{"id":569222,"date":"2026-07-27T09:36:04","date_gmt":"2026-07-27T02:36:04","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=569222"},"modified":"2026-07-27T09:36:04","modified_gmt":"2026-07-27T02:36:04","slug":"dinh-luat-om-la-gi-cong-thuc-i-u-r-va-bai-tap-van-dung","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/dinh-luat-om-la-gi-cong-thuc-i-u-r-va-bai-tap-van-dung\/","title":{"rendered":"\u0110\u1ecbnh lu\u1eadt \u00d4m l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c I = U\/R v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng"},"content":{"rendered":"<p><strong>\u0110\u1ecbnh lu\u1eadt \u00d4m ph\u00e1t bi\u1ec3u r\u1eb1ng c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua m\u1ed9t \u0111o\u1ea1n d\u00e2y d\u1eabn t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u \u0111o\u1ea1n d\u00e2y v\u00e0 t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y, \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng c\u00f4ng th\u1ee9c I = U\/R.<\/strong> \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng \u0111\u1ecbnh lu\u1eadt c\u01a1 b\u1ea3n nh\u1ea5t c\u1ee7a ph\u1ea7n \u0111i\u1ec7n h\u1ecdc, thu\u1ed9c V\u1eadt l\u00fd l\u1edbp 9 v\u00e0 l\u1edbp 11. B\u00e0i vi\u1ebft n\u00e0y tr\u00ecnh b\u00e0y \u0111\u1ecbnh lu\u1eadt \u00d4m l\u00e0 g\u00ec, c\u00f4ng th\u1ee9c, \u00fd ngh\u0129a c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng, \u1ee9ng d\u1ee5ng v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft.<\/p>\n<h2>\u0110\u1ecbnh lu\u1eadt \u00d4m l\u00e0 g\u00ec?<\/h2>\n<p>\u0110\u1ecbnh lu\u1eadt \u00d4m (Ohm) do nh\u00e0 v\u1eadt l\u00fd ng\u01b0\u1eddi \u0110\u1ee9c Georg Ohm t\u00ecm ra, ph\u00e1t bi\u1ec3u: c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua m\u1ed9t \u0111o\u1ea1n d\u00e2y d\u1eabn t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u \u0111o\u1ea1n d\u00e2y v\u00e0 t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111i\u1ec7n tr\u1edf c\u1ee7a \u0111o\u1ea1n d\u00e2y \u0111\u00f3. Ngh\u0129a l\u00e0 hi\u1ec7u \u0111i\u1ec7n th\u1ebf c\u00e0ng l\u1edbn th\u00ec d\u00f2ng \u0111i\u1ec7n c\u00e0ng m\u1ea1nh, c\u00f2n \u0111i\u1ec7n tr\u1edf c\u00e0ng l\u1edbn th\u00ec d\u00f2ng \u0111i\u1ec7n c\u00e0ng y\u1ebfu.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-569403\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-1.jpg\" alt=\"dinh-luat-om-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00f4ng th\u1ee9c \u0111\u1ecbnh lu\u1eadt \u00d4m<\/h2>\n<p><strong>I = U \/ R<\/strong><\/p>\n<ul>\n<li>I: c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n (\u0111\u01a1n v\u1ecb ampe, A).<\/li>\n<li>U: hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u \u0111o\u1ea1n d\u00e2y (v\u00f4n, V).<\/li>\n<li>R: \u0111i\u1ec7n tr\u1edf c\u1ee7a \u0111o\u1ea1n d\u00e2y (\u00f4m, \u03a9).<\/li>\n<\/ul>\n<p>T\u1eeb c\u00f4ng th\u1ee9c n\u00e0y, ta suy ra: hi\u1ec7u \u0111i\u1ec7n th\u1ebf U = I \u00d7 R v\u00e0 \u0111i\u1ec7n tr\u1edf R = U \/ I. Ba c\u00f4ng th\u1ee9c n\u00e0y \u0111\u01b0\u1ee3c d\u00f9ng th\u01b0\u1eddng xuy\u00ean khi gi\u1ea3i b\u00e0i to\u00e1n v\u1ec1 m\u1ea1ch \u0111i\u1ec7n. