3m \u0111i m\u1ed9t n\u1eeda.","B. T\u0103ng g\u1ea5p \u0111\u00f4i khi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn t\u0103ng l\u00ean g\u1ea5p \u0111\u00f4i.","C. T\u0103ng g\u1ea5p b\u1ed1n khi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn gi\u1ea3m \u0111i m\u1ed9t n\u1eeda.","D. Gi\u1ea3m \u0111i m\u1ed9t n\u1eeda khi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn t\u0103ng l\u00ean g\u1ea5p b\u1ed1n."],"hint":"","explain":"<span class='basic_left'>M\u1eafc c\u00e1c d\u00e2y d\u1eabn v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf kh\u00f4ng \u0111\u1ed5i. <br\/>Trong c\u00f9ng m\u1ed9t th\u1eddi gian th\u00ec nhi\u1ec7t l\u01b0\u1ee3ng to\u1ea3 ra tr\u00ean d\u00e2y d\u1eabn ph\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec7n tr\u1edf d\u00e2y d\u1eabn: <br\/>T\u0103ng g\u1ea5p \u0111\u00f4i khi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn t\u0103ng l\u00ean g\u1ea5p \u0111\u00f4i: v\u00ec nhi\u1ec7t l\u01b0\u1ee3ng \u0111\u01b0\u1ee3c t\u00ednh theo c\u00f4ng th\u1ee9c: $Q={{I}^{2}}Rt$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2981},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Th\u1eddi gian \u0111un s\u00f4i 1,5 l\u00edt n\u01b0\u1edbc c\u1ee7a m\u1ed9t \u1ea5m \u0111i\u1ec7n l\u00e0 10 ph\u00fat. Hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y nung c\u1ee7a \u1ea5m l\u00e0 220V. T\u00ednh \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y nung n\u00e0y, bi\u1ebft r\u1eb1ng n\u1ebfu k\u1ec3 c\u1ea3 nhi\u1ec7t l\u01b0\u1ee3ng hao ph\u00ed \u0111\u1ec3 \u0111un s\u00f4i 1 l\u00edt n\u01b0\u1edbc th\u00ec c\u1ea7n nhi\u1ec7t l\u01b0\u1ee3ng l\u00e0 420000J.","select":["A. 28\u2126","B. 45\u2126","C. 46,1\u2126","D. 23\u2126"],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n cung c\u1ea5p \u0111\u1ec3 \u0111un s\u00f4i 1,5 l\u00edt n\u01b0\u1edbc l\u00e0: <br\/> $Q=420000\\times 1,5=630000J$ <br\/> Theo c\u00f4ng th\u1ee9c t\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra c\u1ee7a \u1ea5m ta c\u00f3: <br\/> $Q={{I}^{2}}Rt=\\dfrac{{{U}^{2}}}{R}t$ <br\/> suy ra $R=\\dfrac{{{U}^{2}}\\times t}{Q}=\\dfrac{{{220}^{2}}\\times 10\\times 60}{630000}=46,1\\Omega $ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2982},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"D\u00f2ng \u0111i\u1ec7n c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 2mA ch\u1ea1y qua m\u1ed9t \u0111i\u1ec7n tr\u1edf 3k\u2126 trong th\u1eddi gian 10 ph\u00fat th\u00ec nhi\u1ec7t l\u01b0\u1ee3ng to\u1ea3 ra \u1edf \u0111i\u1ec7n tr\u1edf n\u00e0y c\u00f3 gi\u00e1 tr\u1ecb n\u00e0o d\u01b0\u1edbi \u0111\u00e2y?","select":["A. Q = 7,2J","B. Q = 60J ","C. Q = 120J","D. Q = 3600J"],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra tr\u00ean \u0111i\u1ec7n tr\u1edf l\u00e0: <br\/> $Q={{I}^{2}}Rt=0,{{002}^{2}}\\times 3600\\times 600=7,2J$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2983},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"M\u1ed9t b\u1ebfp \u0111i\u1ec7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf 220V th\u00ec d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua b\u1ebfp \u0111i\u1ec7n c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 3A. D\u00f9ng b\u1ebfp n\u00e0y \u0111un s\u00f4i \u0111\u01b0\u1ee3c 2 