{"id":20000,"date":"2025-07-07T12:50:05","date_gmt":"2025-07-07T05:50:05","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=20000"},"modified":"2025-07-09T19:05:03","modified_gmt":"2025-07-09T12:05:03","slug":"giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/","title":{"rendered":"Gi\u1ea3i th\u00edch \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn, c\u00f4ng th\u1ee9c t\u00ednh &amp; b\u00e0i t\u1eadp th\u1ef1c h\u00e0nh"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#Dien_tro_cua_day_dan_la_gi\" >\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn l\u00e0 g\u00ec?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#Khang_chien_la_gi\" >Kh\u00e1ng chi\u1ebfn l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#Dien_tro_cua_day_dan_la_gi-2\" >\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn l\u00e0 g\u00ec?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#Dien_tro_cua_day_dan_la_gi-3\" >\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn l\u00e0 g\u00ec?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#Su_phu_thuoc_cua_dien_la_chieu_dai_cua_day_dan\" >S\u1ef1 ph\u1ee5 thu\u1ed9c c\u1ee7a \u0111i\u1ec7n l\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a d\u00e2y d\u1eabn<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#Su_phu_thuoc_cua_dien_vao_phan_day_dan\" >S\u1ef1 ph\u1ee5 thu\u1ed9c c\u1ee7a \u0111i\u1ec7n v\u00e0o ph\u1ea7n d\u00e2y d\u1eabn<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#Su_phu_thuoc_cua_dien_vao_vat_lieu_nhu_mot_day_dan\" >S\u1ef1 ph\u1ee5 thu\u1ed9c c\u1ee7a \u0111i\u1ec7n v\u00e0o v\u1eadt li\u1ec7u nh\u01b0 m\u1ed9t d\u00e2y d\u1eabn<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#Cong_thuc_tinh_toan_dien_tro_cua_day_dan\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#Cong_thuc_tinh_toan_dien_tro_day_theo_luat_om\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n \u0111i\u1ec7n tr\u1edf d\u00e2y theo lu\u1eadt \u00f4m<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#Cong_thuc_tinh_toan_dien_tro_day_dua_tren_cac_tham_so_cua_day\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n \u0111i\u1ec7n tr\u1edf d\u00e2y d\u1ef1a tr\u00ean c\u00e1c tham s\u1ed1 c\u1ee7a d\u00e2y<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#R_%CF%81ls\" >R = \u03c1.l\/s<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#Mat_do_suc_de_khang\" >M\u1ea5t do s\u1ee9c \u0111\u1ec1 kh\u00e1ng<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-dien-tro-cua-day-dan-cong-thuc-tinh-bai-tap-thuc-hanh\/#Tap_the_duc_de_ap_dung_luat_om_va_cong_thuc_khang_chien_cua_day_dan\" >T\u1eadp th\u1ec3 d\u1ee5c \u0111\u1ec3 \u00e1p d\u1ee5ng lu\u1eadt \u00f4m v\u00e0 c\u00f4ng th\u1ee9c kh\u00e1ng chi\u1ebfn c\u1ee7a d\u00e2y d\u1eabn<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p