C\u00e2u 2 (trang 151 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Ch\u1ee9ng minh r\u1eb1ng c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u qua cu\u1ed9n c\u1ea3m thu\u1ea7n bi\u1ebfn thi\u00ean tr\u1ec5 pha \u03c0\/2 \u0111\u1ed1i v\u1edbi \u0111i\u1ec7n \u00e1p gi\u1eefa hai \u0111\u1ea7u cu\u1ed9n c\u1ea3m.<\/span><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Gi\u1ea3 s\u1eed c\u00f3 d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u i=I_0 cos\u03c9t (1) ch\u1ea1y qua m\u1ed9t cu\u1ed9n d\u00e2y thu\u1ea7n c\u1ea3m L. D\u00f2ng \u0111i\u1ec7n n\u00e0y bi\u1ebfn thi\u00ean \u0111i\u1ec1u h\u00f2a theo th\u1eddi gian n\u00ean n\u00f3 g\u00e2y ra trong cu\u1ed9n c\u1ea3m m\u1ed9t su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng t\u1ef1 c\u1ea3m:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-31.png\")
<\/p>\n
Theo \u0111\u1ecbnh lu\u1eadt \u00f4m \u0111i\u1ec7n \u00e1p gi\u1eefa hai \u0111\u1ea7u cu\u1ed9n c\u1ea3m l\u00e0:<\/p>\n
u = iR – e = -e (v\u00ec R = 0)<\/p>\n
V\u1eady:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/2-12.png\")
<\/p>\n
T\u1eeb (1), (3) ta nh\u1eadn th\u1ea5y c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u qua cu\u1ed9n c\u1ea3m thu\u1ea7n bi\u1ebfn thi\u00ean tr\u1ec5 pha \u03c0\/2 \u0111\u1ed1i v\u1edbi \u0111i\u1ec7n \u00e1p gi\u1eefa hai \u0111\u1ea7u cu\u1ed9n c\u1ea3m.<\/p>\n
B\u00c0I T\u1eacP<\/strong><\/p>\nB\u00e0i 1 (trang 151 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Do t\u0103ng dung kh\u00e1ng c\u1ee7a m\u1ed9t t\u1ee5 \u0111i\u1ec7n ph\u1eb3ng c\u00f3 \u0111i\u1ec7n m\u00f4i l\u00e0 kh\u00f4ng kh\u00ed, ta c\u1ea7n:<\/span><\/p>\nA. t\u0103ng t\u1ea7n s\u1ed1 c\u1ee7a \u0111i\u1ec7n \u00e1p \u0111\u1eb7t v\u00e0o hai b\u1ea3n t\u1ee5 \u0111i\u1ec7n.<\/p>\n
B. t\u0103ng kho\u1eb3ng c\u00e1ch gi\u1eefa hai b\u1ea3n t\u1ee5 \u0111i\u1ec7n.<\/p>\n
C. gi\u1ea3m \u0111i\u1ec7n \u00e1p hi\u1ec7u d\u1ee5ng gi\u1eefa hai b\u1ea3n t\u1ee5 \u0111i\u1ec7n.<\/p>\n
D. \u0111\u01b0a b\u1ea3n \u0111i\u1ec7n m\u00f4i v\u00e0o trong l\u00f2ng t\u1ee5 \u0111i\u1ec7n.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ch\u1ecdn B.<\/p>\n
Dung kh\u00e1ng c\u1ee7a t\u1ee5 Zc<\/sub>\u00a0= 1\/\u03c9C<\/p>\nM\u1eb7t kh\u00e1c \u0111i\u1ec7n dung t\u1ee5 ph\u1eb3ng l\u00e0:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-32.png\")
<\/p>\n
V\u1eady Zc<\/sub>\u00a0t\u0103ng khi d t\u0103ng.<\/p>\nB\u00e0i 2 (trang 151 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y \u0111\u00fang \u0111\u1ed1i v\u1edbi cu\u1ed9n c\u1ea3m?<\/span><\/p>\nA. cu\u1ed9n c\u1ea3m c\u00f3 t\u00e1c d\u1ee5ng c\u1ea3n tr\u1edf \u0111\u1ed1i v\u1edbi d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u, kh\u00f4ng c\u00f3 t\u00e1c d\u1ee5ng c\u1ea3n tr\u1edf d\u00f2ng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u.<\/p>\n
B. \u0111i\u1ec7n \u00e1p t\u1ee9c th\u1eddi gi\u1eefa hai \u0111\u1ea7u cu\u1ed9n c\u1ea3m thu\u1ea7n v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n qua n\u00f3 c\u00f3 th\u1ec3 \u0111\u1ed3ng th\u1eddi b\u1eb1ng m\u1ed9t n\u1eeda c\u00e1c bi\u00ean \u0111\u1ed9 t\u01b0\u01a1ng \u1ee9ng c\u1ee7a ch\u00fang.<\/p>\n
C. C\u1ea3m kh\u00e1ng c\u1ee7a m\u1ed9t cu\u1ed9n c\u1ea3m thu\u1ea7n t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi chu k\u00ec c\u1ee7a d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u.<\/p>\n
D. C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n qua cu\u1ed9n c\u1ea3m t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi t\u1ea7n s\u1ed1 d\u00f2ng \u0111i\u1ec7n.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ch\u1ecdn C<\/p>\n
\n
\n