l\u00edt n\u01b0\u1edbc t\u1eeb nhi\u1ec7t \u0111\u1ed9 ban \u0111\u1ea7u 200 trong th\u1eddi gian 20 ph\u00fat. T\u00ednh hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ebfp \u0111i\u1ec7n, bi\u1ebft nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 c = 4200J\/kg.K","select":["A. $64,4{\\scriptstyle{}^{0}\/{}_{0}}$ ","B. $44,4{\\scriptstyle{}^{0}\/{}_{0}}$","C. $24,4{\\scriptstyle{}^{0}\/{}_{0}}$","D. $84,4{\\scriptstyle{}^{0}\/{}_{0}}$"],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng m\u00e0 b\u1ebfp t\u1ecfa ra trong 20 ph\u00fat l\u00e0: <br\/>${{Q}_{tp}}=UIt=220\\times 3\\times 20\\times 60=792000J$ <br\/>Nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n cung c\u1ea5p \u0111\u1ec3 \u0111un s\u00f4i l\u01b0\u1ee3ng n\u01b0\u1edbc n\u00e0y l\u00e0: <br\/>${{Q}_{i}}=cm({{t}_{2}}^{0}-{{t}_{1}}^{0})=4200\\times 2\\times 80=672000J$ <br\/>Hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ebfp l\u00e0: <br\/>$H=\\dfrac{{{Q}_{i}}}{{{Q}_{tp}}}=\\dfrac{67200}{79200}=84,4{\\scriptstyle{}^{0}\/{}_{0}}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2984},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Khi m\u1eafc m\u1ed9t b\u00e0n l\u00e0 v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf 110V th\u00ec d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 5A. B\u00e0n l\u00e0 n\u00e0y s\u1eed d\u1ee5ng nh\u01b0 v\u1eady trung b\u00ecnh 15 ph\u00fat m\u1ed7i ng\u00e0y. T\u00ednh \u0111i\u1ec7n n\u0103ng m\u00e0 b\u00e0n l\u00e0 ti\u00eau th\u1ee5 trong 30 ng\u00e0y theo \u0111\u01a1n v\u1ecb kW.h ","select":["A. 3,475 (kW.h)","B. 2,125 (kW.h)","C. 4,25 (kW.h) ","D. 4,125 (kW.h)"],"hint":"","explain":"<span class='basic_left'>C\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 c\u1ee7a b\u00e0n l\u00e0 : <br\/>$P=UI=110\\times 5=550W$ <br\/>\u0110i\u1ec7n n\u0103ng m\u00e0 b\u00e0n l\u00e0 ti\u00eau th\u1ee5 trong 30 ng\u00e0y: <br\/>$A=Pt=0,55\\times 30\\times 0,25=4,125kW$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2985},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" Khi m\u1eafc m\u1ed9t b\u00e0n l\u00e0 v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf 110V th\u00ec d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 5A. B\u00e0n l\u00e0 n\u00e0y s\u1eed d\u1ee5ng nh\u01b0 v\u1eady trung b\u00ecnh 15 ph\u00fat m\u1ed7i ng\u00e0y. T\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng m\u00e0 b\u00e0n l\u00e0 t\u1ecfa ra trong 30 ng\u00e0y theo \u0111\u01a1n v\u1ecb kJ, cho r\u1eb1ng \u0111i\u1ec7n m\u00e0 b\u00e0n l\u00e0 n\u00e0y ti\u00eau th\u1ee5 \u0111\u01b0\u1ee3c bi\u1ebfn \u0111\u1ed5i ho\u00e0n to\u00e0n th\u00e0nh nhi\u1ec7t n\u0103ng.","select":["A. 1485 (kJ)","B. 1375 (kJ)","C. 1225 (kJ)","D. 1550 (kJ)"],"hint":"","explain":"<span class='basic_left'>C\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 c\u1ee7a b\u00e0n l\u00e0 : <br\/>$P=UI=110\\times 5=550W$ <br\/>\u0110i\u1ec7n n\u0103ng m\u00e0 b\u00e0n l\u00e0 ti\u00eau th\u1ee5 trong 30 ng\u00e0y: <br\/>$A=Pt=0,55\\times 30\\times 0,25=4,125kW$ <br\/>Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra c\u1ee7a b\u00e0n l\u00e0: <br\/>$Q\\text{ }=\\text{ }4,125\\times 3,6\\times {{10}^{6}}\\text{ }=14850000\\left( J \\right)=1485\\text{ }\\left( kJ \\right)$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2986},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" Trong m\u00f9a \u0111\u00f4ng, m\u1ed9t l\u00f2 s\u01b0\u1edfi \u0111i\u1ec7n c\u00f3 ghi 220V-880W \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf 220V trong 4 gi\u1edd m\u1ed7i ng\u00e0y. T\u00ednh c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 d\u00e2y nung","select":["A. 1A","B. 2A","C. 3A","D. 4A"],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y nung : <br\/>$\\wp =\\dfrac{{{U}^{2}}}{R}\\Rightarrow R=\\dfrac{{{U}^{2}}}{\\wp }=\\dfrac{{{220}^{2}}}{880}=55\\Omega $ <br\/>C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3: <br\/>$\\wp =I\\times U\\Rightarrow I=\\dfrac{\\wp }{U}=\\dfrac{880}{220}=4A$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2987},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Trong m\u00f9a \u0111\u00f4ng, m\u1ed9t l\u00f2 s\u01b0\u1edfi \u0111i\u1ec7n c\u00f3 ghi 220V-880W \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf 220V trong 4 gi\u1edd m\u1ed7i ng\u00e0y. T\u00ednh ti\u1ec1n \u0111i\u1ec7n ph\u1ea3i tr\u1ea3 cho vi\u1ec7c d\u00f9ng l\u00f2 s\u01b0\u1edfi nh\u01b0 tr\u00ean trong su\u1ed1t m\u00f9a \u0111\u00f4ng, t\u1ed5ng c\u1ed9ng l\u00e0 30 ng\u00e0y. Cho r\u1eb1ng gi\u00e1 ti\u1ec1n \u0111i\u1ec7n l\u00e0 1000\u0111\/kW.h ","select":["A. 142000 \u0111\u1ed3ng","B. 135000 \u0111\u1ed3ng","C. 105600 \u0111\u1ed3ng","D. 122500 \u0111\u1ed3ng"],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y nung : <br\/>$\\wp =\\dfrac{{{U}^{2}}}{R}\\Rightarrow R=\\dfrac{{{U}^{2}}}{\\wp }=\\dfrac{{{220}^{2}}}{880}=55\\Omega $ <br\/>C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3: <br\/>$\\wp =I\\times U\\Rightarrow I=\\dfrac{\\wp }{U}=\\dfrac{880}{220}=4A$ <br\/>Ti\u1ec1n \u0111i\u1ec7n ph\u1ea3i tr\u1ea3: $T\\text{ }=\\text{ }3,52\\times 30\\times 1000=105600$ \u0111\u1ed3ng<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2988},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"M\u1ed9t d\u00e2y d\u1eabn c\u00f3 \u0111i\u1ec7n tr\u1edf 176\u03a9 \u0111\u01b0\u1ee3c m\u1eafc v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf 220V. T\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng do d\u00e2y t\u1ecfa ra trong 30 ph\u00fat theo \u0111\u01a1n v\u1ecb jun v\u00e0 \u0111\u01a1n v\u1ecb calo. Nhi\u1ec7t l\u01b0\u1ee3ng do d\u00e2y t\u1ecfa trong 30 ph\u00fat l\u00e0: ","select":["A. 495000J=118800cal","B. 49500J=11880cal","C. 4950J=1188cal","D. 4950000J=1188000cal"],"hint":"","explain":"<span class='basic_left'>$Q=\\dfrac{{{U}^{2}}}{R}\\timest=\\dfrac{{{220}^{2}}}{176}\\times30\\times 60=495000J=118800cal$. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2989},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Khi m\u1eafc m\u1ed9t thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n tr\u1edf 50 \u03a9 v\u00e0o m\u1ea1ch \u0111i\u1ec7n c\u00f3 hi\u1ec7u \u0111i\u1ec7n th\u1ebf U=100V. T\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra trong 5 ph\u00fat. ","select":["A. 10KJ","B. 30KJ","C. 60KJ","D. 90KJ"],"hint":"","explain":"<span class='basic_left'> $Q=\\dfrac{{{U}^{2}}}{R}\\timest=\\dfrac{{{100}^{2}}}{50}\\times5\\times 60=60000J=60KJ$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2990}],"lesson":{"save":0,"level":2}}