{"segment":[{"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\u01a1n v\u1ecb n\u00e0o d\u01b0\u1edbi \u0111\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 \u0111\u01a1n v\u1ecb c\u1ee7a \u0111i\u1ec7n n\u0103ng?","select":["A. Jun (J).","B. Niuton (N).","C. Kil\u00f4oat gi\u1edd (kW.h).","D. S\u1ed1 \u0111\u1ebfm c\u1ee7a c\u00f4ng t\u01a1 \u0111i\u1ec7n."],"hint":"","explain":"<span class='basic_left'>\u0110\u01a1n v\u1ecb c\u1ee7a \u0111i\u1ec7n n\u0103ng l\u00e0:<br\/>Jun (J) , Kil\u00f4oat gi\u1edd (kW.h) , S\u1ed1 \u0111\u1ebfm c\u1ee7a c\u00f4ng t\u01a1 \u0111i\u1ec7n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2891},{"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":"S\u1ed1 \u0111\u1ebfm c\u00f4ng t\u01a1 \u0111i\u1ec7n \u1edf gia \u0111\u00ecnh cho bi\u1ebft:","select":["A. Th\u1eddi gian s\u1eed d\u1ee5ng \u0111i\u1ec7n c\u1ee7a gia \u0111\u00ecnh.","B. C\u00f4ng su\u1ea5t \u0111i\u1ec7n m\u00e0 gia \u0111\u00ecnh s\u1eed d\u1ee5ng.","C. \u0110i\u1ec7n n\u0103ng m\u00e0 gia \u0111\u00ecnh \u0111\u00e3 s\u1eed d\u1ee5ng.","D. S\u1ed1 d\u1ee5ng c\u1ee5 v\u00e0 thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng."],"hint":"","explain":"<span class='basic_left'>S\u1ed1 \u0111\u1ebfm c\u00f4ng t\u01a1 \u0111i\u1ec7n \u1edf gia \u0111\u00ecnh cho bi\u1ebft: \u0111i\u1ec7n n\u0103ng m\u00e0 gia \u0111\u00ecnh \u0111\u00e3 s\u1eed d\u1ee5ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2892},{"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":"\u0110i\u1ec7n n\u0103ng \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng d\u1ee5ng c\u1ee5 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y?","select":["A. Ampe k\u1ebf.","B. C\u00f4ng t\u01a1 \u0111i\u1ec7n.","C. V\u00f4n k\u1ebf .","D. \u0110\u1ed3ng h\u1ed3 \u0111o \u0111i\u1ec7n v\u1ea1n n\u0103ng."],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec7n n\u0103ng \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng d\u1ee5ng c\u1ee5: c\u00f4ng t\u01a1 \u0111i\u1ec7n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2893},{"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 b\u00f3ng \u0111\u00e8n \u0111i\u1ec7n c\u00f3 ghi 220V-100W \u0111\u01b0\u1ee3c m\u1eafc v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf 220V. Bi\u1ebft \u0111\u00e8n n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trung b\u00ecnh 4 gi\u1edd trong 1 ng\u00e0y. \u0110i\u1ec7n n\u0103ng ti\u00eau th\u1ee5 c\u1ee7a b\u00f3ng \u0111\u00e8n n\u00e0y trong 30 ng\u00e0y l\u00e0 bao nhi\u00eau? ","select":["A. 12 kW.h.","B. 400 kW.h.","C. 1440 kW.h.","D. 43200 kW.h."],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec7n n\u0103ng ti\u00eau th\u1ee5 c\u1ee7a b\u00f3ng \u0111\u00e8n n\u00e0y trong 30 ng\u00e0y l\u00e0:<br\/>Ta c\u00f3: $A=P\\times t\\times 30=100\\times 4\\times 30=12000W.h=12kWh$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2894},{"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 gia \u0111\u00ecnh s\u1eed d\u1ee5ng \u0111\u00e8n chi\u1ebfu s\u00e1ng v\u1edbi c\u00f4ng su\u1ea5t t\u1ed5ng c\u1ed9ng l\u00e0 150W, trung b\u00ecnh m\u1ed7i ng\u00e0y trong 10 gi\u1edd; s\u1eed d\u1ee5ng t\u1ee7 l\u1ea1nh c\u00f3 c\u00f4ng su\u1ea5t 100W, trung b\u00ecnh m\u1ed7i ng\u00e0y trong 12 gi\u1edd v\u00e0 s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n th\u1ebf