dir=\"ltr\">Kh\u00e1ng chi\u1ebfn l\u00e0 m\u1ed9t thu\u1eadt ng\u1eef quen thu\u1ed9c m\u00e0 h\u1ecd ph\u1ea3i nghe trong v\u1eadt l\u00fd. Nh\u01b0ng \u0111\u1ec3 gi\u1ea3i th\u00edch kh\u00e1i ni\u1ec7m v\u00e0 ph\u00e2n t\u00edch b\u1ea3n ch\u1ea5t c\u1ee7a kh\u00e1ng chi\u1ebfn, r\u1ea5t \u00edt ng\u01b0\u1eddi c\u00f3 th\u1ec3 gi\u1ea3i th\u00edch \u0111\u1ea7y \u0111\u1ee7. Trong b\u00e0i b\u00e1o ng\u00e0y h\u00f4m nay, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef s\u1ebd gi\u00fap h\u1ecd t\u00ecm hi\u1ec3u v\u1ec1 s\u1ef1 kh\u00e1ng c\u1ef1 c\u1ee7a nh\u1ea1c tr\u01b0\u1edfng, c\u00f4ng th\u1ee9c v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3 trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y.<\/p>\n<p>                                    <img decoding=\"async\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/image\/600x480.png\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dien_tro_cua_day_dan_la_gi\"><\/span>\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn l\u00e0 g\u00ec? <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tro-cua-day-dan-la-gi.jpg\" alt=\"\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">S\u1ef1 kh\u00e1ng c\u1ef1 c\u1ee7a nh\u1ea1c tr\u01b0\u1edfng xu\u1ea5t hi\u1ec7n h\u00e0ng ng\u00e0y xung quanh ch\u00fang ta v\u00e0 d\u01b0\u1eddng nh\u01b0 tr\u1edf th\u00e0nh m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu c\u1ee7a cu\u1ed9c s\u1ed1ng. \u0110i\u1ec7n gi\u00fap c\u1ea3n tr\u1edf, \u0111i\u1ec1u ch\u1ec9nh d\u00f2ng \u0111i\u1ec7n v\u00e0 \u0111\u1ea3m b\u1ea3o an to\u00e0n cho m\u1ecdi ng\u01b0\u1eddi trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y.<\/p>\n<p dir=\"ltr\">Tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 s\u1ef1 kh\u00e1ng c\u1ef1 c\u1ee7a d\u00e2y d\u1eabn, h\u00e3y t\u00ecm hi\u1ec3u v\u1ec1 \u0111\u1ecbnh ngh\u0129a c\u1ee7a kh\u00e1ng chi\u1ebfn tr\u01b0\u1edbc!<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Khang_chien_la_gi\"><\/span>Kh\u00e1ng chi\u1ebfn l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110i\u1ec7n tr\u1edf \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u00e0 m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng v\u1eadt l\u00fd. S\u1ed1 l\u01b0\u1ee3ng n\u00e0y t\u01b0\u1ee3ng tr\u01b0ng cho kh\u1ea3 n\u0103ng c\u1ea3n tr\u1edf d\u00f2ng \u0111i\u1ec7n l\u1edbn ho\u1eb7c nh\u1ecf c\u1ee7a d\u00e2y d\u1eabn. Ho\u1eb7c \u0111\u01a1n gi\u1ea3n l\u00e0 hi\u1ec3u, \u0111i\u1ec7n tr\u1edf l\u00e0 kh\u1ea3 n\u0103ng can thi\u1ec7p v\u00e0o d\u00f2ng \u0111i\u1ec7n c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u c\u1ee5 th\u1ec3. Trong cu\u1ed9c s\u1ed1ng, \u0111i\u1ec7n tr\u1edf \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n ch\u1ea3y qua m\u1ea1ch, \u0111i\u1ec1u ch\u1ec9nh m\u1ee9c t\u00edn hi\u1ec7u v\u00e0 chia \u0111i\u1ec7n \u00e1p.