{"segment":[{"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":" N\u1ebfu d\u00f9ng quy t\u1eafc n\u1eafm tay ph\u1ea3i \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh chi\u1ec1u c\u1ee7a t\u1eeb tr\u01b0\u1eddng c\u1ee7a \u1ed1ng d\u00e2y c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua th\u00ec ng\u00f3n tay c\u00e1i cho\u00e3i ra ch\u1ec9 \u0111i\u1ec1u g\u00ec? ","select":["A. Chi\u1ec1u c\u1ee7a d\u00f2ng \u0111i\u1ec7n trong \u1ed1ng d\u00e2y.","B. Chi\u1ec1u c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb l\u00ean nam ch\u00e2m th\u1eed.","C. Chi\u1ec1u c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb t\u00e1c d\u1ee5ng l\u00ean c\u1ef1c B\u1eafc c\u1ee7a nam ch\u00e2m th\u1eed \u0111\u1eb7t \u1edf ngo\u00e0i \u1ed1ng d\u00e2y.","D. Chi\u1ec1u c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb t\u00e1c d\u1ee5ng l\u00ean c\u1ef1c B\u1eafc c\u1ee7a nam ch\u00e2m th\u1eed trong l\u00f2ng \u1ed1ng d\u00e2y."],"hint":"","explain":"<span class='basic_left'>N\u1ebfu d\u00f9ng quy t\u1eafc n\u1eafm tay ph\u1ea3i \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh chi\u1ec1u c\u1ee7a t\u1eeb tr\u01b0\u1eddng c\u1ee7a \u1ed1ng d\u00e2y c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua th\u00ec ng\u00f3n tay c\u00e1i cho\u00e3i ra ch\u1ec9:<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3371},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai39/lv2/img\/2.jpg'\/><\/center>H\u00ecnh sau m\u00f4 t\u1ea3 khung d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u01b0\u1ee3c \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng, trong \u0111\u00f3 khung quay \u0111ang c\u00f3 v\u1ecb tr\u00ed m\u00e0 m\u1eb7t ph\u1eb3ng khung vu\u00f4ng g\u00f3c v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb. V\u1ebd v\u1ecb tr\u00ed n\u00e0y c\u1ee7a khung d\u00e2y, \u00fd ki\u1ebfn n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 \u0111\u00fang? ","select":["A. Khung kh\u00f4ng ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb.","B. Khung ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb nh\u01b0ng n\u00f3 kh\u00f4ng quay.","C. Khung ti\u1ebfp t\u1ee5c quay do t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb l\u00ean khung.","D. Khung quay ti\u1ebfp m\u1ed9t ch\u00fat n\u1eefa nh\u01b0ng kh\u00f4ng ph\u1ea3i do t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb m\u00e0 do qu\u00e1n t\u00ednh."],"hint":"","explain":"<span class='basic_left'>Khung d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng th\u00ec c\u00f3 l\u1ef1c \u0111i\u1ec7n t\u1eeb t\u00e1c d\u1ee5ng l\u00ean n\u00f3. <br\/>Khung quay \u0111ang c\u00f3 v\u1ecb tr\u00ed m\u00e0 m\u1eb7t ph\u1eb3ng khung vu\u00f4ng g\u00f3c v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb(t\u1ee9c l\u00e0 m\u1eb7t ph\u1eb3ng khung n\u1eb1m trong m\u1eb7t ph\u1eb3ng trung h\u00f2a). th\u00ec L\u1ef1c \u0111i\u1ec7n t\u1eeb kh\u00f4ng l\u00e0m cho khung quay quanh tr\u1ee5c c\u1ee7a n\u00f3.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3372},{"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":"Cu\u1ed9n s\u01a1 c\u1ea5p c\u1ee7a m\u00e1y bi\u1ebfn th\u1ebf c\u00f3 4400 v\u00f2ng, cu\u1ed9n th\u1ee9 c\u1ea5p c\u00f3 240 v\u00f2ng. Khi \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u cu\u1ed9n s\u01a1 c\u1ea5p m\u1ed9t hi\u1ec7u \u0111i\u1ec7n th\u1ebf xoay chi\u1ec1u 220V th\u00ec \u1edf hai \u0111\u1ea7u d\u00e2y cu\u1ed9n th\u1ee9 c\u1ea5p c\u00f3 hi\u1ec7u \u0111i\u1ec7n th\u1ebf l\u00e0 bao nhi\u00eau ? ","select":["A. 12V","B. 24V","C. 36V","D. 6V"],"hint":"","explain":"<span class='basic_left'>\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c $\\dfrac{{{N}_{1}}}{{{N}_{2}}}=\\dfrac{{{U}_{1}}}{{{U}_{2}}}$ <br\/>suy ra hi\u1ec7u \u0111i\u1ec7n th\u1ebf c\u1ee7a cu\u1ed9n th\u1ee9 c\u1ea5p l\u00e0 ${{U}_{2}}=\\dfrac{{{U}_{1}}\\times {{N}_{2}}}{{{N}_{1}}}=\\dfrac{240\\times 220}{4400}=12V$. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3373},{"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\u1ed9t m\u00e1y bi\u1ebfn th\u1ebf c\u00f3 hi\u1ec7u \u0111i\u1ec7n th\u1ebf cu\u1ed9n s\u01a1 c\u1ea5p l\u00e0 220V, s\u1ed1 v\u00f2ng cu\u1ed9n s\u01a1 c\u1ea5p l\u00e0 500v\u00f2ng, hi\u1ec7u \u0111i\u1ec7n th\u1ebf cu\u1ed9n th\u1ee9 c\u1ea5p l\u00e0 110V. H\u1ecfi s\u1ed1 v\u00f2ng c\u1ee7a cu\u1ed9n th\u1ee9 c\u1ea5p l\u00e0 bao nhi\u00eau v\u00f2ng? ","select":["A. 125 v\u00f2ng","B. 250 v\u00f2ng","C. 450 v\u00f2ng","D. 300 v\u00f2ng"],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: ${{U}_{1}}=220$${{N}_{1}}=500$v\u00f2ng n\u1ebfu ${{U}_{2}}=110V$ ${{N}_{2}}=?$ <br\/>C\u00f4ng th\u1ee9c $\\dfrac{{{N}_{1}}}{{{N}_{2}}}=\\dfrac{{{U}_{1}}}{{{U}_{2}}}$ <br\/>Suy ra s\u1ed1 v\u00f2ng c\u1ee7a cu\u1ed9n th\u1ee9 c\u1ea5p l\u00e0 ${{N}_{2}}=\\dfrac{{{N}_{1}}\\times {{U}_{2}}}{{{U}_{1}}}=\\dfrac{500\\times 110}{220}=250$ v\u00f2ng<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3374},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai39/lv2/img\/5.jpg'\/><\/center>C\u00f3 hi\u1ec7n t\u01b0\u1ee3ng g\u00ec x\u1ea3y ra v\u1edbi mi\u1ebfng nam ch\u00e2m khi cho d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u ch\u1ea1y v\u00e0o nam ch\u00e2m \u0111i\u1ec7n \u1edf h\u00ecnh sau ? ","select":["A. Mi\u1ebfng nam ch\u00e2m b\u1ecb nam ch\u00e2m \u0111i\u1ec7n h\u00fat ch\u1eb7t.","B. Mi\u1ebfng nam ch\u00e2m b\u1ecb nam ch\u00e2m \u0111i\u1ec7n \u0111\u1ea9y ra.","C. Mi\u1ebfng nam ch\u00e2m \u0111\u1ee9ng y\u00ean, kh\u00f4ng b\u1ecb h\u00fat, kh\u00f4ng b\u1ecb \u0111\u1ea9y.","D. Mi\u1ebfng nam ch\u00e2m lu\u00e2n phi\u00ean b\u1ecb nam ch\u00e2m \u0111i\u1ec7n h\u00fat, \u0111\u1ea9y."],"hint":"","explain":"<span class='basic_left'>C\u00f3 hi\u1ec7n t\u01b0\u1ee3ng Mi\u1ebfng nam ch\u00e2m lu\u00e2n phi\u00ean b\u1ecb nam ch\u00e2m \u0111i\u1ec7n h\u00fat, \u0111\u1ea9y khi cho d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u ch\u1ea1y v\u00e0o nam ch\u00e2m \u0111i\u1ec7n \u1edf h\u00ecnh