{"common":{"save":0,"post_id":"8283","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9665","post_id":"8283","mon_id":"1159533","chapter_id":"1159664","question":"<p>M\u1ed9t bóng \u0111èn \u0111\u01b0\u1ee3c m\u1eafc vào ngu\u1ed3n \u0111i\u1ec7n xoay chi\u1ec1u có \u0111i\u1ec7n áp hi\u1ec7u d\u1ee5ng U = 220 V. N\u1ebfu bóng \u0111èn tiêu th\u1ee5 công su\u1ea5t P = 100 W, thì \u0111i\u1ec7n tr\u1edf c\u1ee7a bóng \u0111èn là:<\/p>","options":["A. 44 Ω","B. 220 Ω","C. 484 Ω","D. 110 Ω"],"correct":"3","level":"3","hint":"","answer":"<p>\u0110áp án: C. 484 Ω<\/p><p>Gi\u1ea3i thích:<\/p><p>- Công su\u1ea5t tiêu th\u1ee5: <span class=\"math-tex\">$P = {U^2 \\over R} = {220^2 \\over 100} = 484\\ \u03a9$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2025-01-11 23:18:47","option_type":"txt","len":1},{"id":"9666","post_id":"8283","mon_id":"1159533","chapter_id":"1159664","question":"<p>M\u1ed9t thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n b\u1edfi ngu\u1ed3n xoay chi\u1ec1u U = 120 V và tiêu th\u1ee5 công su\u1ea5t P = 60 W. Tính c\u01b0\u1eddng \u0111\u1ed9 dòng \u0111i\u1ec7n hi\u1ec7u d\u1ee5ng qua thi\u1ebft b\u1ecb.<\/p>","options":["A. 0,5 A","B. 1 A","C. 2 A","D. 0,25 A"],"correct":"1","level":"3","hint":"","answer":"<p>\u0110áp án: A. 0,5 A<\/p><p>Gi\u1ea3i thích:<\/p><p>- Công su\u1ea5t tiêu th\u1ee5: <span class=\"math-tex\">$P=U.I=>I = {P \\over U}= {60 \\over 120}=0,5\\ A$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2025-01-11 23:21:42","option_type":"txt","len":0},{"id":"9667","post_id":"8283","mon_id":"1159533","chapter_id":"1159664","question":"<p>M\u1ed9t cu\u1ed9n dây có \u0111i\u1ec7n tr\u1edf R = 30 <span class=\"math-tex\">$\u03a9$<\/span> \u0111\u01b0\u1ee3c m\u1eafc vào ngu\u1ed3n \u0111i\u1ec7n xoay chi\u1ec1u có U = 120 V. Tính công su\u1ea5t tiêu th\u1ee5 c\u1ee7a cu\u1ed9n dây.<\/p>","options":["A. 240 W","B. 480 W","C. 600 W","D. 900 W"],"correct":"2","level":"3","hint":"","answer":"<p>\u0110áp án: B. 480 W<\/p><p>Gi\u1ea3i thích: <\/p><p>- Công su\u1ea5t tiêu th\u1ee5: <span class=\"math-tex\">$P = {U^2 \\over R} = {120^2 \\over 30}=480\\ W$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2025-01-11 23:24:52","option_type":"txt","len":0}]}