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y t\u00f3m t\u1eaft ba \u0111\u1ea1i l\u01b0\u1ee3ng v\u00e0 c\u00e1ch suy ra t\u1eebng \u0111\u1ea1i l\u01b0\u1ee3ng khi bi\u1ebft hai \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f2n l\u1ea1i.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0110\u1ea1i l\u01b0\u1ee3ng<\/th>\n<th>K\u00fd hi\u1ec7u<\/th>\n<th>\u0110\u01a1n v\u1ecb<\/th>\n<th>C\u00f4ng th\u1ee9c t\u00ednh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n<\/td>\n<td>I<\/td>\n<td>ampe (A)<\/td>\n<td>I = U \/ R<\/td>\n<\/tr>\n<tr>\n<td>Hi\u1ec7u \u0111i\u1ec7n th\u1ebf<\/td>\n<td>U<\/td>\n<td>v\u00f4n (V)<\/td>\n<td>U = I \u00d7 R<\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec7n tr\u1edf<\/td>\n<td>R<\/td>\n<td>\u00f4m (\u03a9)<\/td>\n<td>R = U \/ I<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u00dd ngh\u0129a c\u1ee7a \u0111i\u1ec7n tr\u1edf<\/h2>\n<p>\u0110i\u1ec7n tr\u1edf (R) \u0111\u1eb7c tr\u01b0ng cho m\u1ee9c \u0111\u1ed9 c\u1ea3n tr\u1edf d\u00f2ng \u0111i\u1ec7n c\u1ee7a m\u1ed9t v\u1eadt d\u1eabn. \u0110i\u1ec7n tr\u1edf c\u00e0ng l\u1edbn th\u00ec c\u00e0ng c\u1ea3n tr\u1edf d\u00f2ng \u0111i\u1ec7n, khi\u1ebfn c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n qua v\u1eadt c\u00e0ng nh\u1ecf (khi c\u00f9ng m\u1ed9t hi\u1ec7u \u0111i\u1ec7n th\u1ebf). \u0110\u01a1n v\u1ecb c\u1ee7a \u0111i\u1ec7n tr\u1edf l\u00e0 \u00f4m (\u03a9); 1 \u03a9 l\u00e0 \u0111i\u1ec7n tr\u1edf c\u1ee7a \u0111o\u1ea1n d\u00e2y m\u00e0 khi \u0111\u1eb7t hi\u1ec7u \u0111i\u1ec7n th\u1ebf 1 V v\u00e0o hai \u0111\u1ea7u th\u00ec d\u00f2ng \u0111i\u1ec7n qua n\u00f3 l\u00e0 1 A.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-569404\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-2.jpg\" alt=\"dinh-luat-om-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>\u0110\u1ecbnh lu\u1eadt \u00d4m cho \u0111o\u1ea1n m\u1ea1ch<\/h2>\n<p>V\u1edbi \u0111o\u1ea1n m\u1ea1ch ch\u1ec9 c\u00f3 \u0111i\u1ec7n tr\u1edf, \u0111\u1ecbnh lu\u1eadt \u00d4m \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng tr\u1ef1c ti\u1ebfp I = U\/R. Trong \u0111o\u1ea1n m\u1ea1ch c\u00f3 nhi\u1ec1u \u0111i\u1ec7n tr\u1edf m\u1eafc n\u1ed1i ti\u1ebfp, \u0111i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng b\u1eb1ng t\u1ed5ng c\u00e1c \u0111i\u1ec7n tr\u1edf (R = R\u2081 + R\u2082 + \u2026). Trong \u0111o\u1ea1n m\u1ea1ch m\u1eafc song song, ngh\u1ecbch \u0111\u1ea3o \u0111i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng b\u1eb1ng t\u1ed5ng c\u00e1c ngh\u1ecbch \u0111\u1ea3o (1\/R = 1\/R\u2081 + 1\/R\u2082 + \u2026). Sau khi t\u00ednh \u0111i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng, ta \u00e1p d\u1ee5ng \u0111\u1ecbnh lu\u1eadt \u00d4m cho c\u1ea3 \u0111o\u1ea1n m\u1ea1ch.<\/p>\n<p>Trong \u0111o\u1ea1n m\u1ea1ch n\u1ed1i ti\u1ebfp, c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n qua m\u1ecdi \u0111i\u1ec7n tr\u1edf l\u00e0 nh\u01b0 nhau, c\u00f2n hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u01b0\u1ee3c chia cho t\u1eebng \u0111i\u1ec7n tr\u1edf theo t\u1ec9 l\u1ec7. Ng\u01b0\u1ee3c l\u1ea1i, trong \u0111o\u1ea1n m\u1ea1ch song song, hi\u1ec7u \u0111i\u1ec7n th\u1ebf tr\u00ean c\u00e1c nh\u00e1nh b\u1eb1ng nhau, c\u00f2n d\u00f2ng \u0111i\u1ec7n t\u1ed5ng b\u1eb1ng t\u1ed5ng d\u00f2ng \u0111i\u1ec7n qua t\u1eebng nh\u00e1nh. N\u1eafm r\u00f5 hai \u0111\u1eb7c \u0111i\u1ec3m n\u00e0y gi\u00fap b\u1ea1n ch\u1ecdn \u0111\u00fang c\u00f4ng th\u1ee9c khi ph\u00e2n t\u00edch m\u1ea1ch.