tr\u00ean<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3375},{"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":"Mu\u1ed1n truy\u1ec1n t\u1ea3i m\u1ed9t c\u00f4ng su\u1ea5t 2kW tr\u00ean d\u00e2y d\u1eabn c\u00f3 \u0111i\u1ec7n tr\u1edf 2\u2126 th\u00ec c\u00f4ng su\u1ea5t hao ph\u00ed tr\u00ean \u0111\u01b0\u1eddng d\u00e2y l\u00e0 bao nhi\u00eau? Cho bi\u1ebft hi\u1ec7u \u0111i\u1ec7n th\u1ebf tr\u00ean hai \u0111\u1ea7u d\u00e2y d\u1eabn l\u00e0 200V. ","select":["A. 200W.","B. 2000W.","C. 400W.","D. 4000W."],"hint":"","explain":"<span class='basic_left'>H\u01b0\u1edbng d\u1eabn: $I=\\dfrac{P}{U}=>{{P}_{hp}}={{I}^{2}}\\times R$ <br\/>T\u00ednh \u0111\u01b0\u1ee3c ${{P}_{hp}}=200W$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3376},{"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 nh\u00e0 m\u00e1y \u0111i\u1ec7n sinh ra m\u1ed9t c\u00f4ng su\u1ea5t 100000kW v\u00e0 c\u1ea7n truy\u1ec1n t\u1ea3i t\u1edbi n\u01a1i ti\u00eau th\u1ee5. Bi\u1ebft hi\u1ec7u su\u1ea5t truy\u1ec1n t\u1ea3i l\u00e0 90%. C\u00f4ng su\u1ea5t hao ph\u00ed tr\u00ean \u0111\u01b0\u1eddng truy\u1ec1n l\u00e0 ","select":["A. 10000kW.","B. 1000kW.","C. 100kW.","D. 10kW."],"hint":"","explain":"<span class='basic_left'>${{P}_{hp}}=10{\\scriptstyle{}^{0}\/{}_{0}}P=10{\\scriptstyle{}^{0}\/{}_{0}}\\times 100000kW=10000kW$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3377},{"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":"\u0110\u1ec3 n\u00e2ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf t\u1eeb U = 25000V l\u00ean \u0111\u00ea\u0301n hi\u1ec7u \u0111i\u1ec7n th\u1ebf U\u2019= 500000V, th\u00ec ph\u1ea3i d\u00f9ng m\u00e1y bi\u1ebfn th\u1ebf c\u00f3 ti\u0309 s\u1ed1 gi\u1eefa s\u1ed1 vo\u0300ng d\u00e2y c\u1ee7a cu\u1ed9n s\u01a1 c\u1ea5p v\u00e0 s\u1ed1 v\u00f2ng d\u00e2y c\u1ee7a cu\u1ed9n th\u1ee9 c\u1ea5p la\u0300 ","select":["A. 0,005.","B. 0,05. ","C. 0,5.","D. 5."],"hint":"","explain":"<span class='basic_left'>$\\dfrac{U}{{{U}^{'}}}=\\dfrac{N}{{{N}^{'}}}=\\dfrac{25000}{500000}=0,05$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3378},{"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\u00ea\u0309 s\u01b0\u0309 du\u0323ng thi\u00ea\u0301t bi\u0323 co\u0301 hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111i\u0323nh m\u01b0\u0301c 24V \u01a1\u0309 ngu\u00f4\u0300n \u0111i\u00ea\u0323n co\u0301 hi\u1ec7u \u0111i\u1ec7n th\u1ebf 220V pha\u0309i s\u01b0\u0309 du\u0323ng ma\u0301y bi\u00ea\u0301n th\u00ea\u0301 co\u0301 hai cu\u00f4\u0323n d\u00e2y v\u01a1\u0301i s\u00f4\u0301 vo\u0300ng d\u00e2y t\u01b0\u01a1ng \u01b0\u0301ng la\u0300 ","select":["A. s\u01a1 c\u00e2\u0301p 3458 vo\u0300ng, th\u01b0\u0301 c\u00e2\u0301p 380 vo\u0300ng.","B. s\u01a1 c\u00e2\u0301p 380 vo\u0300ng, th\u01b0\u0301 c\u00e2\u0301p 3458 vo\u0300ng.","C. s\u01a1 c\u00e2\u0301p 360 vo\u0300ng, th\u01b0\u0301 c\u00e2\u0301p 3300 vo\u0300ng. ","D. s\u01a1 c\u00e2\u0301p 3300 vo\u0300ng, th\u01b0\u0301 c\u00e2\u0301p 360 v\u00f2ng. "],"hint":"","explain":"<span class='basic_left'>\u00c1p d\u1ee5ng: $\\dfrac{{{U}_{^{1}}}}{{{U}_{2}}}=\\dfrac{{{N}_{1}}}{{{N}_{2}}}$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3379},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"V\u01a1\u0301i :${{N}_{1}}$ v\u00e0 ${{N}_{2}}$ l\u00e2\u0300n l\u01b0\u01a1\u0323t la\u0300 s\u00f4\u0301 vo\u0300ng d\u00e2y cu\u00f4\u0323n s\u01a1 c\u00e2\u0301p va\u0300 cu\u00f4\u0323n th\u01b0\u0301 c\u00e2\u0301p; ${{U}_{1}}$ v\u00e0 ${{U}_{2}}$ la\u0300 hi\u00ea\u0323u \u0111i\u00ea\u0323n th\u00ea\u0301 gi\u01b0\u0303a hai \u0111\u00e2\u0300u d\u00e2y cu\u00f4\u0323n s\u01a1 c\u00e2\u0301p va\u0300 cu\u00f4\u0323n th\u01b0\u0301 c\u00e2\u0301p c\u1ee7a m\u1ed9t m\u00e1y bi\u1ebfn th\u1ebf ta co\u0301 bi\u00ea\u0309u th\u01b0\u0301c kh\u00f4ng \u0111u\u0301ng la\u0300 ","select":["A. $\\dfrac{{{\\text{U}}_{\\text{1}}}}{{{\\text{U}}_{\\text{2}}}}=\\dfrac{{{N}_{\\text{1}}}}{{{N}_{\\text{2}}}}$. ","B. ${{U}_{1}}\\times {{N}_{1}}={{U}_{2}}\\times {{N}_{2}}$","C. U2 = $\\dfrac{{{\\text{U}}_{\\text{1}}}{{N}_{\\text{2}}}}{{{N}_{\\text{1}}}}$.","D. U1 = $\\dfrac{{{\\text{U}}_{2}}{{N}_{\\text{1}}}}{{{N}_{\\text{2}}}}$."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3380},{"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":"G\u1ecdi ${{N}_{1}}$;${{U}_{1}}$ l\u00e0 s\u1ed1 v\u00f2ng d\u00e2y v\u00e0 hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u01b0\u0303a hai \u0111\u1ea7u cu\u1ed9n s\u01a1 c\u1ea5p. G\u1ecdi ${{N}_{2}}$; ${{U}_{2}}$ l\u00e0 s\u1ed1 v\u00f2ng d\u00e2y v\u00e0 hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u01b0\u0303a hai \u0111\u1ea7u cu\u1ed9n th\u1ee9 c\u1ea5p c\u1ee7a m\u1ed9t m\u00e1y bi\u1ebfn th\u1ebf. H\u1ec7 th\u1ee9c \u0111\u00fang l\u00e0 ","select":["A. $\\dfrac{{{\\text{U}}_{\\text{1}}}}{{{\\text{U}}_{\\text{2}}}}=\\dfrac{{{N}_{\\text{1}}}}{{{N}_{\\text{2}}}}$.","B. ${{U}_{1}}\\times {{N}_{1}}={{U}_{2}}\\times {{N}_{2}}$","C. ${{U}_{1}}+{{U}_{2}}={{N}_{1}}+{{N}_{2}}$.","D. ${{U}_{1}}-{{U}_{2}}={{N}_{1}}-{{N}_{2}}$"],"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":3381},{"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":"\u0110\u1ec3 n\u00e2ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf t\u1eeb U = 25000V l\u00ean \u0111\u00ea\u0301n hi\u1ec7u \u0111i\u1ec7n th\u1ebf U\u2019= 500000V, th\u00ec ph\u1ea3i d\u00f9ng m\u00e1y bi\u1ebfn th\u1ebf c\u00f3 ti\u0309 s\u1ed1 gi\u1eefa s\u1ed1 vo\u0300ng d\u00e2y c\u1ee7a cu\u1ed9n s\u01a1 c\u1ea5p v\u00e0 s\u1ed1 v\u00f2ng d\u00e2y c\u1ee7a cu\u1ed9n th\u1ee9 c\u1ea5p la\u0300 ","select":["A. 0,005.","B. 0,05. ","C. 0,5.","D. 5."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3382},{"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":"Hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y cu\u1ed9n s\u01a1 c\u1ea5p va\u0300 cu\u1ed9n th\u1ee9 c\u1ea5p c\u1ee7a m\u1ed9t m\u00e1y bi\u1ebfn th\u1ebf l\u00e2\u0300n l\u01b0\u01a1\u0323t la\u0300 220V v\u00e0 12V. N\u1ebfu s\u00f4\u0301 vo\u0300ng d\u00e2y cu\u1ed9n s\u01a1 c\u1ea5p l\u00e0 440 vo\u0300ng, th\u00ec