{"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":"Khi \u0111\u1eb7t hi\u1ec7u \u0111i\u1ec7n th\u1ebf 12V v\u00e0o hai \u0111\u1ea7u m\u1ed9t d\u00e2y d\u1eabn th\u00ec d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 6mA. Mu\u1ed1n d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y d\u1eabn \u0111\u00f3 c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 gi\u1ea3m \u0111i 4mA th\u00ec hi\u1ec7u \u0111i\u1ec7n th\u1ebf l\u00e0: ","select":["A. 4V","B. 2V","C. 8V","D. 4000V"],"hint":"","explain":"<span class='basic_left'>L\u00fac ch\u01b0a gi\u1ea3m th\u00ec hi\u1ec7u \u0111i\u1ec7n th\u1ebf g\u1ea5p 2000 l\u1ea7n c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n n\u00ean sau khi gi\u1ea3m ta th\u1ea5y c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n c\u00f2n 2mA . <br\/> V\u1eady hi\u1ec7u \u0111i\u1ec7n th\u1ebf l\u00fac \u0111\u00f3 s\u1ebd l\u00e0: $U=2000\\times 0,002=4V$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2711},{"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":"V\u00f4n k\u1ebf c\u00f3 c\u00f4ng d\u1ee5ng :","select":["A. \u0110o c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n.","B. \u0110o c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n v\u00e0 hi\u1ec7u \u0111i\u1ec7n th\u1ebf.","C. \u0110o c\u00f4ng su\u1ea5t d\u00f2ng \u0111i\u1ec7n.","D. \u0110o hi\u1ec7u \u0111i\u1ec7n th\u1ebf."],"hint":"","explain":"<span class='basic_left'>V\u00f4n k\u1ebf c\u00f3 c\u00f4ng d\u1ee5ng \u0111\u1ec3 \u0111o hi\u1ec7u \u0111i\u1ec7n th\u1ebf. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2712},{"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":"N\u1ebfu t\u0103ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u m\u1ed9t d\u00e2y d\u1eabn l\u00ean 4 l\u1ea7n th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y d\u1eabn n\u00e0y thay \u0111\u1ed5i nh\u01b0 th\u1ebf n\u00e0o?","select":["A. Gi\u1ea3m 4 l\u1ea7n","B. T\u0103ng 4 l\u1ea7n","C. Kh\u00f4ng thay \u0111\u1ed5i","D. T\u0103ng 2 l\u1ea7n"],"hint":"","explain":"<span class='basic_left'>N\u1ebfu t\u0103ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u m\u1ed9t d\u00e2y d\u1eabn l\u00ean 4 l\u1ea7n th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y d\u1eabn n\u00e0y t\u0103ng l\u00ean 4 l\u1ea7n<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2713},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai1/lv2/img\/h4.jpg'\/><\/center>Tr\u00ean h\u00ecnh l\u00e0 hai \u0111\u1ed3 th\u1ecb do hai h\u1ecdc sinh a v\u00e0 b v\u1ebd \u0111\u01b0\u1ee3c khi l\u00e0m th\u00ed nghi\u1ec7m x\u00e1c \u0111inh li\u00ean h\u1ec7 gi\u1eefa c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n v\u00e0 hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn.","select":["A. C\u1ea3 hai k\u1ebft qu\u1ea3 \u0111\u1ec1u \u0111\u00fang.","B. C\u1ea3 hai k\u1ebft qu\u1ea3 \u0111\u1ec1u sai.","C. K\u1ebft qu\u1ea3 c\u1ee7a b \u0111\u00fang.","D. K\u1ebft qu\u1ea3 c\u1ee7a a \u0111\u00fang."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed3 th\u1ecb bi\u1ec3u di\u1ec5n s\u1ef1 ph\u1ee5 thu\u1ed9c c\u1ee7a I v\u00e0o U l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng \u0111i qua g\u1ed1c t\u1ecda \u0111\u1ed9 ( U = 0, I= 0) n\u00ean h\u00ecnh b l\u00e0 v\u1ebd \u0111\u00fang. