{"id":495762,"date":"2025-10-09T19:42:41","date_gmt":"2025-10-09T12:42:41","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=495762"},"modified":"2025-10-09T19:42:41","modified_gmt":"2025-10-09T12:42:41","slug":"cong-thuc-tinh-dien-tro","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-dien-tro\/","title":{"rendered":"C\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf l\u00e0 g\u00ec? \u0110\u1ecbnh lu\u1eadt Ohm v\u00e0 c\u00e1ch \u0111\u1ecdc \u0111i\u1ec7n tr\u1edf"},"content":{"rendered":"<p data-start=\"251\" data-end=\"991\">Trong l\u0129nh v\u1ef1c \u0111i\u1ec7n h\u1ecdc, \u0111i\u1ec7n tr\u1edf l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n nh\u01b0ng v\u00f4 c\u00f9ng quan tr\u1ecdng, xu\u1ea5t hi\u1ec7n trong h\u1ea7u h\u1ebft c\u00e1c m\u1ea1ch \u0111i\u1ec7n t\u1eeb \u0111\u01a1n gi\u1ea3n \u0111\u1ebfn ph\u1ee9c t\u1ea1p. Vi\u1ec7c hi\u1ec3u r\u00f5 <strong>c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf<\/strong> kh\u00f4ng ch\u1ec9 gi\u00fap ng\u01b0\u1eddi h\u1ecdc n\u1eafm v\u1eefng nguy\u00ean l\u00fd d\u00f2ng \u0111i\u1ec7n m\u00e0 c\u00f2n l\u00e0 n\u1ec1n t\u1ea3ng \u0111\u1ec3 thi\u1ebft k\u1ebf, s\u1eeda ch\u1eefa v\u00e0 t\u1ed1i \u01b0u h\u1ec7 th\u1ed1ng \u0111i\u1ec7n trong th\u1ef1c t\u1ebf. B\u00ean c\u1ea1nh \u0111\u00f3, \u0111\u1ecbnh lu\u1eadt Ohm, m\u1ed9t trong nh\u1eefng \u0111\u1ecbnh lu\u1eadt v\u1eadt l\u00fd n\u1ed5i ti\u1ebfng nh\u1ea5t, c\u0169ng \u0111\u00f3ng vai tr\u00f2 ch\u1ee7 ch\u1ed1t trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 gi\u1eefa hi\u1ec7u \u0111i\u1ec7n th\u1ebf, c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n v\u00e0 \u0111i\u1ec7n tr\u1edf.<\/p>\n<h2 data-start=\"293\" data-end=\"338\"><strong data-start=\"296\" data-end=\"338\">L\u00fd thuy\u1ebft v\u1ec1 \u0111i\u1ec7n tr\u1edf v\u00e0 \u0111\u1ecbnh lu\u1eadt Ohm<\/strong><\/h2>\n<p data-start=\"1045\" data-end=\"1348\">Tr\u01b0\u1edbc khi \u0111i s\u00e2u v\u00e0o c\u00e1c c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf, b\u1ea1n c\u1ea7n hi\u1ec3u r\u00f5 b\u1ea3n ch\u1ea5t c\u1ee7a \u0111i\u1ec7n tr\u1edf v\u00e0 quy lu\u1eadt c\u01a1 b\u1ea3n chi ph\u1ed1i m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng \u0111i\u1ec7n trong m\u1ea1ch, \u0111\u00f3 ch\u00ednh l\u00e0 \u0111\u1ecbnh lu\u1eadt Ohm. Hai kh\u00e1i ni\u1ec7m n\u00e0y l\u00e0 n\u1ec1n t\u1ea3ng \u0111\u1ec3 t\u00ednh to\u00e1n, thi\u1ebft k\u1ebf v\u00e0 ch\u1ea9n \u0111o\u00e1n ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ea5t k\u1ef3 m\u1ea1ch \u0111i\u1ec7n n\u00e0o.<\/p>\n<h3 data-start=\"340\" data-end=\"363\"><strong data-start=\"344\" data-end=\"363\">\u0110i\u1ec7n tr\u1edf l\u00e0 g\u00ec?<\/strong><\/h3>\n<p data-start=\"365\" data-end=\"666\">\u0110i\u1ec7n tr\u1edf l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng v\u1eadt l\u00fd \u0111\u1eb7c tr\u01b0ng cho m\u1ee9c \u0111\u1ed9 c\u1ea3n tr\u1edf d\u00f2ng \u0111i\u1ec7n khi \u0111i qua m\u1ed9t v\u1eadt d\u1eabn. N\u00f3i m\u1ed9t c\u00e1ch d\u1ec5 hi\u1ec3u, khi d\u00f2ng \u0111i\u1ec7n ch\u1ea1y trong d\u00e2y d\u1eabn, c\u00e1c electron chuy\u1ec3n \u0111\u1ed9ng s\u1ebd va ch\u1ea1m v\u1edbi nguy\u00ean t\u1eed trong v\u1eadt li\u1ec7u, khi\u1ebfn n\u0103ng l\u01b0\u1ee3ng b\u1ecb ti\u00eau hao d\u01b0\u1edbi d\u1ea1ng nhi\u1ec7t. M\u1ee9c \u0111\u1ed9 c\u1ea3n tr\u1edf n\u00e0y ch\u00ednh l\u00e0 <strong data-start=\"653\" data-end=\"665\">\u0111i\u1ec7n tr\u1edf<\/strong>.