<\/p>\n<h2>\u1ee8ng d\u1ee5ng c\u1ee7a \u0111\u1ecbnh lu\u1eadt \u00d4m<\/h2>\n<p>\u0110\u1ecbnh lu\u1eadt \u00d4m l\u00e0 n\u1ec1n t\u1ea3ng \u0111\u1ec3 ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf m\u1ecdi m\u1ea1ch \u0111i\u1ec7n: t\u00ednh d\u00f2ng \u0111i\u1ec7n, hi\u1ec7u \u0111i\u1ec7n th\u1ebf v\u00e0 \u0111i\u1ec7n tr\u1edf trong c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n; l\u1ef1a ch\u1ecdn \u0111i\u1ec7n tr\u1edf ph\u00f9 h\u1ee3p cho m\u1ea1ch; v\u00e0 b\u1ea3o \u0111\u1ea3m an to\u00e0n \u0111i\u1ec7n. \u0110\u00e2y l\u00e0 c\u00f4ng c\u1ee5 kh\u00f4ng th\u1ec3 thi\u1ebfu trong k\u1ef9 thu\u1eadt \u0111i\u1ec7n v\u00e0 \u0111i\u1ec7n t\u1eed, t\u1eeb m\u1ea1ch chi\u1ebfu s\u00e1ng d\u00e2n d\u1ee5ng \u0111\u1ebfn c\u00e1c bo m\u1ea1ch \u0111i\u1ec7n t\u1eed trong \u0111i\u1ec7n tho\u1ea1i v\u00e0 m\u00e1y t\u00ednh.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-569405\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-3.jpg\" alt=\"dinh-luat-om-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i<\/h2>\n<ul>\n<li><strong>B\u00e0i 1:<\/strong> M\u1ed9t \u0111o\u1ea1n d\u00e2y c\u00f3 \u0111i\u1ec7n tr\u1edf 10 \u03a9, \u0111\u1eb7t v\u00e0o hi\u1ec7u \u0111i\u1ec7n th\u1ebf 20 V. T\u00ednh c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n. <em>L\u1eddi gi\u1ea3i:<\/em> \u00c1p d\u1ee5ng I = U\/R = 20\/10 = 2 A. V\u1eady d\u00f2ng \u0111i\u1ec7n qua d\u00e2y l\u00e0 2 A.<\/li>\n<li><strong>B\u00e0i 2:<\/strong> D\u00f2ng \u0111i\u1ec7n 0,5 A ch\u1ea1y qua \u0111i\u1ec7n tr\u1edf 24 \u03a9. T\u00ednh hi\u1ec7u \u0111i\u1ec7n th\u1ebf. <em>L\u1eddi gi\u1ea3i:<\/em> \u00c1p d\u1ee5ng U = I \u00d7 R = 0,5 \u00d7 24 = 12 V. V\u1eady hi\u1ec7u \u0111i\u1ec7n th\u1ebf hai \u0111\u1ea7u \u0111i\u1ec7n tr\u1edf l\u00e0 12 V.<\/li>\n<li><strong>B\u00e0i 3:<\/strong> \u0110\u1eb7t hi\u1ec7u \u0111i\u1ec7n th\u1ebf 6 V v\u00e0o m\u1ed9t v\u1eadt d\u1eabn, d\u00f2ng \u0111i\u1ec7n qua n\u00f3 l\u00e0 0,3 A. T\u00ednh \u0111i\u1ec7n tr\u1edf. <em>L\u1eddi gi\u1ea3i:<\/em> \u00c1p d\u1ee5ng R = U\/I = 6\/0,3 = 20 \u03a9. V\u1eady \u0111i\u1ec7n tr\u1edf c\u1ee7a v\u1eadt d\u1eabn l\u00e0 20 \u03a9.<\/li>\n<li><strong>B\u00e0i 4:<\/strong> Hai \u0111i\u1ec7n tr\u1edf 3 \u03a9 v\u00e0 6 \u03a9 m\u1eafc n\u1ed1i ti\u1ebfp. T\u00ednh \u0111i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng. <em>L\u1eddi gi\u1ea3i:<\/em> V\u1edbi m\u1ea1ch n\u1ed1i ti\u1ebfp, R = R\u2081 + R\u2082 = 3 + 6 = 9 \u03a9.