kh\u00e1c c\u00f3 c\u00f4ng su\u1ea5t t\u1ed5ng c\u1ed9ng l\u00e0 500W, trung b\u00ecnh m\u1ed7i ng\u00e0y trong 5 gi\u1edd.T\u00ednh \u0111i\u1ec7n n\u0103ng m\u00e0 gia \u0111\u00ecnh n\u00e0y s\u1eed d\u1ee5ng trong 30 ng\u00e0y.","select":["A. 75kW.h.","B. 45kW.h.","C. 120kW.h.","D. 156 kW.h."],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec7n n\u0103ng m\u00e0 gia \u0111inh s\u1eed d\u1ee5ng trong 30 ng\u00e0y:<br\/>\u0110\u00e8n chi\u1ebfu s\u00e1ng: ${{A}_{1}}={{P}_{1}}\\times {{t}_{1}}=0,15\\times 10\\times 30=45kWh$.<br\/>T\u1ee7 l\u1ea1nh: ${{A}_{2}}={{P}_{2}}\\times {{t}_{2}}=0,1\\times 12\\times 30=36kWh$<br\/>Thi\u1ebft b\u1ecb kh\u00e1c: ${{A}_{3}}={{P}_{3}}\\times {{t}_{3}}=0,5\\times 5\\times 30=75kWh$<br\/>suy ra $A={{A}_{1}}+{{A}_{2}}+{{A}_{3}}=45+36+75=156kWh$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2895},{"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 \u0111o\u1ea1n m\u1ea1ch c\u00f3 \u0111i\u1ec7n tr\u1edf R \u0111\u01b0\u1ee3c m\u1eafc v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf U th\u00ec d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 I v\u00e0 c\u00f4ng su\u1ea5t \u0111i\u1ec7n c\u1ee7a n\u00f3 l\u00e0 P. \u0110i\u1ec7n n\u0103ng m\u00e0 \u0111o\u1ea1n m\u1ea1ch n\u00e0y ti\u00eau th\u1ee5 trong th\u1eddi gian t \u0111\u01b0\u1ee3c t\u00ednh theo c\u00f4ng th\u1ee9c n\u00e0o d\u01b0\u1edbi \u0111\u00e2y?","select":["A. $A=\\dfrac{P\\times t}{R}$.","B. $A=RIt$.","C. $A=\\dfrac{{{P}^{2}}}{R}$.","D. $A=UIt$."],"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":2896},{"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 h\u1ed9 gia \u0111\u00ecnh s\u1eed d\u1ee5ng \u0111\u00e8n chi\u1ebfu s\u00e1ng v\u1edbi c\u00f4ng su\u1ea5t t\u1ed5ng c\u1ed9ng l\u00e0 150W, trung b\u00ecnh m\u1ed7i ng\u00e0y trong 10 gi\u1edd; s\u1eed d\u1ee5ng t\u1ee7 l\u1ea1nh c\u00f3 c\u00f4ng su\u1ea5t 100W, trung b\u00ecnh m\u1ed7i ng\u00e0y trong 12 gi\u1edd v\u00e0 s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n th\u1ebf kh\u00e1c c\u00f3 c\u00f4ng su\u1ea5t t\u1ed5ng c\u1ed9ng l\u00e0 500W, trung b\u00ecnh m\u1ed7i ng\u00e0y trong 5 gi\u1edd. T\u00ednh ti\u1ec1n \u0111i\u1ec7n m\u00e0 gia \u0111\u00ecnh n\u00e0y ph\u1ea3i tr\u1ea3 m\u1ed7i th\u00e1ng (30 ng\u00e0y), cho r\u1eb1ng gi\u00e1 ti\u1ec1n \u0111i\u1ec7n l\u00e0 1000 \u0111\u1ed3ng\/kW.h.","select":["A. 198000 \u0111\u1ed3ng.","B. 132000 \u0111\u1ed3ng.","C. 165000 \u0111\u1ed3ng.","D. 156000 \u0111\u1ed3ng."],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec7n n\u0103ng m\u00e0 gia \u0111\u00ecnh s\u1eed d\u1ee5ng trong 30 ng\u00e0y:<br\/>$A=(150\\times 10+100\\times 12+500\\times 5)\\times 30=1000W$ <br\/>Ti\u1ec1n \u0111i\u1ec7n m\u00e0 gia \u0111\u00ecnh n\u00e0y ph\u1ea3i tr\u1ea3:<br\/>$T=1000\\times A=1000\\times 156=156000$\u0111\u1ed3ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2897},{"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":"M\u1ed9t n\u1ed3i c\u01a1m \u0111i\u1ec7n c\u00f3 s\u1ed1 ghi tr\u00ean v\u1ecf l\u00e0 220V-400W \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf 220V, trung b\u00ecnh m\u1ed7i ng\u00e0y trong th\u1eddi gian 2 gi\u1edd. T\u00ednh c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y nung c\u1ee7a n\u1ed3i .","select":["A. 1,72A.","B. 1,59A.","C. 1,82A.","D. 1,45A."],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y