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2714},{"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 \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn m\u1ed9t hi\u1ec7u \u0111i\u1ec7n th\u1ebf 12V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 l\u00e0 0,5A. N\u1ebfu hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn \u0111\u00f3 t\u0103ng l\u00ean \u0111\u1ebfn 36V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 l\u00e0 bao nhi\u00eau ?","select":["A. 0,5A","B. 1,5A","C. 1,0A","D. 2,0A"],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: $\\dfrac{12}{0,5}=\\dfrac{36}{I}$<br\/>V\u1eady c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua l\u00e0: <br\/> $I=\\dfrac{36\\times 0,5}{12}=1,5A$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2715},{"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":"C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua m\u1ed9t d\u00e2y d\u1eabn l\u00e0 1,5A khi n\u00f3 \u0111\u01b0\u1ee3c m\u1eafc v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf 12V. Mu\u1ed1n d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y d\u1eabn \u0111\u00f3 t\u0103ng th\u00eam 0,5A th\u00ec hi\u1ec7u \u0111i\u1ec7n th\u1ebf ph\u1ea3i l\u00e0 bao nhi\u00eau ?","select":["A. 8V","B. 12V","C. 16V","D. 20V"],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: $\\dfrac{12}{0,5}=\\dfrac{U}{2}$<br\/>V\u1eady hi\u1ec7u \u0111i\u1ec7n th\u1ebf l\u00e0: $\\dfrac{12\\times 2}{1,5}=16V$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2716},{"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 \u0111\u1eb7t m\u1ed9t hi\u1ec7u \u0111i\u1ec7n th\u1ebf 10 V gi\u1eefa hai \u0111\u1ea7u m\u1ed9t d\u00e2y d\u1eabn th\u00ec d\u00f2ng \u0111i\u1ec7n \u0111i qua n\u00f3 c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 l\u00e0 1,25 A. H\u1ecfi ph\u1ea3i gi\u1ea3m hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y n\u00e0y \u0111i m\u1ed9t l\u01b0\u1ee3ng l\u00e0 bao nhi\u00eau \u0111\u1ec3 d\u00f2ng \u0111i\u1ec7n \u0111i qua d\u00e2y ch\u1ec9 c\u00f2n l\u00e0 0,75 A ?","select":["A. 1V","B. 2V","C. 3V","D. 4V"],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: ${{U}_{1}}=10V$ \u1ee9ng v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ${{I}_{1}}=1,25A$, ${{U}_{2}}$ \u1ee9ng v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n $I_{2}^{{}}=0,75A$. <br\/> $U_{2}^{{}}=\\dfrac{0,75\\times 10}{1,25}=6V$<br\/>V\u1eady ph\u1ea3i gi\u1ea3m hi\u1ec7u \u0111i\u1ec7n th\u1ebf m\u1ed9t l\u01b0\u1ee3ng l\u00e0: $10-6=4V$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2717},{"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":"C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n \u0111i qua m\u1ed9t d\u00e2y d\u1eabn l\u00e0 khi hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y d\u1eabn n\u00e0y l\u00e0 $U_{1}^{{}}$= 7,2 V. D\u00f2ng \u0111i\u1ec7n \u0111i qua d\u00e2y d\u1eabn n\u00e0y s\u1ebd c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 $I_{2}^{{}}$ l\u1edbn g\u1ea5p $I_{1}^{{}}$bao nhi\u00eau l\u1ea7n n\u1ebfu hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u c\u1ee7a n\u00f3 t\u0103ng th\u00eam 10,8 V ?","select":["A. 1,5 l\u1ea7n","B. 3 l\u1ea7n","C. 2,5 l\u1ea7n","D. 2 l\u1ea7n"],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3 t\u1ec9 l\u1ec7:<br\/>$\\dfrac{I_{1}^{{}}}{I_{2}^{{}}}=\\dfrac{U_{1}^{{}}}{U_{2}^{{}}}=\\dfrac{7,2}{10,8+7,2}=\\dfrac{1}{2,5}\\Rightarrow I_{2}^{{}}=2,5I_{2}^{{}}$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2718},{"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 d\u00e2y d\u1eabn \u0111\u01b0\u1ee3c m\u1eafc v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf 6V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 l\u00e0 0,3A. N\u1ebfu gi\u1ea3m hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn \u0111i 2V th\u00ec d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y khi \u0111\u00f3 c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 l\u00e0 bao nhi\u00eau?","select":["A. 