<\/li>\n<li><strong>B\u00e0i 5 (m\u1ea1ch n\u1ed1i ti\u1ebfp \u0111\u1ea7y \u0111\u1ee7):<\/strong> Hai \u0111i\u1ec7n tr\u1edf R\u2081 = 4 \u03a9 v\u00e0 R\u2082 = 8 \u03a9 m\u1eafc n\u1ed1i ti\u1ebfp v\u00e0o ngu\u1ed3n 12 V. T\u00ednh c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n trong m\u1ea1ch v\u00e0 hi\u1ec7u \u0111i\u1ec7n th\u1ebf tr\u00ean m\u1ed7i \u0111i\u1ec7n tr\u1edf. <em>L\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc:<\/em> (1) \u0110i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng: R = R\u2081 + R\u2082 = 4 + 8 = 12 \u03a9. (2) C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n: I = U\/R = 12\/12 = 1 A (d\u00f2ng \u0111i\u1ec7n qua m\u1ea1ch n\u1ed1i ti\u1ebfp l\u00e0 nh\u01b0 nhau). (3) Hi\u1ec7u \u0111i\u1ec7n th\u1ebf tr\u00ean R\u2081: U\u2081 = I \u00d7 R\u2081 = 1 \u00d7 4 = 4 V. (4) Hi\u1ec7u \u0111i\u1ec7n th\u1ebf tr\u00ean R\u2082: U\u2082 = I \u00d7 R\u2082 = 1 \u00d7 8 = 8 V. Ki\u1ec3m tra: U\u2081 + U\u2082 = 4 + 8 = 12 V, \u0111\u00fang b\u1eb1ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf ngu\u1ed3n.<\/li>\n<li><strong>B\u00e0i 6 (tr\u1eafc nghi\u1ec7m):<\/strong> C\u00f4ng th\u1ee9c \u0111\u1ecbnh lu\u1eadt \u00d4m l\u00e0 g\u00ec? A. U = I\/R B. I = U\/R C. R = I\u00b7U D. I = U\u00b7R. <em>\u0110\u00e1p \u00e1n:<\/em> B.<\/li>\n<\/ul>\n<h2>L\u01b0u \u00fd khi \u00e1p d\u1ee5ng \u0111\u1ecbnh lu\u1eadt \u00d4m<\/h2>\n<p>Khi gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng \u0111\u1ecbnh lu\u1eadt \u00d4m, c\u1ea7n ch\u00fa \u00fd: c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng ph\u1ea3i c\u00f9ng h\u1ec7 \u0111\u01a1n v\u1ecb (I t\u00ednh b\u1eb1ng ampe, U b\u1eb1ng v\u00f4n, R b\u1eb1ng \u00f4m); x\u00e1c \u0111\u1ecbnh r\u00f5 \u0111o\u1ea1n m\u1ea1ch \u0111ang x\u00e9t l\u00e0 m\u1ed9t \u0111i\u1ec7n tr\u1edf hay c\u1ea3 m\u1ea1ch; v\u1edbi m\u1ea1ch nhi\u1ec1u \u0111i\u1ec7n tr\u1edf, ph\u1ea3i t\u00ednh \u0111i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng tr\u01b0\u1edbc khi \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c. Ngo\u00e0i ra, \u0111\u1ecbnh lu\u1eadt \u00d4m \u00e1p d\u1ee5ng cho c\u00e1c v\u1eadt d\u1eabn kim lo\u1ea1i \u1edf nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng \u0111\u1ed5i; v\u1edbi m\u1ed9t s\u1ed1 linh ki\u1ec7n \u0111\u1eb7c bi\u1ec7t, m\u1ed1i quan h\u1ec7 gi\u1eefa I v\u00e0 U c\u00f3 th\u1ec3 kh\u00f4ng c\u00f2n tuy\u1ebfn t\u00ednh.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-569406\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-4.jpg\" alt=\"dinh-luat-om-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dinh-luat-om-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 \u0111\u1ecbnh lu\u1eadt \u00d4m<\/h2>\n<h3>\u0110\u1ecbnh lu\u1eadt \u00d4m ph\u00e1t bi\u1ec3u th\u1ebf n\u00e0o?<\/h3>\n<p>C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf v\u00e0 t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111i\u1ec7n tr\u1edf.<\/p>\n<h3>C\u00f4ng th\u1ee9c \u0111\u1ecbnh lu\u1eadt \u00d4m l\u00e0 g\u00ec?<\/h3>\n<p>I = U\/R, v\u1edbi I l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n, U l\u00e0 hi\u1ec7u \u0111i\u1ec7n th\u1ebf, R l\u00e0 \u0111i\u1ec7n tr\u1edf.<\/p>\n<h3>\u0110\u01a1n v\u1ecb c\u1ee7a \u0111i\u1ec7n tr\u1edf l\u00e0 g\u00ec?<\/h3>\n<p>L\u00e0 \u00f4m (\u03a9).<\/p>\n<h3>C\u00e1ch t\u00ednh hi\u1ec7u \u0111i\u1ec7n th\u1ebf theo \u0111\u1ecbnh lu\u1eadt \u00d4m?<\/h3>\n<p>U = I \u00d7 R, hi\u1ec7u \u0111i\u1ec7n th\u1ebf b\u1eb1ng c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n nh\u00e2n \u0111i\u1ec7n tr\u1edf.