B\u00e0i 3 (trang 152 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u qua \u0111o\u1ea1n m\u1ea1ch ch\u1ec9 c\u00f3 t\u1ee5 \u0111i\u1ec7n ho\u1eb7c ch\u1ec9 c\u00f3 cu\u1ed9n c\u1ea3m thu\u1ea7n gi\u1ed1ng nhau \u1edf ch\u1ed7:<\/span><\/p>\nA. \u0110\u1ec1u bi\u1ebfn thi\u00ean tr\u1ec5 pha \u03c0\/2 so v\u1edbi \u0111i\u1ec7n \u00e1p \u1edf hai \u0111\u1ea7u \u0111o\u1ea1n m\u1ea1ch.<\/p>\n
B. \u0110\u1ec1u c\u00f3 gi\u00e1 tr\u1ecb hi\u1ec7u d\u1ee5ng t\u1ec9 l\u1ec7 v\u1edbi \u0111i\u1ec7n \u00e1p hi\u1ec7u d\u1ee5ng gi\u1eefa hai \u0111\u1ea7u \u0111o\u1ea1n m\u1ea1ch.<\/p>\n
C. \u0110\u1ec1u c\u00f3 gi\u00e1 tr\u1ecb hi\u1ec7u d\u1ee5ng t\u0103ng khi t\u1ea7n s\u1ed1 d\u00f2ng \u0111i\u1ec7n t\u0103ng.<\/p>\n
D. \u0110\u1ec1u c\u00f3 gi\u00e1 tr\u1ecb hi\u1ec7u d\u1ee5ng gi\u1ea3m khi t\u1ea7n s\u1ed1 d\u00f2ng \u0111i\u1ec7n t\u0103ng.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ch\u1ecdn B.<\/p>\n
V\u00ec:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-33.png\")
<\/p>\n
Suy ra: c\u01b0\u1eddng \u0111\u1ed9 hi\u1ec7u d\u1ee5ng \u0111\u1ec1u t\u1ec9 l\u1ec7 v\u1edbi hi\u1ec7u \u0111i\u1ec7n \u00e1p hi\u1ec7u d\u1ee5ng.<\/p>\n
B\u00e0i 4 (trang 152 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0M\u1eafc t\u1ee5 \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n dung 2\u03bcF v\u00e0o m\u1ea1ng \u0111i\u1ec7n xoay chi\u1ec1u c\u00f3 \u0111i\u1ec7n \u00e1p 220V, t\u1ea7n s\u1ed1 50Hz. X\u00e1c \u0111\u1ecbnh c\u01b0\u1eddng \u0111\u1ed9 hi\u1ec7u d\u1ee5ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n qua t\u1ee5 \u0111i\u1ec7n.<\/span><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Dung kh\u00e1ng c\u1ee7a t\u1ee5 \u0111i\u1ec7n :<\/p>\n
![\"\u0110\u1ec3](\"http:\/\/vietjack.com\/giai-ly-12-nang-cao\/images\/bai-4-trang-152-sgk-vat-ly-12-nang-cao.PNG\")
<\/p>\n
\u00c1p d\u1ee5ng \u0111\u1ecbnh lu\u1eadt \u00f4m cho \u0111o\u1ea1n m\u1ea1ch c\u00f3 t\u1ee5 \u0111i\u1ec7n :<\/p>\n
![\"\u0110\u1ec3](\"http:\/\/vietjack.com\/giai-ly-12-nang-cao\/images\/bai-4-trang-152-sgk-vat-ly-12-nang-cao-1.PNG\")
<\/p>\n
B\u00e0i 5 (trang 152 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0\u0110i\u1ec7n \u00e1p gi\u1eefa hai b\u1ea3n t\u1ee5 \u0111i\u1ec7n c\u00f3 bi\u1ec3u th\u1ee9c:<\/span><\/p>\n![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-34.png\")
<\/p>\n
X\u00e1c \u0111\u1ecbnh c\u00e1c th\u1eddi \u0111i\u1ec3m m\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n qua t\u1ee5 \u0111i\u1ec7n b\u1eb1ng 0.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
V\u00ec d\u00f2ng \u0111i\u1ec7n s\u1edbm pha \u03c0\/2 \u0111\u1ed1i v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf n\u00ean c\u00f3 bi\u1ec3u th\u1ee9c:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/2-13.png\")
<\/p>\n
C\u00e1c th\u1eddi \u0111i\u1ec3m t c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n b\u1eb1ng 0 l\u00e0 nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/3-3.png\")
<\/p>\n
Suy ra:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/4-2.png\")
<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
C\u00c2U H\u1eceI C\u00e2u 1 (trang 151 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):\u00a0N\u00eau c\u00e1c t\u00e1c d\u1ee5ng ch\u00ednh c\u1ee7a t\u1ee5 \u0111i\u1ec7n \u0111\u1ed1i v\u1edbi d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u. L\u1eddi gi\u1ea3i: T\u00e1c d\u1ee5ng ch\u00ednh c\u1ee7a t\u1ee5 \u0111i\u1ec7n v\u1edbi d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u l\u00e0: + T\u1ea1o ra dung kh\u00e1ng c\u1ea3n tr\u1edf d\u00f2ng \u0111i\u1ec7n. + L\u00e0m cho \u0111i\u1ec7n \u00e1p bi\u1ebfn thi\u00ean […]<\/p>\n","protected":false},"author":3,"featured_media":25121,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1304],"tags":[1434,1433],"yoast_head":"\n
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