0,05A","B. 0,15A","C. 0,1A","D. 0,2A"],"hint":"","explain":"<span class='basic_left'>Hi\u1ec7u \u0111i\u1ec7n th\u1ebf sau khi gi\u1ea3m 2V c\u00f2n l\u1ea1i 4V, ta c\u00f3: $\\dfrac{6}{0,3}=\\dfrac{4}{I}$ <br\/>V\u1eady c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n khi \u0111\u00f3 l\u00e0: $I=\\dfrac{4\\times 0,3}{6}=0,2A$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2719},{"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":"C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua m\u1ed9t d\u00e2y d\u1eabn ph\u1ee5 thu\u1ed9c nh\u01b0 th\u1ebf n\u00e0o v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y d\u1eabn \u0111\u00f3 ?","select":["A. Kh\u00f4ng thay \u0111\u1ed5i khi thay \u0111\u1ed5i hi\u1ec7u \u0111i\u1ec7n th\u1ebf.","B. T\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf.","C. T\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf.","D. Gi\u1ea3m khi t\u0103ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf."],"hint":"","explain":"<span class='basic_left'>C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua m\u1ed9t d\u00e2y d\u1eabn t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y d\u1eabn \u0111\u00f3. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2720},{"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":"D\u00f2ng \u0111i\u1ec7n \u0111i qua m\u1ed9t d\u00e2y d\u1eabn c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 $I_{1}^{{}}$ khi hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y l\u00e0 12 V. \u0110\u1ec3 d\u00f2ng \u0111i\u1ec7n n\u00e0y c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 $I_{2}^{{}}$ nh\u1ecf h\u01a1n $I_{1}^{{}}$ m\u1ed9t l\u01b0\u1ee3ng l\u00e0 0,6 $I_{1}^{{}}$ th\u00ec ph\u1ea3i \u0111\u1eb7t gi\u1eefa hai \u0111\u1ea7u d\u00e2y n\u00e0y m\u1ed9t hi\u1ec7u \u0111i\u1ec7n th\u1ebf l\u00e0 bao nhi\u00eau ?","select":["A. 7,2 V","B. 4,8 V","C. 11,4 V","D. 19,2 V"],"hint":"","explain":"<span class='basic_left'>$\\dfrac{U_{1}^{{}}}{I_{1}^{{}}}=\\dfrac{U_{2}^{{}}}{I_{2}^{{}}}\\Rightarrow\\dfrac{U_{1}^{{}}}{I_{1}^{{}}}=\\dfrac{U_{2}^{{}}}{I_{1}^{{}}-0,6I_{1}^{{}}}$<br\/>$\\Rightarrow \\dfrac{U_{1}^{{}}}{I_{1}^{{}}}=\\dfrac{U_{2}^{{}}}{0,4I_{1}^{{}}}\\RightarrowU_{2}^{{}}=\\dfrac{0,4I_{1}^{{}}}{I_{1}^{{}}}\\times U_{1}^{{}}=0,4\\times 12=4,8V$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2721},{"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":"Ta \u0111\u00e3 bi\u1ebft r\u1eb1ng \u0111\u1ec3 t\u0103ng t\u00e1c d\u1ee5ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n, v\u00ed d\u1ee5 nh\u01b0 \u0111\u1ec3 \u0111\u00e8n s\u00e1ng h\u01a1n, th\u00ec ph\u1ea3i t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua b\u00f3ng \u0111\u00e8n \u0111\u00f3. Th\u1ebf nh\u01b0ng tr\u00ean th\u1ef1c t\u1ebf th\u00ec ng\u01b0\u1eddi ta l\u1ea1i t\u0103ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u b\u00f3ng \u0111\u00e8n. H\u00e3y gi\u1ea3i th\u00edch t\u1ea1i sao?","select":["A. V\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ph\u1ee5 thu\u1ed9c v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf.","B. V\u00ec hi\u1ec7u \u0111i\u1ec7n th\u1ebf ph\u1ee5 thu\u1ed9c v\u00e0o c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n.","C. V\u00ec t\u0103ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf d\u1ec5 d\u00e0ng h\u01a1n.","D. Kh\u00f4ng c\u00f3 \u0111\u00e1p \u00e1n \u0111\u00fang."],"hint":"","explain":"<span class='basic_left'>V\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ph\u1ee5 thu\u1ed9c v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf, n\u00ean khi t\u0103ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n c\u0169ng