B\u00e0i 1 (trang 168 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Ch\u1ecdn ph\u00e1t bi\u1ec3u \u0111\u00fang:<\/span><\/p>\nA. Ch\u1ec9 c\u00f3 d\u00f2ng \u0111i\u1ec7n bap ha m\u1edbi t\u1ea1o \u0111\u01b0\u1ee3c t\u1eeb tr\u01b0\u1eddng quay.<\/p>\n
B. R\u00f4to c\u1ee7a \u0111\u1ed9ng c\u01a1 kh\u00f4ng \u0111\u1ed3ng b\u1ed9 quay v\u1edbi t\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a t\u1eeb tr\u01b0\u1eddng quay.<\/p>\n
C. T\u1eeb tr\u01b0\u1eddng quay trong \u0111\u1ed9ng c\u01a1 kh\u00f4ng \u0111\u1ed3ng b\u1ed9 lu\u00f4n thay \u0111\u1ed5i c\u1ea3 v\u1ec1 h\u01b0\u1edbng v\u00e0 tr\u1ecb s\u1ed1.<\/p>\n
D. T\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a \u0111\u1ed9ng c\u01a1 kh\u00f4ng \u0111\u1ed3ng b\u1ed9 ph\u1ee5 thu\u1ed9c v\u00e0o t\u1ed1c \u0111\u1ed9 quay c\u1ee7a t\u1eeb tr\u01b0\u1eddng v\u00e0 monen c\u1ea3n.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ch\u1ecdn D<\/p>\n
B\u00e0i 2 (trang 168 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y v\u1ec1 \u0111\u1ed9ng c\u01a1 kh\u00f4ng \u0111\u1ed3ng b\u1ed9 ba pha l\u00e0 sai?<\/span><\/p>\nA. Hai b\u1ed9 ph\u1eadn ch\u00ednh c\u1ee7a \u0111\u1ed9ng c\u01a1 l\u00e0 r\u00f4to v\u00e0 stato.<\/p>\n
B. B\u1ed9 ph\u1eadn t\u1ea1o ra t\u1eeb tr\u01b0\u1eddng quay l\u00e0 stato.<\/p>\n
C. Nguy\u00ean t\u1eafc ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u1ed9ng c\u01a1 ch\u1ec9 d\u1ef1 tr\u00ean t\u01b0\u01a1ng t\u00e1c t\u1eeb gi\u1eefa nam ch\u00e2m v\u00e0 d\u00f2ng \u0111i\u1ec7n.<\/p>\n
D. C\u00f3 th\u1ec3 ch\u1ebf t\u1ea1o \u0111\u1ed9ng c\u01a1 kh\u00f4ng \u0111\u1ed3ng b\u1ed9 bap ha v\u1edbi c\u00f4ng su\u1ea5t l\u1edbn.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ch\u1ecdn C<\/p>\n
B\u00e0i 3 (trang 168 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0M\u1ed9t \u0111\u1ed9ng c\u01a1 xoay chi\u1ec1u ti\u00eau th\u1ee5 c\u00f4ng su\u1ea5t 1,5kW v\u00e0 c\u00f3 hi\u1ec7u su\u1ea5t 80%. T\u00ednh c\u00f4ng c\u01a1 h\u1ecdc do \u0111\u1ed9ng c\u01a1 sinh ra trong 30 ph\u00fat.<\/span><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Theo gi\u1ea3 thi\u1ebft P = 1,5kW, H = 80%, t = 30 ph\u00fat.<\/p>\n
C\u00f4ng su\u1ea5t h\u1eefu \u00edch : Pi<\/sub>\u00a0= HP = 0,8.1500 = 1200 W.<\/p>\nC\u00f4ng c\u01a1 h\u1ecdc h\u1eefu \u00edch l\u00e0: A = Pi<\/sub>.t=2,16.106<\/sup>\u00a0J<\/p>\nB\u00e0i 4 (trang 168 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0M\u1ed9t \u0111\u1ed9ng c\u01a1 kh\u00f4ng \u0111\u1ed3ng b\u1ed9 ba pha m\u1eafc theo ki\u1ec3u h\u00ecnh sao v\u00e0o m\u1ea1ch ba pha c\u00f3 \u0111i\u1ec7n \u00e1p pha l\u00e0 220 V. C\u00f4ng su\u1ea5t \u0111i\u1ec7n c\u1ee7a \u0111\u1ed9ng c\u01a1 l\u00e0 5,7 kW; h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t c\u1ee7a \u0111\u1ed9ng c\u01a1 l\u00e0 0,85. T\u00ednh c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua m\u1ed7i cu\u1ed9n d\u00e2y c\u1ee7a \u0111\u1ed9ng c\u01a1.<\/span><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Gi\u1ea3 thi\u1ebft cho U = 220V, P = 5,7kW, H = 0,85. Ta c\u00f3:<\/p>\n
P = 3UIcos\u03c6<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-22.png\")
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C\u00c2U H\u1eceI C\u00e2u 1 (trang 167 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):\u00a0M\u00f4 t\u1ea3 thi\u1ebft b\u1ecb t\u1ea1o ra t\u1eeb tr\u01b0\u1eddng quay b\u1eb1ng d\u00f2ng \u0111i\u1ec7n ba pha. L\u1eddi gi\u1ea3i: Xem m\u1ee5c 1 s\u00e1ch gi\u00e1o khoa. C\u00e2u 2 (trang 167 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):\u00a0N\u00eau c\u1ea5u t\u1ea1o v\u00e0 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u1ed9ng c\u01a1 kh\u00f4ng \u0111\u1ed3ng b\u1ed9 ba […]<\/p>\n","protected":false},"author":3,"featured_media":25100,"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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