Đoạn mạch nối tiếp, song song

Home Lớp 9 Khoa học tự nhiên 9 - sách kết nối tri thức Bài 12: Đoạn mạch nối tiếp, song songBài tập trung bình

{"common":{"save":0,"post_id":"8247","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9386","post_id":"8247","mon_id":"1159533","chapter_id":"1159663","question":"M\u1ed9t \u0111o\u1ea1n m\u1ea1ch g\u1ed3m 2 \u0111i\u1ec7n tr\u1edf $R_1 = 5\\ \u03a9$<\/span> và $R_2 = 10\\ \u03a9$<\/span> m\u1eafc n\u1ed1i ti\u1ebfp. Dòng \u0111i\u1ec7n qua m\u1ea1ch là 2 A. Hi\u1ec7u \u0111i\u1ec7n th\u1ebf toàn m\u1ea1ch là:<\/p>","options":["A. 15 V","B. 20 V","C. 30 V","D. 40 V"],"correct":"3","level":"2","hint":"","answer":"\u0110áp án: C. 30 V<\/p>Gi\u1ea3i thích:<\/p>- \u0110i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ee7a m\u1ea1ch n\u1ed1i ti\u1ebfp:<\/p>$R = R_1 + R_2 = 5 + 10 = 15\\ \u03a9$<\/span><\/p>- Hi\u1ec7u \u0111i\u1ec7n th\u1ebf toàn m\u1ea1ch là: <\/p>$U = I.R = 2.15 = 30\\ V$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-27 22:54:19","option_type":"txt","len":0},{"id":"9387","post_id":"8247","mon_id":"1159533","chapter_id":"1159663","question":"M\u1ed9t \u0111o\u1ea1n m\u1ea1ch g\u1ed3m 2 \u0111i\u1ec7n tr\u1edf $R_1\\n\u200b\\n =4\\ \u03a9$<\/span> và $R_2 = 12\\ \u03a9$<\/span> m\u1eafc song song. \u0110i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ee7a \u0111o\u1ea1n m\u1ea1ch là:<\/p>","options":["A. 16 Ω","B. 3 Ω","C. 6 Ω","D. 2 Ω"],"correct":"2","level":"2","hint":"","answer":"\u0110áp án: B. 3 Ω<\/p>Gi\u1ea3i thích:<\/p>- \u0110i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ee7a m\u1ea1ch song song:<\/p>${1 \\over R} = {1 \\over R_1} + {1 \\over R_2} = {1 \\over 4} + {1 \\over 12} = {1 \\over 3}$<\/span><\/p>=> R = 3 Ω<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-27 23:00:02","option_type":"txt","len":1},{"id":"9388","post_id":"8247","mon_id":"1159533","chapter_id":"1159663","question":"M\u1ed9t m\u1ea1ch \u0111i\u1ec7n song song g\u1ed3m hai nhánh, m\u1ed7i nhánh có \u0111i\u1ec7n tr\u1edf $R_1 = 8\\ \u03a9$<\/span> và $R_2 = 16\\ \u03a9$<\/span>. Hi\u1ec7u \u0111i\u1ec7n th\u1ebf qua m\u1ea1ch là 24 V. Dòng \u0111i\u1ec7n qua m\u1ed7i nhánh l\u1ea7n l\u01b0\u1ee3t là:<\/p>","options":["A. 3 A và 1,5 A","B. 2 A và 1 A","C. 4 A và 2 A","D. 6 A và 3 A"],"correct":"1","level":"2","hint":"","answer":"\u0110áp án: A. 3 A và 1,5 A<\/p>Gi\u1ea3i thích:<\/p>- Dòng \u0111i\u1ec7n qua nhánh 1: $I_1 = {U \\over R_1} = { 24 \\over 8} = 3\\ A$<\/span><\/p>- Dòng \u0111i\u1ec7n qua nhánh 2: $I_2 = {U \\over R_2} = {24 \\over 16} = 1,5\\ A$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-27 23:11:26","option_type":"txt","len":2}]}