nung c\u1ee7a n\u1ed3i:<br\/>$P=\\dfrac{{{U}^{2}}}{R}\\Rightarrow R=\\dfrac{{{U}^{2}}}{P}=\\dfrac{{{220}^{2}}}{400}121\\Omega $<br\/> C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y nung l\u00e0:<br\/>$P=U\\times I\\Rightarrow I=\\dfrac{P}{U}=\\dfrac{400}{220}=1,82A$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2898},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"M\u1ed9t n\u1ed3i c\u01a1m \u0111i\u1ec7n c\u00f3 s\u1ed1 ghi tr\u00ean v\u1ecf l\u00e0 220V-400W \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf 220V, trung b\u00ecnh m\u1ed7i ng\u00e0y trong th\u1eddi gian 2 gi\u1edd. T\u00ednh \u0111i\u1ec7n n\u0103ng m\u00e0 n\u1ed3i ti\u00eau th\u1ee5 trong 30 ng\u00e0y.","select":["A. 36kW.h","B. 20kW.h","C. 12kW.h","D. 24kW.h"],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y nung c\u1ee7a n\u1ed3i:<br\/>$P=\\dfrac{{{U}^{2}}}{R}\\Rightarrow R=\\dfrac{{{U}^{2}}}{P}=\\dfrac{{{220}^{2}}}{400}121\\Omega $<br\/>C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y nung l\u00e0:<br\/>$P=U\\times I\\Rightarrow I=\\dfrac{P}{U}=\\dfrac{400}{220}=1,82A$<br\/>\u0110i\u1ec7n n\u0103ng ti\u00eau th\u1ee5 trong 30 ng\u00e0y:<br\/>$A=UIt=220\\times 1,82\\times 30\\times 3600\\times 2=86486400(J)=24kwh$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2899},{"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":"Trong 30 ng\u00e0y, ch\u1ec9 s\u1ed1 c\u00f4ng t\u01a1 \u0111i\u1ec7n c\u1ee7a m\u1ed9t gia \u0111\u00ecnh t\u0103ng th\u00eam 90 s\u1ed1. Bi\u1ebft r\u1eb1ng th\u1eddi gian s\u1eed d\u1ee5ng \u0111i\u1ec7n trung b\u00ecnh m\u1ed7i ng\u00e0y l\u00e0 4 gi\u1edd, t\u00ednh c\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng trung b\u00ecnh c\u1ee7a gia \u0111\u00ecnh n\u00e0y.","select":["A. 750W.","B. 600W.","C. 720W.","D. 690W."],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: 90 s\u1ed1 = 90kW = 90000W<br\/>C\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng trung b\u00ecnh l\u00e0: $P=\\dfrac{90000}{30\\times 4}=750W$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2900},{"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":"Tr\u00ean m\u1ed9t b\u00f3ng \u0111\u00e8n c\u00f3 ghi 12V-6W. \u0110\u00e8n n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi \u0111\u00fang hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1ecbnh m\u1ee9c trong 1 gi\u1edd. H\u00e3y t\u00ednh \u0111i\u1ec7n tr\u1edf c\u1ee7a \u0111\u00e8n khi \u0111\u00f3.","select":["A. 25\u03a9.","B. 20\u03a9.","C. 24\u03a9.","D. 27\u03a9."],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec7n tr\u1edf c\u1ee7a \u0111\u00e8n l\u00e0: $P=\\dfrac{{{U}^{2}}}{R}\\Rightarrow R=\\dfrac{{{U}^{2}}}{P}=\\dfrac{{{12}^{2}}}{6}=24\\Omega $<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2901},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"M\u1ed9t b\u00f3ng \u0111\u00e8n c\u00f3 ghi 12V-6W. \u0110\u00e8n n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi \u0111\u00fang hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1ecbnh m\u1ee9c trong 1 gi\u1edd. T\u00ednh \u0111i\u1ec7n n\u0103ng m\u00e0 \u0111\u00e8n s\u1eed d\u1ee5ng ","select":["A. 20,2kJ.","B. 21,6kJ.","C. 24kJ.","D. 27kJ."],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec7n n\u0103ng m\u00e0 \u0111\u00e8n s\u1eed d\u1ee5ng trong 1 gi\u1edd