t\u0103ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2722},{"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":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng:<br\/>... d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua m\u1ed9t d\u00e2y d\u1eabn t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn \u0111\u00f3.","select":["A. \u0110i\u1ec7n t\u00edch.","B. \u0110i\u1ec7n l\u01b0\u1ee3ng.","C. Hi\u1ec7u \u0111i\u1ec7n th\u1ebf.","D. C\u01b0\u1eddng \u0111\u1ed9."],"hint":"","explain":"<span class='basic_left'>C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua m\u1ed9t d\u00e2y d\u1eabn t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn \u0111\u00f3.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2723},{"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 \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn m\u1ed9t hi\u1ec7u \u0111i\u1ec7n th\u1ebf 12V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n qua n\u00f3 l\u00e0 0,6A. N\u1ebfu c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 l\u00e0 1A th\u00ec hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn l\u00e0:","select":["A. 12V.","B. 9V.","C. 20V.","D. 18V."],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: $\\dfrac{12}{0,6}=\\dfrac{U}{1}$<br\/>V\u1eady hi\u1ec7u \u0111i\u1ec7n th\u1ebf l\u00e0: $U=\\dfrac{12\\times 1}{0,6}=20V$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2724},{"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":"C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua m\u1ed9t b\u00f3ng \u0111\u00e8n l\u00e0 1,2A khi m\u1eafc n\u00f3 v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf 12V. Mu\u1ed1n c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua b\u00f3ng \u0111\u00e8n t\u0103ng th\u00eam 0,3A th\u00ec hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u b\u00f3ng \u0111\u00e8n t\u0103ng ho\u1eb7c gi\u1ea3m bao nhi\u00eau?","select":["A. T\u0103ng 5V.","B. T\u0103ng 3V.","C. Gi\u1ea3m 3V.","D. Gi\u1ea3m 2V."],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: $U_{1}^{{}}=12V$ \u1ee9ng v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n $I_{1}^{{}}=1,2A$<br\/>$U_{2}^{{}}$ \u1ee9ng v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n: $I_{2}^{{}}=1,2+0,3=1,5A$<br\/>$\\Rightarrow $ $U_{2}^{{}}=\\dfrac{1,5\\times 12}{1,2}=15V$<br\/>V\u1eady ph\u1ea3i t\u0103ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf m\u1ed9t l\u01b0\u1ee3ng l\u00e0: $15-12=3V$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2725},{"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":"Mu\u1ed1n \u0111o c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua v\u1eadt d\u1eabn c\u1ea7n c\u00e1c d\u1ee5ng c\u1ee5 g\u00ec v\u00e0 m\u1eafc d\u1ee5ng c\u1ee5 \u0111\u00f3 v\u1edbi v\u1eadt c\u1ea7n \u0111o th\u1ebf n\u00e0o?","select":["A. \u0110i\u1ec7n k\u1ebf m\u1eafc song song v\u1edbi v\u1eadt c\u1ea7n \u0111o.","B. V\u00f4n k\u1ebf m\u1eafc n\u1ed1i ti\u1ebfp v\u1edbi v\u1eadt c\u1ea7n \u0111o.","C. Ampe k\u1ebf m\u1eafc n\u1ed1i ti\u1ebfp v\u1edbi v\u1eadt c\u1ea7n \u0111o.","D. Ampe k\u1ebf m\u1eafc song song v\u1edbi v\u1eadt c\u1ea7n \u0111o."],"hint":"","explain":"<span class='basic_left'>Mu\u1ed1n \u0111o c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua v\u1eadt d\u1eabn c\u1ea7n Ampe k\u1ebf m\u1eafc n\u1ed1i ti\u1ebfp v\u1edbi v\u1eadt c\u1ea7n \u0111o. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2726},{"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":"Mu\u1ed1n \u0111o hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u v\u1eadt d\u1eabn c\u1ea7n c\u00e1c d\u1ee5ng c\u1ee5 g\u00ec v\u00e0 m\u1eafc d\u1ee5ng c\u1ee5 \u0111\u00f3 v\u1edbi v\u1eadt c\u1ea7n \u0111o th\u1ebf n\u00e0o?","select":["A. \u0110i\u1ec7n k\u1ebf m\u1eafc n\u1ed1i ti\u1ebfp v\u1edbi v\u1eadt c\u1ea7n \u0111o.","B. Ampe k\u1ebf m\u1eafc song song v\u1edbi v\u1eadt c\u1ea7n \u0111o.","C. V\u00f4n k\u1ebf m\u1eafc n\u1ed1i ti\u1ebfp v\u1edbi v\u1eadt c\u1ea7n \u0111o.","D. V\u00f4n k\u1ebf m\u1eafc song song v\u1edbi v\u1eadt c\u1ea7n \u0111o."],"hint":"","explain":"<span class='basic_left'>Mu\u1ed1n \u0111o hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u v\u1eadt d\u1eabn c\u1ea7n V\u00f4n k\u1ebf m\u1eafc song song v\u1edbi v\u1eadt c\u1ea7n \u0111o.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2727},{"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 \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn m\u1ed9t hi\u1ec7u \u0111i\u1ec7n th\u1ebf 9V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n qua n\u00f3 l\u00e0 0,6A. N\u1ebfu hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn t\u0103ng l\u00ean \u0111\u1ebfn 15V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 l\u00e0:","select":["A. 1,2A","B. 1A ","C. 0,9A ","D. 1,8A"],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: $\\dfrac{9}{0,6}=\\dfrac{15}{I}$<br\/>V\u1eady c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua l\u00e0: <br\/>$I=\\dfrac{0,6\\times 15}{9}=1A$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2728},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai1/lv2/img\/h19.jpg'\/><\/center>Tr\u00ean h\u00ecnh 3 l\u00e0 \u0111\u1ed3 th\u1ecb bi\u1ec3u di\u1ec5n s\u1ef1 ph\u1ee5 thu\u1ed9c c\u1ee7a c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua m\u1ed9t d\u00e2y d\u1eabn v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y d\u1eabn \u0111\u00f3. D\u1ef1a v\u00e0o \u0111\u1ed3 th\u1ecb h\u00e3y cho bi\u1ebft th\u00f4ng tin n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 \u0111\u00fang?","select":["A. Khi hi\u1ec7u \u0111i\u1ec7n th\u1ebf U = 40V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n l\u00e0 3,2A.","B. Khi hi\u1ec7u \u0111i\u1ec7n th\u1ebf U = 10V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n l\u00e0 1A.","C. Khi hi\u1ec7u \u0111i\u1ec7n th\u1ebf U = 12V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n l\u00e0 0,8A.","D. Khi hi\u1ec7u \u0111i\u1ec7n th\u1ebf U = 32V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n l\u00e0 4A."],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: $\\dfrac{U}{I}=\\dfrac{20}{1,6}=12,5$<br\/>\u0110\u1ed1i chi\u1ebfu l\u1ea7n l\u01b0\u1ee3t v\u1edbi c\u00e1c \u0111\u00e1p \u00e1n ta th\u1ea5y ch\u1ec9 c\u00f3 \u0111\u00e1p \u00e1n A l\u00e0 ch\u00ednh x\u00e1c.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2729},{"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 d\u00e2y d\u1eabn \u0111\u01b0\u1ee3c m\u1eafc v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf 12V th\u00ec c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 l\u00e0 0,3A. N\u1ebfu gi\u1ea3m hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn \u0111i 4V th\u00ec d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y d\u1eabn khi c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n:","select":["A. gi\u1ea3m \u0111i 3 l\u1ea7n.","B. t\u0103ng 3 l\u1ea7n.","C. gi\u1ea3m \u0111i 0,2A.","D. l\u00e0 I = 0,2A."],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: $\\dfrac{12}{0,3}=\\dfrac{8}{I}$<br\/>V\u1eady c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y d\u1eabn l\u00e0:<br\/>$I=\\dfrac{8\\times 0,3}{12}=0,2A$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2730}],"lesson":{"save":0,"level":2}}