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dien_tro_cua_day_dan_la_gi-2\"><\/span>\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn l\u00e0 \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn \u0111\u00f3, kh\u00f4ng th\u00f4ng qua b\u1ea5t k\u1ef3 th\u00e0nh ph\u1ea7n n\u00e0o kh\u00e1c. \u0110i\u1ec7n tr\u1edf kh\u00e1c nhau trong m\u1ed7i v\u1eadt li\u1ec7u \u0111\u1ec3 t\u1ea1o ra c\u00e1c d\u00e2y kh\u00e1c nhau. C\u00f3 th\u1ec3 hi\u1ec3u r\u1eb1ng \u0111i\u1ec7n tr\u1edf d\u00e2y d\u1eabn ch\u1ec9 \u0111\u1eb7c tr\u01b0ng cho c\u00e1c thu\u1ed9c t\u00ednh c\u1ea3n tr\u1edf d\u00f2ng \u0111i\u1ec7n. <\/p>\n<p dir=\"ltr\">\u0110i\u1ec7n tr\u1edf n\u00e0y t\u1ef7 l\u1ec7 thu\u1eadn v\u1edbi chi\u1ec1u d\u00e0i c\u1ee7a d\u00e2y d\u1eabn v\u00e0 \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn. V\u00e0 ch\u00fang t\u1ef7 l\u1ec7 ngh\u1ecbch v\u1edbi ph\u1ea7n d\u00e2y. <\/p>\n<p dir=\"ltr\">Bi\u1ec3u t\u01b0\u1ee3ng s\u01a1 \u0111\u1ed3 c\u1ee7a \u0111i\u1ec7n tr\u1edf trong m\u1ea1ch:<\/p>\n<p dir=\"ltr\">\u0110i\u1ec7n tr\u1edf trong m\u1ea1ch \u0111\u01b0\u1ee3c k\u00fd hi\u1ec7u l\u00e0 s\u01a1 \u0111\u1ed3 nh\u01b0 trong h\u00ecnh sau:<\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tro-cua-day-dan-2.jpg\" alt=\"Bi\u1ec3u t\u01b0\u1ee3ng s\u01a1 \u0111\u1ed3 c\u1ee7a \u0111i\u1ec7n tr\u1edf trong m\u1ea1ch. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"800\" height=\"500\"><\/p>\n<p dir=\"ltr\">\u0110\u01a1n v\u1ecb \u0111i\u1ec7n tr\u1edf: <\/p>\n<p dir=\"ltr\">\u0110\u01a1n v\u1ecb c\u1ee7a \u0111i\u1ec7n tr\u1edf \u0111\u01b0\u1ee3c t\u00ednh trong m\u1ed9t \u0111\u01a1n v\u1ecb \u00f4m (k\u00fd hi\u1ec7u: \u03c9). Ngo\u00e0i ra, m\u1ecdi ng\u01b0\u1eddi c\u0169ng s\u1eed d\u1ee5ng b\u1ed9i s\u1ed1 c\u1ee7a nh\u1eefng c\u00e1i \u00f4m nh\u01b0: <\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Kilom (k\u03a9): \u200b\u200b1k\u03a9 = 1000\u03a9<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Mexico (M\u03a9): 1m\u03a9 = 1000000\u03a9<\/p>\n<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dien_tro_cua_day_dan_la_gi-3\"><\/span>\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn l\u00e0 g\u00ec? <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn ph\u1ee5 thu\u1ed9c v\u00e0o 3 y\u1ebfu t\u1ed1 bao g\u1ed3m: chi\u1ec1u d\u00e0i c\u1ee7a d\u00e2y d\u1eabn, ph\u1ea7n d\u00e2y d\u1eabn v\u00e0 v\u1eadt li\u1ec7u cho d\u00e2y d\u1eabn. T\u00ecm hi\u1ec3u c\u00e1c v\u00ed d\u1ee5 sau \u0111\u00e2y \u0111\u1ec3 ch\u1ee9ng minh r\u1eb1ng. <\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Su_phu_thuoc_cua_dien_la_chieu_dai_cua_day_dan\"><\/span>S\u1ef1 ph\u1ee5 thu\u1ed9c