l\u00e0: (1h = 3600s)<br\/>$P=\\dfrac{A}{t}\\Rightarrow A=P\\times t=6\\times 3600=21600J=21,6kJ$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2902},{"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 khu d\u00e2n c\u01b0 c\u00f3 500 h\u1ed9 gia \u0111\u00ecnh, trung b\u00ecnh m\u1ed7i h\u1ed9 s\u1eed d\u1ee5ng 4 gi\u1edd m\u1ed9t ng\u00e0y v\u1edbi c\u00f4ng su\u1ea5t \u0111i\u1ec7n 120W. T\u00ednh \u0111i\u1ec7n n\u0103ng m\u00e0 khu d\u00e2n c\u01b0 n\u00e0y s\u1eed d\u1ee5ng trong 30 ng\u00e0y.","select":["A. $2,862\\times {{10}^{10}}J$.","B. $2,764\\times {{10}^{10}}J$.","C. $2,345\\times {{10}^{10}}J$.","D. $2,592\\times {{10}^{10}}J$."],"hint":"","explain":"<span class='basic_left'>C\u00f4ng su\u1ea5t \u0111i\u1ec7n trung b\u00ecnh c\u1ee7a c\u1ea3 khu d\u00e2n c\u01b0 l\u00e0:<br\/>$P=4\\times 30\\times 500=60000\\text{W}=60kW$ .<br\/>\u0110i\u1ec7n n\u0103ng khu d\u00e2n c\u01b0 s\u1eed d\u1ee5ng trong 30 ng\u00e0y l\u00e0:<br\/>$A=P\\times t=60\\times 4\\times 30=720kWh=2,592\\times {{10}^{10}}J$. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2903},{"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\u1ec7n n\u0103ng c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a th\u00e0nh:","select":["A. Quang n\u0103ng.","B. C\u01a1 n\u0103ng.","C. Nhi\u1ec7t n\u0103ng.","D. C\u1ea3 3 ph\u01b0\u01a1ng \u00e1n."],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec7n n\u0103ng c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a th\u00e0nh c\u01a1 n\u0103ng (vd: qu\u1ea1t), quang n\u0103ng (vd: b\u00f3ng \u0111\u00e8n) v\u00e0 nhi\u1ec7t n\u0103ng (vd:b\u1ebfp \u0111i\u1ec7n).<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2904},{"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 ng\u01b0\u1eddi \u0111ang s\u1eed d\u1ee5ng b\u00f3ng \u0111\u00e8n tr\u00f2n d\u00e2y t\u00f3c 75W. Ng\u01b0\u1eddi n\u00e0y thay b\u1eb1ng b\u00f3ng \u0111\u00e8n \u1ed1ng 60W. Trung b\u00ecnh m\u1ed7i ng\u00e0y th\u1eafp s\u00e1ng 10h. S\u1ed1 \u0111\u1ebfm c\u1ee7a c\u00f4ng t\u01a1 gi\u1ea3m b\u1edbt bao nhi\u00eau m\u1ed7i th\u00e1ng? Cho 1 th\u00e1ng = 30 ng\u00e0y.","select":["A. 15kWh.","B. 4,5kWh.","C. M\u1ed9t \u0111\u00e1p s\u1ed1 kh\u00e1c.","D. 1,5kWh."],"hint":"","explain":"<span class='basic_left'>Ch\u00eanh l\u1ec7ch c\u00f4ng su\u1ea5t c\u1ee7a b\u00f3ng \u0111\u00e8n d\u00e2y t\u00f3c v\u00e0 s\u1ee3i \u0111\u1ed1t l\u00e0:<br\/>$\\Delta P={{P}_{1}}-{{P}_{2}}=75-60=15W$ <br\/>S\u1ed1 \u0111\u1ebfm c\u1ee7a c\u00f4ng t\u01a1 gi\u1ea3m b\u1edbt m\u1ed7i th\u00e1ng l\u00e0:<br\/>$15\\times 30\\times 10=4500Wh=4,5kWh$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2905},{"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":"X\u00e9t c\u00e1c bi\u1ec3u th\u1ee9c sau \u0111\u00e2y <br\/>(1) : UIt.<br\/>(2) : $\\dfrac{{{U}^{2}}}{R}\\times t$ <br\/>(3) : Uq.