s\u00f4\u0301 vo\u0300ng d\u00e2y cu\u1ed9n th\u01b0\u0301 c\u1ea5p ","select":["A. 240 vo\u0300ng.","B. 60 vo\u0300ng.","C. 24 vo\u0300ng. ","D. 6 vo\u0300ng."],"hint":"","explain":"<span class='basic_left'>\u00c1p d\u1ee5ng: $\\dfrac{{{U}_{^{1}}}}{{{U}_{2}}}=\\dfrac{{{N}_{1}}}{{{N}_{2}}}$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3383},{"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\u00ea\u0309 s\u01b0\u0309 du\u0323ng thi\u00ea\u0301t bi\u0323 co\u0301 hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111i\u0323nh m\u01b0\u0301c 24V \u01a1\u0309 ngu\u00f4\u0300n \u0111i\u00ea\u0323n co\u0301 hi\u1ec7u \u0111i\u1ec7n th\u1ebf 220V pha\u0309i s\u01b0\u0309 du\u0323ng ma\u0301y bi\u00ea\u0301n th\u00ea\u0301 co\u0301 hai cu\u00f4\u0323n d\u00e2y v\u01a1\u0301i s\u00f4\u0301 vo\u0300ng d\u00e2y t\u01b0\u01a1ng \u01b0\u0301ng la\u0300 ","select":["A. s\u01a1 c\u00e2\u0301p 3458 vo\u0300ng, th\u01b0\u0301 c\u00e2\u0301p 380 vo\u0300ng.","B. s\u01a1 c\u00e2\u0301p 380 vo\u0300ng, th\u01b0\u0301 c\u00e2\u0301p 3458 vo\u0300ng.","C. s\u01a1 c\u00e2\u0301p 360 vo\u0300ng, th\u01b0\u0301 c\u00e2\u0301p 3300 vo\u0300ng.","D. s\u01a1 c\u00e2\u0301p 3300 vo\u0300ng, th\u01b0\u0301 c\u00e2\u0301p 360 vo\u0300ng."],"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":3384},{"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":"Ch\u1ecdn ph\u00e1t bi\u1ec3u \u0111\u00fang . Khi truy\u1ec1n t\u1ea3i \u0111i\u1ec7n n\u0103ng \u0111i xa b\u1eb1ng \u0111\u01b0\u1eddng d\u00e2y d\u1eabn ","select":["A. To\u00e0n b\u1ed9 \u0111i\u1ec7n n\u0103ng \u1edf n\u01a1i c\u1ea5p s\u1ebd truy\u1ec1n \u0111\u1ebfn n\u01a1i ti\u00eau th\u1ee5 ","B. C\u00f3 m\u1ed9t ph\u1ea7n \u0111i\u1ec7n n\u0103ng hao ph\u00ed do hi\u1ec7n t\u01b0\u1ee3ng t\u1ecfa nhi\u1ec7t tr\u00ean \u0111\u01b0\u1eddng d\u00e2y ","C. Hi\u1ec7u su\u1ea5t truy\u1ec1n t\u1ea3i l\u00e0 100 % ","D. Kh\u00f4ng c\u00f3 hao ph\u00ed do t\u1ecfa nhi\u1ec7t tr\u00ean \u0111\u01b0\u1eddng d\u00e2y"],"hint":"","explain":"<span class='basic_left'>A,C, D sai v\u00ec : Khi truy\u1ec1n t\u1ea3i \u0111i\u1ec7n n\u0103ng \u0111i xa b\u1eb1ng \u0111\u01b0\u1eddng d\u00e2y d\u1eabn s\u1ebd c\u00f3 m\u1ed9t ph\u1ea7n \u0111i\u1ec7n n\u0103ng hao ph\u00ed do hi\u1ec7n t\u01b0\u1ee3ng t\u1ecfa nhi\u1ec7t tr\u00ean \u0111\u01b0\u1eddng d\u00e2y<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3385},{"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":" Bi\u1ec3u th\u1ee9c n\u00e0o sau d\u00e2y t\u00ednh c\u00f4ng su\u1ea5t c\u1ee7a d\u00f2ng \u0111i\u1ec7n","select":["A. $P=\\dfrac{U}{I}$ ","B. P=IR","C. P=UI","D. $P=\\dfrac{I}{U}$ "],"hint":"","explain":"<span class='basic_left'>C\u00f4ng su\u1ea5t c\u1ee7a d\u00f2ng \u0111i\u1ec7n : P=UI<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3386},{"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":"Bi\u1ec3u th\u1ee9c n\u00e0o sau d\u00e2y t\u00ednh c\u00f4ng su\u1ea5t hao ph\u00ed ( c\u00f4ng su\u1ea5t t\u1ecfa nhi\u1ec7t) ","select":["A. ${{P}_{hp}}=I\\times