<\/p>\n<h3>\u0110i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ee7a \u0111o\u1ea1n m\u1ea1ch n\u1ed1i ti\u1ebfp t\u00ednh th\u1ebf n\u00e0o?<\/h3>\n<p>B\u1eb1ng t\u1ed5ng c\u00e1c \u0111i\u1ec7n tr\u1edf th\u00e0nh ph\u1ea7n: R = R\u2081 + R\u2082 + \u2026<\/p>\n<h3>\u0110\u1ecbnh lu\u1eadt \u00d4m c\u00f3 \u00e1p d\u1ee5ng cho m\u1ecdi v\u1eadt d\u1eabn kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng ho\u00e0n to\u00e0n. \u0110\u1ecbnh lu\u1eadt \u00d4m \u0111\u00fang v\u1edbi v\u1eadt d\u1eabn kim lo\u1ea1i \u1edf nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng \u0111\u1ed5i; v\u1edbi m\u1ed9t s\u1ed1 linh ki\u1ec7n nh\u01b0 \u0111i\u1ed1t, m\u1ed1i quan h\u1ec7 gi\u1eefa I v\u00e0 U kh\u00f4ng c\u00f2n tuy\u1ebfn t\u00ednh.<\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u0110\u1ecbnh lu\u1eadt \u00d4m ph\u00e1t bi\u1ec3u th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf v\u00e0 t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111i\u1ec7n tr\u1edf.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f4ng th\u1ee9c \u0111\u1ecbnh lu\u1eadt \u00d4m l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"I = U\/R, v\u1edbi I l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n, U l\u00e0 hi\u1ec7u \u0111i\u1ec7n th\u1ebf, R l\u00e0 \u0111i\u1ec7n tr\u1edf.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u0110\u01a1n v\u1ecb c\u1ee7a \u0111i\u1ec7n tr\u1edf l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"L\u00e0 \u00f4m (\u03a9).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00e1ch t\u00ednh hi\u1ec7u \u0111i\u1ec7n th\u1ebf theo \u0111\u1ecbnh lu\u1eadt \u00d4m?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"U = I nh\u00e2n R, hi\u1ec7u \u0111i\u1ec7n th\u1ebf b\u1eb1ng c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n nh\u00e2n \u0111i\u1ec7n tr\u1edf.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u0110i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ee7a \u0111o\u1ea1n m\u1ea1ch n\u1ed1i ti\u1ebfp t\u00ednh th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"B\u1eb1ng t\u1ed5ng c\u00e1c \u0111i\u1ec7n tr\u1edf th\u00e0nh ph\u1ea7n: R = R1 c\u1ed9ng R2 c\u1ed9ng ...\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u0110\u1ecbnh lu\u1eadt \u00d4m c\u00f3 \u00e1p d\u1ee5ng cho m\u1ecdi v\u1eadt d\u1eabn kh\u00f4ng?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Kh\u00f4ng ho\u00e0n to\u00e0n. \u0110\u1ecbnh lu\u1eadt \u00d4m \u0111\u00fang v\u1edbi v\u1eadt d\u1eabn kim lo\u1ea1i \u1edf nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng \u0111\u1ed5i; v\u1edbi m\u1ed9t s\u1ed1 linh ki\u1ec7n nh\u01b0 \u0111i\u1ed1t, m\u1ed1i quan h\u1ec7 gi\u1eefa I v\u00e0 U kh\u00f4ng c\u00f2n tuy\u1ebfn t\u00ednh.