c\u1ee7a \u0111i\u1ec7n l\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a d\u00e2y d\u1eabn <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Khi b\u1ea1n c\u00f3 m\u1ed9t b\u00f3ng \u0111\u00e8n ng\u1eafn tr\u00ean m\u1ed9t d\u00e2y ng\u1eafn v\u1edbi \u0111i\u1ec7n \u00e1p kh\u00f4ng \u0111\u1ed5i, \u0111\u00e8n \u0111\u00e8n l\u00e0 b\u00ecnh th\u01b0\u1eddng, nh\u01b0ng n\u1ebfu \u0111\u01b0\u1ee3c thay th\u1ebf b\u1eb1ng d\u00e2y d\u00e0i h\u01a1n, v\u1eabn c\u00f3 c\u00f9ng m\u1ed9t m\u1eb7t c\u1eaft v\u00e0 \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb c\u00f9ng m\u1ed9t v\u1eadt li\u1ec7u, \u00e1nh s\u00e1ng s\u1ebd y\u1ebfu h\u01a1n. B\u1edfi v\u00ec t\u1ea1i th\u1eddi \u0111i\u1ec3m n\u00e0y, d\u00e2y d\u1eabn kh\u00e1 d\u00e0i c\u00f3 \u0111i\u1ec7n tr\u1edf l\u1edbn h\u01a1n d\u00e2y ban \u0111\u1ea7u.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Su_phu_thuoc_cua_dien_vao_phan_day_dan\"><\/span>S\u1ef1 ph\u1ee5 thu\u1ed9c c\u1ee7a \u0111i\u1ec7n v\u00e0o ph\u1ea7n d\u00e2y d\u1eabn <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">N\u1ebfu ch\u00fa \u00fd, h\u1ecd s\u1ebd nh\u1eadn th\u1ea5y r\u1eb1ng m\u1ed7i \u0111\u01b0\u1eddng d\u00e2y t\u1ea3i trong h\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n 500kV c\u1ee7a \u0111\u1ea5t n\u01b0\u1edbc ch\u00fang ta bao g\u1ed3m b\u1ed1n d\u00e2y song song v\u1edbi nhau. Ph\u1ea7n c\u1ee7a m\u1ed7i d\u00e2y n\u00e0y l\u00e0 373 mm2, do \u0111\u00f3, m\u1ed7i \u0111\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n s\u1ebd c\u00f3 t\u1ed5ng m\u1eb7t c\u1eaft ngang 373 mm2x4 = 1492 mm2. L\u00fd do m\u1ecdi ng\u01b0\u1eddi s\u1eed d\u1ee5ng m\u1ed9t s\u1ee3i d\u00e2y nh\u01b0 v\u1eady l\u00e0 \u0111\u1ec3 l\u00e0m cho \u0111i\u1ec7n tr\u1edf c\u1ee7a \u0111\u01b0\u1eddng t\u1ea3i nh\u1ecf h\u01a1n so v\u1edbi khi s\u1eed d\u1ee5ng d\u00e2y.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Su_phu_thuoc_cua_dien_vao_vat_lieu_nhu_mot_day_dan\"><\/span>S\u1ef1 ph\u1ee5 thu\u1ed9c c\u1ee7a \u0111i\u1ec7n v\u00e0o v\u1eadt li\u1ec7u nh\u01b0 m\u1ed9t d\u00e2y d\u1eabn <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">N\u01b0\u1edbc bi\u1ec3n c\u00f3 \u0111i\u1ec7n tr\u1edf kho\u1ea3ng 0,2\u03a9.M, trong khi n\u01b0\u1edbc u\u1ed1ng th\u01b0\u1eddng xuy\u00ean c\u00f3 \u0111i\u1ec7n tr\u1edf t\u1eeb 20\u03a9.M \u0111\u1ebfn 2000\u03a9.M. Do \u0111\u00f3, n\u01b0\u1edbc bi\u1ec3n s\u1ebd d\u1eabn \u0111i\u1ec7n t\u1ed1t h\u01a1n n\u01b0\u1edbc u\u1ed1ng b\u00ecnh th\u01b0\u1eddng t\u1eeb 100 \u0111\u1ebfn 10000 l\u1ea7n.<\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tro-cua-day-dan-3.jpg\" alt=\"\u0110i\u1ec7n tr\u1edf ph\u1ee5 thu\u1ed9c v\u00e0o chi\u1ec1u d\u00e0i, m\u1eb7t c\u1eaft ngang v\u00e0 v\u1eadt li\u1ec7u c\u1ee7a d\u00e2y d\u1eabn. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"800\" height=\"500\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_toan_dien_tro_cua_day_dan\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_toan_dien_tro_day_theo_luat_om\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n \u0111i\u1ec7n tr\u1edf d\u00e2y theo lu\u1eadt \u00f4m<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\" style=\"text-align: left\"><img loading=\"lazy\" decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/A%CC%89nh_chu%CC%A3p_Ma%CC%80n_hi%CC%80nh_2022-06-12_lu%CC%81c_11.07.13_CH.png\" alt=\"\" width=\"300\" height=\"115\"><\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u00f4i l\u00e0 ampe, \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng AMPE (Bi\u1ec3u t\u01b0\u1ee3ng A)<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">U l\u00e0 \u0111i\u1ec7n \u00e1p, \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng volt (k\u00fd hi\u1ec7u V)<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">R l\u00e0 m\u1ed9t \u0111i\u1ec7n tr\u1edf, m\u1ed9t d\u1ea3i \u00f4m (bi\u1ec3u t\u01b0\u1ee3ng)<\/p>\n<\/li>\n<\/ul>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_toan_dien_tro_day_dua_tren_cac_tham_so_cua_day\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n \u0111i\u1ec7n tr\u1edf d\u00e2y d\u1ef1a tr\u00ean c\u00e1c tham s\u1ed1 c\u1ee7a d\u00e2y                                   <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"R_%CF%81ls\"><\/span>                                                                                                                                                                                                                  R = \u03c1.l\/s<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">R l\u00e0 kh\u00e1ng thu\u1ed1c<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u03c1 l\u00e0 \u0111i\u1ec7n tr\u1edf ph\u1ee5 thu\u1ed9c v\u00e0o v\u1eadt li\u1ec7u<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">L l\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a d\u00e2y<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S l\u00e0 m\u1eb7t c\u1eaft c\u1ee7a d\u00e2y<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">\u0110i\u1ec7n tr\u1edf c\u1ee7a c\u00e1c d\u00e2y d\u1eabn c\u00f3 c\u00f9ng m\u1eb7t c\u1eaft v\u00e0 \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb c\u00f9ng lo\u1ea1i v\u1eadt li\u1ec7u s\u1ebd t\u1ef7 l\u1ec7 thu\u1eadn v\u1edbi chi\u1ec1u d\u00e0i c\u1ee7a d\u00e2y d\u1eabn. V\u00ed d\u1ee5, ch\u00fang ta c\u00f3 hai ph\u1ea7n c\u1ee7a d\u00e2y d\u1eabn 1 v\u00e0 2 v\u1edbi c\u00f9ng m\u1ed9t m\u1eb7t c\u1eaft, \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb c\u00f9ng lo\u1ea1i v\u1eadt li\u1ec7u, v\u1edbi chi\u1ec1u d\u00e0i L1, L2, ch\u00fang ta c\u00f3: Ch\u00fang ta c\u00f3:<\/p>\n<p dir=\"ltr\">R1\/R2 = L1\/L2<\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">R1, L1: \u0110i\u1ec7n tr\u1edf v\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a d\u00e2y d\u1eabn 1.