R$","B. ${{P}_{hp}}=U\\times I$","C. ${{P}_{hp}}=\\dfrac{P\\times {{U}^{2}}}{R}$ ","D. ${{P}_{hp}}=\\dfrac{{{P}^{2}}\\times R}{{{U}^{2}}}$ "],"hint":"","explain":"<span class='basic_left'>C\u00f4ng su\u1ea5t hao ph\u00ed ( c\u00f4ng su\u1ea5t t\u1ecfa nhi\u1ec7t) ${{P}_{hp}}={{I}^{2}}\\times R=\\dfrac{{{P}^{2}}\\times R}{{{U}^{2}}}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3387},{"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":" Ch\u1ecdn ph\u00e1t bi\u1ec3u \u0111\u00fang khi n\u00f3i v\u1ec1 c\u00f4ng su\u1ea5t hao ph\u00ed tr\u00ean \u0111\u01b0\u1eddng d\u00e2y t\u1ea3i \u0111i\u1ec7n :","select":["A. C\u00f4ng su\u1ea5t hao ph\u00ed do t\u1ecfa nhi\u1ec7t tr\u00ean \u0111\u01b0\u1eddng d\u00e2y t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi b\u00ecnh ph\u01b0\u01a1ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u \u0111\u01b0\u1eddng d\u00e2y ","B. C\u00f4ng su\u1ea5t hao ph\u00ed do t\u1ecfa nhi\u1ec7t tr\u00ean \u0111\u01b0\u1eddng d\u00e2y t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi b\u00ecnh ph\u01b0\u01a1ng hi\u1ec7u \u0111i\u1ec7n th\u1ec3 \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u \u0111\u01b0\u1eddng d\u00e2y .","C. C\u00f4ng su\u1ea5t hao ph\u00ed do t\u1ecfa nhi\u1ec7t tr\u00ean \u0111\u01b0\u1eddng d\u00e2y t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u \u0111\u01b0\u1eddng d\u00e2y ","D . C\u00f4ng su\u1ea5t hao ph\u00ed do t\u1ecfa nhi\u1ec7t tr\u00ean \u0111\u01b0\u1eddng d\u00e2y t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ec3 \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u \u0111\u01b0\u1eddng d\u00e2y ."],"hint":"","explain":"<span class='basic_left'>C\u00f4ng su\u1ea5t hao ph\u00ed ( c\u00f4ng su\u1ea5t t\u1ecfa nhi\u1ec7t) <br\/>${{P}_{hp}}={{I}^{2}}\\times R=\\dfrac{{{P}^{2}}\\times R}{{{U}^{2}}}$ <br\/> C\u00f4ng su\u1ea5t hao ph\u00ed do t\u1ecfa nhi\u1ec7t tr\u00ean \u0111\u01b0\u1eddng d\u00e2y d\u1eabn t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi b\u00ecnh ph\u01b0\u01a1ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3388},{"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\u00f3 m\u1ea5y c\u00e1ch \u0111\u1ec3 gi\u1ea3m hao ph\u00ed tr\u00ean \u0111\u01b0\u1eddng d\u00e2y truy\u1ec1n t\u1ea3i \u0111i\u1ec7n n\u0103ng \u0111i xa ","select":["A.1","B.2","C.3","D.4"],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3389},{"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 xoay chi\u1ec1u xu\u1ea5t hi\u1ec7n trong cu\u1ed9n d\u00e2y d\u1eabn k\u00edn khi ","select":["A. cho nam ch\u00e2m n\u1eb1m y\u00ean trong l\u00f2ng cu\u1ed9n d\u00e2y.","B. cho nam ch\u00e2m quay tr\u01b0\u1edbc cu\u1ed9n d\u00e2y.","C. cho nam ch\u00e2m \u0111\u1ee9ng y\u00ean tr\u01b0\u1edbc cu\u1ed9n d\u00e2y.","D. \u0111\u1eb7t cu\u1ed9n d\u00e2y trong t\u1eeb tr\u01b0\u1eddng c\u1ee7a m\u1ed9t nam ch\u00e2m."],"hint":"","explain":"<span class='basic_left'> <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3390}],"lesson":{"save":0,"level":2}}