<br\/>C\u00e1c bi\u1ec3u th\u1ee9c t\u00ednh \u0111i\u1ec7n n\u0103ng n\u00e0o \u00e1p d\u1ee5ng cho m\u1ecdi \u0111o\u1ea1n m\u1ea1ch \u0111i\u1ec7n.","select":["A. (1) + (3).","B. (1) + (2).","C. (1) + (2) + (3).","D. (1)."],"hint":"","explain":"<span class='basic_left'>Bi\u1ec3u th\u1ee9c t\u00ednh \u0111i\u1ec7n n\u0103ng \u00e1p d\u1ee5ng cho m\u1ecdi \u0111o\u1ea1n m\u1ea1ch \u0111i\u1ec7n l\u00e0: A=UIt<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2906},{"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\u00f9ng b\u00e0n l\u00e0 tr\u00ean nh\u00e3n c\u00f3 ghi 220 V - 1000 W \u1edf hi\u1ec7u \u0111i\u1ec7n th\u1ebf 220 V th\u00ec \u0111i\u1ec7n n\u0103ng ti\u00eau th\u1ee5 trong m\u1ed7i ph\u00fat l\u00e0 :","select":["A. 1000 J.","B. 60 kJ.","C. 1000 W.","D. 60 kW."],"hint":"","explain":"<span class='basic_left'>\u0110i\u1ec7n \u00e1p s\u1eed d\u1ee5ng b\u1eb1ng \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c, v\u1eady b\u00e0n l\u00e0 ti\u00eau th\u1ee5 c\u00f4ng su\u1ea5t b\u1eb1ng c\u00f4ng su\u1ea5t \u0111\u1ecbnh m\u1ee9c.<br\/>\u0110i\u1ec7n n\u0103ng ti\u00eau th\u1ee5 m\u1ed7i ph\u00fat l\u00e0:<br\/> $A=1000\\times 60=60000Ws=60000J=60kJ$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2907},{"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 xay sinh t\u1ed1 c\u00f3 ghi: 220V - 100W \u0111\u01b0\u1ee3c d\u00f9ng \u1edf hi\u1ec7u \u0111i\u1ec7n th\u1ebf 220V. H\u00e3y t\u00ednh c\u00f4ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n sinh ra trong 5 ph\u00fat.","select":["A. 300J.","B. 30kJ.","C. 35kJ.","D. 3 000J."],"hint":"","explain":"<span class='basic_left'>V\u00ec m\u00e1y xay ho\u1ea1t \u0111\u1ed9ng \u1edf hi\u1ec7u \u0111i\u1ec7n th\u1ebf b\u1eb1ng v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1ecbnh m\u1ee9c n\u00ean c\u00f4ng su\u1ea5t c\u1ee7a m\u00e1y xay s\u1ebd b\u1eb1ng c\u00f4ng su\u1ea5t \u0111\u1ecbnh m\u1ee9c, n\u00ean $P=100W$<br\/>C\u00f4ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n sinh ra trong 5 ph\u00fat l\u00e0: $A=P\\times t=100\\times 5\\times 60=30000J$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2908},{"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 \u0111o c\u00f4ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n l\u00e0:","select":["A. C\u1ea3 (1) v\u00e0 (2) \u0111\u00fang.","B. Jun, kil\u00f4jun ... (1).","C. Ampe, v\u00f4n ... (3).","D. O\u00e1t gi\u00e2y, o\u00e1t gi\u1edd, kil\u00f4oat gi\u1edd, ... (2)."],"hint":"","explain":"<span class='basic_left'>\u0110\u01a1n v\u1ecb \u0111o c\u00f4ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n l\u00e0 Jun, kil\u00f4jun ho\u1eb7c o\u00e1t gi\u00e2y, o\u00e1t gi\u1edd, kil\u00f4oat gi\u1edd. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2909},{"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 qu\u1ea1t \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng, \u0111i\u1ec7n n\u0103ng \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng ch\u00ednh n\u00e0o?","select":["A. Quang n\u0103ng .","B. C\u1ea3 (1) v\u00e0 (2) \u0111\u1ec1u \u0111\u00fang.","C. C\u01a1 n\u0103ng (2).","D. Nhi\u1ec7t n\u0103ng (1)."],"hint":"","explain":"<span class='basic_left'>Khi qu\u1ea1t \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng, c\u00e1nh qu\u1ea1t quay, \u0111i\u1ec7n n\u0103ng \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh c\u01a1 n\u0103ng l\u00e0 ch\u00ednh, ngo\u00e0i ra c\u00f2n c\u00f3 nhi\u1ec7t n\u0103ng do \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn l\u00e0m qu\u1ea1t n\u00f3ng v\u00e0 quang n\u0103ng c\u1ee7a \u0111\u00e8n b\u00e1o, nh\u01b0ng hai d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng n\u00e0y r\u1ea5t \u00edt, ch\u1ee7 y\u1ebfu l\u00e0 c\u01a1 n\u0103ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2910}],"lesson":{"save":0,"level":2}}