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">R2, L2: \u0110i\u1ec7n tr\u1edf v\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a d\u00e2y 2.<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">\u0110i\u1ec7n tr\u1edf c\u1ee7a c\u00e1c d\u00e2y d\u1eabn c\u00f3 c\u00f9ng chi\u1ec1u d\u00e0i, \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb v\u1eadt li\u1ec7u, t\u1ef7 l\u1ec7 ngh\u1ecbch v\u1edbi m\u1eb7t c\u1eaft c\u1ee7a d\u00e2y d\u1eabn. V\u00ed d\u1ee5, ch\u00fang ta c\u00f3 hai d\u00e2y 1 v\u00e0 2 c\u00f3 c\u00f9ng chi\u1ec1u d\u00e0i, \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb c\u00f9ng lo\u1ea1i v\u1eadt li\u1ec7u v\u00e0 c\u00f3 m\u1eb7t c\u1eaft ngang c\u1ee7a S1 v\u00e0 S2, sau \u0111\u00f3:<\/p>\n<p dir=\"ltr\">R1\/R2 = S2\/S1<\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3: <\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">R1, S1: \u0110i\u1ec7n tr\u1edf v\u00e0 m\u1eb7t c\u1eaft ngang c\u1ee7a d\u00e2y 1.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">R2, S2: \u0110i\u1ec7n tr\u1edf v\u00e0 m\u1eb7t c\u1eaft ngang c\u1ee7a d\u00e2y d\u1eabn 2.<\/p>\n<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mat_do_suc_de_khang\"><\/span>M\u1ea5t do s\u1ee9c \u0111\u1ec1 kh\u00e1ng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Khi d\u00f2ng \u0111i\u1ec7n t\u00f4i ch\u1ea1y qua d\u00e2y d\u1eabn ho\u1eb7c d\u00e2y d\u1eabn c\u1ee7a b\u1ea5t k\u1ef3 \u0111i\u1ec7n tr\u1edf R n\u00e0o, c\u00f4ng su\u1ea5t \u0111i\u1ec7n n\u00e0y s\u1ebd \u0111\u01b0\u1ee3c chuy\u1ec3n th\u00e0nh m\u1ea5t nhi\u1ec7t sang m\u00f4i tr\u01b0\u1eddng, g\u00e2y m\u1ea5t n\u0103ng l\u01b0\u1ee3ng P.<\/p>\n<p dir=\"ltr\">\u0110\u1ec3 h\u1ea1n ch\u1ebf c\u00e1c t\u1ed5n th\u1ea5t g\u00e2y ra b\u1edfi \u0111i\u1ec7n tr\u1edf, trong qu\u00e1 tr\u00ecnh truy\u1ec1n \u0111i\u1ec7n, c\u00e1c k\u1ef9 s\u01b0 th\u01b0\u1eddng s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u nh\u01b0 m\u1ed9t d\u00e2y d\u1eabn c\u00f3 \u0111\u1ed9 d\u1eabn t\u1ed1t h\u01a1n, m\u1eb7t c\u1eaft d\u00e2y l\u1edbn h\u01a1n v\u00e0 \u0111i\u1ec7n \u00e1p cao h\u01a1n.<\/p>\n<p dir=\"ltr\">Xem th\u00eam: T\u00f3m t\u1eaft ki\u1ebfn \u200b\u200bth\u1ee9c li\u00ean quan \u0111\u1ebfn d\u00f2ng \u0111i\u1ec7n d\u1ec5 d\u00e0ng<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tap_the_duc_de_ap_dung_luat_om_va_cong_thuc_khang_chien_cua_day_dan\"><\/span>T\u1eadp th\u1ec3 d\u1ee5c \u0111\u1ec3 \u00e1p d\u1ee5ng lu\u1eadt \u00f4m v\u00e0 c\u00f4ng th\u1ee9c kh\u00e1ng chi\u1ebfn c\u1ee7a d\u00e2y d\u1eabn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">B\u00e0i 1 (Trang 32 S\u00e1ch gi\u00e1o khoa V\u1eadt l\u00fd 9): D\u00e2y d\u1eabn Nicrom d\u00e0i 30m, ph\u1ea7n 0,3mm2 b\u1ecb k\u1eb9t \u1edf \u0111i\u1ec7n \u00e1p 220V. T\u00ednh to\u00e1n c\u01b0\u1eddng \u0111\u1ed9 ch\u1ea3y qua d\u00e2y n\u00e0y.