Tác dụng của dòng điện xoay chiều

Home Lớp 9 Khoa học tự nhiên 9 - sách kết nối tri thức Bài 15: Tác dụng của dòng điện xoay chiềuBài tập trung bình

{"common":{"save":0,"post_id":"8282","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9460","post_id":"8282","mon_id":"1159533","chapter_id":"1159664","question":"M\u1ed9t bóng \u0111èn ho\u1ea1t \u0111\u1ed9ng t\u1ed1t v\u1edbi dòng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u. Khi c\u1ea5p dòng \u0111i\u1ec7n xoay chi\u1ec1u cho bóng \u0111èn, bóng \u0111èn s\u1ebd:<\/p>","options":["A. Không sáng.","B. Sáng nh\u01b0ng \u0111\u1ed9 sáng thay \u0111\u1ed5i liên t\u1ee5c.","C. Sáng bình th\u01b0\u1eddng nh\u01b0 v\u1edbi dòng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u.","D. Sáng y\u1ebfu h\u01a1n so v\u1edbi khi dùng dòng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u."],"correct":"3","level":"2","hint":"","answer":"\u0110áp án: C. Sáng bình th\u01b0\u1eddng nh\u01b0 v\u1edbi dòng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u. Gi\u1ea3i thích: Dòng \u0111i\u1ec7n xoay chi\u1ec1u cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho bóng \u0111èn t\u01b0\u01a1ng t\u1ef1 nh\u01b0 dòng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u, mi\u1ec5n là giá tr\u1ecb hi\u1ec7u d\u1ee5ng c\u1ee7a dòng \u0111i\u1ec7n t\u01b0\u01a1ng \u0111\u01b0\u01a1ng.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-31 10:44:49","option_type":"txt","len":3},{"id":"9461","post_id":"8282","mon_id":"1159533","chapter_id":"1159664","question":"T\u1ea1i sao dòng \u0111i\u1ec7n xoay chi\u1ec1u có th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o t\u1eeb tr\u01b0\u1eddng bi\u1ebfn \u0111\u1ed5i trong máy bi\u1ebfn áp?<\/p>","options":["A. Vì dòng \u0111i\u1ec7n xoay chi\u1ec1u có tác d\u1ee5ng nhi\u1ec7t m\u1ea1nh.","B. Vì dòng \u0111i\u1ec7n xoay chi\u1ec1u có t\u1ea7n s\u1ed1 c\u1ed1 \u0111\u1ecbnh.","C. Vì dòng \u0111i\u1ec7n xoay chi\u1ec1u thay \u0111\u1ed5i chi\u1ec1u liên t\u1ee5c.","D. Vì dòng \u0111i\u1ec7n xoay chi\u1ec1u luôn có c\u01b0\u1eddng \u0111\u1ed9 l\u1edbn."],"correct":"3","level":"2","hint":"","answer":"\u0110áp án: C. Vì dòng \u0111i\u1ec7n xoay chi\u1ec1u thay \u0111\u1ed5i chi\u1ec1u liên t\u1ee5c. Gi\u1ea3i thích: Dòng \u0111i\u1ec7n xoay chi\u1ec1u liên t\u1ee5c \u0111\u1ed5i chi\u1ec1u, làm t\u1eeb tr\u01b0\u1eddng trong máy bi\u1ebfn áp thay \u0111\u1ed5i theo, giúp t\u1ea1o ra su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng c\u1ea3m \u1ee9ng trong cu\u1ed9n dây th\u1ee9 c\u1ea5p.  <\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-31 10:46:35","option_type":"txt","len":3},{"id":"9462","post_id":"8282","mon_id":"1159533","chapter_id":"1159664","question":"M\u1ed9t qu\u1ea1t \u0111i\u1ec7n ch\u1ea1y b\u1eb1ng dòng \u0111i\u1ec7n xoay chi\u1ec1u. N\u1ebfu t\u1ea7n s\u1ed1 c\u1ee7a dòng \u0111i\u1ec7n gi\u1ea3m, \u0111i\u1ec1u gì x\u1ea3y ra v\u1edbi t\u1ed1c \u0111\u1ed9 quay c\u1ee7a qu\u1ea1t?<\/p>","options":["A. T\u0103ng lên.","B. Gi\u1ea3m \u0111i.","C. Không thay \u0111\u1ed5i.","D. Ng\u1eebng quay."],"correct":"2","level":"2","hint":"","answer":"\u0110áp án: B. Gi\u1ea3m \u0111i. Gi\u1ea3i thích: T\u1ea7n s\u1ed1 c\u1ee7a dòng \u0111i\u1ec7n xoay chi\u1ec1u quy\u1ebft \u0111\u1ecbnh t\u1ed1c \u0111\u1ed9 thay \u0111\u1ed5i t\u1eeb tr\u01b0\u1eddng, t\u1eeb \u0111ó \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 quay c\u1ee7a \u0111\u1ed9ng c\u01a1 trong qu\u1ea1t.  <\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-31 10:48:06","option_type":"txt","len":2}]}