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>T\u00f3m l\u1ea1i, <strong>\u0111\u1ecbnh lu\u1eadt \u00d4m cho bi\u1ebft I = U\/R \u2013 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf v\u00e0 t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111i\u1ec7n tr\u1edf<\/strong>. N\u1eafm v\u1eefng c\u00f4ng th\u1ee9c v\u00e0 c\u00e1ch \u00e1p d\u1ee5ng cho \u0111o\u1ea1n m\u1ea1ch s\u1ebd gi\u00fap b\u1ea1n gi\u1ea3i t\u1ed1t c\u00e1c b\u00e0i to\u00e1n \u0111i\u1ec7n h\u1ecdc. \u0110\u1ec3 h\u1ecdc th\u00eam, m\u1eddi b\u1ea1n tham kh\u1ea3o c\u00e1c b\u00e0i c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf, c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 m\u1ed9t n\u0103m \u00e1nh s\u00e1ng b\u1eb1ng bao nhi\u00eau km tr\u00ean chuy\u00ean m\u1ee5c tin t\u1ee9c c\u1ee7a Ho\u00e0ng H\u00e0 Mobile.<\/p>\n<p>Xem th\u00eam:<\/p>\n<ul>\n<li><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-quat-tron\/\">Di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n: C\u00f4ng th\u1ee9c, C\u00e1ch t\u00ednh v\u00e0 \u1ee8ng d\u1ee5ng<\/a><\/li>\n<li><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-dien-tich-hinh-quat-tron\/\">H\u01b0\u1edbng D\u1eabn To\u00e0n Di\u1ec7n V\u1ec1 C\u00e1ch T\u00ednh Di\u1ec7n T\u00edch H\u00ecnh Qu\u1ea1t Tr\u00f2n<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u0110\u1ecbnh lu\u1eadt \u00d4m ph\u00e1t bi\u1ec3u r\u1eb1ng c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua m\u1ed9t \u0111o\u1ea1n d\u00e2y d\u1eabn t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u \u0111o\u1ea1n d\u00e2y v\u00e0 t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y, \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng c\u00f4ng th\u1ee9c I = U\/R. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng \u0111\u1ecbnh lu\u1eadt c\u01a1 b\u1ea3n [&hellip;]<\/p>\n","protected":false},"author":102,"featured_media":569407,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"\u0111\u1ecbnh lu\u1eadt \u00d4m","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"\u0110\u1ecbnh lu\u1eadt \u00d4m l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c I = U\/R, \u00fd ngh\u0129a c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft. Xem chi ti\u1ebft t\u1ea1i Ho\u00e0ng H\u00e0 Mobile.","footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-569222","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kham-pha","category-kien-thuc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>\u0110\u1ecbnh lu\u1eadt \u00d4m l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c I = U\/R v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng - Tin t\u1ee9c c\u00f4ng ngh\u1ec7 - HoangHaMobile<\/title>\n<meta name=\"description\" content=\"\u0110\u1ecbnh lu\u1eadt \u00d4m l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c I = U\/R, \u00fd ngh\u0129a c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft. Xem chi ti\u1ebft t\u1ea1i Ho\u00e0ng H\u00e0 Mobile.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dinh-luat-om-la-gi-cong-thuc-i-u-r-va-bai-tap-van-dung\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u0110\u1ecbnh lu\u1eadt \u00d4m l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c I = U\/R v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng\" \/>\n<meta property=\"og:description\" content=\"\u0110\u1ecbnh lu\u1eadt \u00d4m l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c I = U\/R, \u00fd ngh\u0129a c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft. 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