<\/p>\n<p dir=\"ltr\">B\u1ea3n t\u00f3m t\u1eaft:<\/p>\n<p dir=\"ltr\">D\u00e2y nicrom c\u00f3 \u200b\u200b\u03c1 = 1.1.10-6\u03a9.M; l = 30m; S = 0,3mm2 = 0.3.10-6m2; U = 220v;<\/p>\n<p dir=\"ltr\">I =?<\/p>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p:<\/p>\n<p dir=\"ltr\">\u0110i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn l\u00e0: <\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/A%CC%89nh_chu%CC%A3p_Ma%CC%80n_hi%CC%80nh_2022-06-12_lu%CC%81c_11.09.52_CH.png\" alt=\"\" width=\"300\" height=\"56\"><\/p>\n<p dir=\"ltr\">C\u01b0\u1eddng \u0111\u1ed9 ch\u1ea3y qua d\u00e2y l\u00e0<\/p>\n<p dir=\"ltr\">I = u\/r = 220\/110 = 2a<\/p>\n<p dir=\"ltr\">B\u00e0i 2 (trang 32 V\u1eadt l\u00fd SGK 9): M\u1ed9t b\u00f3ng \u0111\u00e8n khi s\u00e1ng h\u01a1n th\u00f4ng th\u01b0\u1eddng c\u00f3 \u0111i\u1ec7n tr\u1edf R1 = 7.5\u03a9 v\u00e0 d\u00f2ng \u0111i\u1ec7n ch\u1ea3y qua \u0111\u00e8n th\u00ec I = 0.6 A. B\u00f3ng \u0111\u00e8n n\u00e0y \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i n\u1ed1i ti\u1ebfp v\u1edbi \u0111i\u1ec7n tr\u1edf v\u00e0 ch\u00fang b\u1ecb d\u00ednh v\u00e0o \u0111i\u1ec7n \u00e1p u = 12V nh\u01b0 trong H\u00ecnh 11.1.<\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tro-cua-day-dan-4.jpg\" alt=\"\" width=\"300\" height=\"188\"><\/p>\n<p dir=\"ltr\">a) \u0110i\u1ec1u ch\u1ec9nh \u0111i\u1ec7n tr\u1edf c\u1ee7a \u0111i\u1ec7n tr\u1edf R2 th\u00e0nh b\u00f3ng \u0111\u00e8n b\u00ecnh th\u01b0\u1eddng l\u00e0 bao nhi\u00eau?<\/p>\n<p dir=\"ltr\">b) \u0110i\u1ec7n tr\u1edf n\u00e0y c\u00f3 \u0111i\u1ec7n tr\u1edf l\u1edbn nh\u1ea5t RB = 30\u03a9 v\u1edbi cu\u1ed9n d\u00e2y d\u1eabn \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng h\u1ee3p kim Nikelin v\u1edbi m\u1ed9t ph\u1ea7n S = 1mm2. T\u00ednh \u0111\u1ed9 d\u00e0i L c\u1ee7a d\u00e2y d\u1eabn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m \u0111i\u1ec7n tr\u1edf n\u00e0y.<\/p>\n<p dir=\"ltr\">B\u1ea3n t\u00f3m t\u1eaft:<\/p>\n<p dir=\"ltr\">RG = R1 = 7.5\u03a9 v\u00e0 id \u0110m = i = 0,6a; C\u00e1c bi\u1ebfn \u0111\u00e8n \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i; U = 12v<\/p>\n<p dir=\"ltr\">a) \u0110\u1ed1i v\u1edbi \u00e1nh s\u00e1ng b\u00ecnh th\u01b0\u1eddng, RB = R2 =?<\/p>\n<p dir=\"ltr\">B) RB Max = 30\u03a9, d\u00e2y Nikelin = 0.4.10-6\u03a9.M, s = 1mm2 = 1.10-6m2, l =?<\/p>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p:<\/p>\n<p dir=\"ltr\">\u0110\u1ed1i v\u1edbi b\u00f3ng \u0111\u00e8n b\u00ecnh th\u01b0\u1eddng, c\u01b0\u1eddng \u0111\u1ed9 hi\u1ec7n t\u1ea1i qua m\u1ea1ch ph\u1ea3i \u0111\u00fang 0,6 A. Khi \u0111i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ee7a m\u1ea1ch l\u00e0: <\/p>\n<p dir=\"ltr\">Rt\u0111 = ui = 120,6 = 20 \u03a9<\/p>\n<p dir=\"ltr\">Theo s\u01a1 \u0111\u1ed3 H\u00ecnh 11.1, RT\u0111 = R1 + R2<\/p>\n<p dir=\"ltr\">T\u1eeb \u0111\u00f3, t\u00ednh to\u00e1n R2 = RT\u0111 &#8211; R1 = 20 &#8211; 7.5 = 12,5\u03a9<\/p>\n<p dir=\"ltr\">b) t\u1eeb c\u00f4ng th\u1ee9c <\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/A%CC%89nh_chu%CC%A3p_Ma%CC%80n_hi%CC%80nh_2022-06-12_lu%CC%81c_11.12.12_CH.png\" alt=\"\" width=\"300\" height=\"81\"><\/p>\n<p dir=\"ltr\">B\u00e0i b\u00e1o tr\u00ean \u0111\u00e3 t\u1ed5ng h\u1ee3p \u0111\u1ea7y \u0111\u1ee7 c\u00e1c kh\u00e1i ni\u1ec7m v\u1ec1 \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn v\u00e0 c\u00f4ng th\u1ee9c c\u1ee7a s\u1ed1 l\u01b0\u1ee3ng v\u1eadt l\u00fd n\u00e0y. Hy v\u1ecdng, th\u00f4ng qua b\u00e0i vi\u1ebft b\u1ea1n c\u00f3 th\u1ec3 hi\u1ec3u v\u00e0 gi\u1ea3i th\u00edch s\u1ef1 kh\u00e1ng c\u1ef1 l\u00e0 g\u00ec? Nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ee9c \u0111\u1ec1 kh\u00e1ng? V\u00e0 c\u00f3 nh\u1eefng \u1ee9ng d\u1ee5ng h\u1eefu \u00edch trong th\u1ef1c t\u1ebf. <\/p>\n<p>Ngu\u1ed3n: <a href=\"http:\/\/www.ckconitsha.com\/vn\/\">http:\/\/www.ckconitsha.com\/vn\/<\/a> T\u00e1c gi\u1ea3: <a href=\"https:\/\/www.ckconitsha.com\/vn\/author\/nguyenlandung\">Nguy\u1ec5n L\u00e2n d\u0169ng<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kh\u00e1ng chi\u1ebfn l\u00e0 m\u1ed9t thu\u1eadt ng\u1eef quen thu\u1ed9c m\u00e0 h\u1ecd ph\u1ea3i nghe trong v\u1eadt l\u00fd. Nh\u01b0ng \u0111\u1ec3 gi\u1ea3i th\u00edch kh\u00e1i ni\u1ec7m v\u00e0 ph\u00e2n t\u00edch b\u1ea3n ch\u1ea5t c\u1ee7a kh\u00e1ng chi\u1ebfn, r\u1ea5t \u00edt ng\u01b0\u1eddi c\u00f3 th\u1ec3 gi\u1ea3i th\u00edch \u0111\u1ea7y \u0111\u1ee7. Trong b\u00e0i b\u00e1o ng\u00e0y h\u00f4m nay, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef s\u1ebd gi\u00fap h\u1ecd t\u00ecm&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[100],"tags":[],"class_list":["post-20000","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/20000","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/comments?post=20000"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/20000\/revisions"}],"predecessor-version":[{"id":25773,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/20000\/revisions\/25773"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=20000"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=20000"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=20000"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}