<\/p>\n<p data-start=\"668\" data-end=\"959\">K\u00fd hi\u1ec7u c\u1ee7a \u0111i\u1ec7n tr\u1edf l\u00e0 <strong data-start=\"692\" data-end=\"697\">R<\/strong>, \u0111\u01a1n v\u1ecb \u0111o l\u00e0 <strong data-start=\"712\" data-end=\"722\">\u00d4m (\u03a9)<\/strong>. V\u1eadt li\u1ec7u c\u00f3 \u0111i\u1ec7n tr\u1edf c\u00e0ng l\u1edbn th\u00ec d\u00f2ng \u0111i\u1ec7n \u0111i qua c\u00e0ng y\u1ebfu, ng\u01b0\u1ee3c l\u1ea1i, n\u1ebfu \u0111i\u1ec7n tr\u1edf nh\u1ecf, d\u00f2ng \u0111i\u1ec7n ch\u1ea1y m\u1ea1nh h\u01a1n. V\u00ed d\u1ee5, d\u00e2y \u0111\u1ed3ng c\u00f3 \u0111i\u1ec7n tr\u1edf th\u1ea5p n\u00ean d\u1eabn \u0111i\u1ec7n t\u1ed1t, c\u00f2n cao su hay nh\u1ef1a c\u00f3 \u0111i\u1ec7n tr\u1edf r\u1ea5t cao n\u00ean g\u1ea7n nh\u01b0 kh\u00f4ng d\u1eabn \u0111i\u1ec7n.<\/p>\n<p style=\"text-align: center;\" data-start=\"668\" data-end=\"959\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-1.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-1-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-1-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-496479 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-1.jpg\" alt=\"cong-thuc-tinh-dien-tro-la-gi-dinh-luat-ohm-va-cach-doc-dien-tro-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p data-start=\"961\" data-end=\"1230\">Trong th\u1ef1c t\u1ebf, \u0111i\u1ec7n tr\u1edf \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng \u0111\u1ec3 gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n, ph\u00e2n chia \u0111i\u1ec7n \u00e1p, ho\u1eb7c b\u1ea3o v\u1ec7 c\u00e1c linh ki\u1ec7n \u0111i\u1ec7n t\u1eed kh\u1ecfi qu\u00e1 t\u1ea3i. Vi\u1ec7c hi\u1ec3u r\u00f5 b\u1ea3n ch\u1ea5t v\u00e0 c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf l\u00e0 n\u1ec1n t\u1ea3ng quan tr\u1ecdng trong v\u1eadt l\u00fd c\u0169ng nh\u01b0 trong c\u00e1c l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt \u0111i\u1ec7n \u2013 \u0111i\u1ec7n t\u1eed.<\/p>\n<h3 data-start=\"1237\" data-end=\"1258\"><strong data-start=\"1241\" data-end=\"1258\">\u0110\u1ecbnh lu\u1eadt Ohm<\/strong><\/h3>\n<p data-start=\"1260\" data-end=\"1412\"><strong data-start=\"1260\" data-end=\"1277\">\u0110\u1ecbnh lu\u1eadt Ohm<\/strong> l\u00e0 m\u1ed9t trong nh\u1eefng nguy\u00ean l\u00fd c\u01a1 b\u1ea3n nh\u1ea5t trong v\u1eadt l\u00fd \u0111i\u1ec7n h\u1ecdc, m\u00f4 t\u1ea3 m\u1ed1i quan h\u1ec7 gi\u1eefa \u0111i\u1ec7n \u00e1p, d\u00f2ng \u0111i\u1ec7n v\u00e0 \u0111i\u1ec7n tr\u1edf trong m\u1ea1ch \u0111i\u1ec7n. N\u1ed9i dung c\u1ee7a \u0111\u1ecbnh lu\u1eadt nh\u01b0 sau:<\/p>\n<blockquote data-start=\"1449\" data-end=\"1584\">\n<p data-start=\"1451\" data-end=\"1584\"><strong>\u201cC\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua m\u1ed9t d\u00e2y d\u1eabn t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u0111\u1eb7t v\u00e0o hai \u0111\u1ea7u d\u00e2y d\u1eabn v\u00e0 t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y.\u201d<\/strong><\/p>\n<\/blockquote>\n<p data-start=\"1586\" data-end=\"1623\">C\u00f4ng th\u1ee9c bi\u1ec3u di\u1ec5n \u0111\u1ecbnh lu\u1eadt Ohm l\u00e0: <strong>I=U\/R<\/strong><\/p>\n<p data-start=\"1648\" data-end=\"1659\">Trong \u0111\u00f3:<\/p>\n<ul data-start=\"1660\" data-end=\"1826\">\n<li data-start=\"1660\" data-end=\"1710\">\n<p data-start=\"1662\" data-end=\"1710\"><strong data-start=\"1662\" data-end=\"1667\">I<\/strong> l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n (\u0111\u01a1n v\u1ecb: Ampe \u2013 A)<\/p>\n<\/li>\n<li data-start=\"1711\" data-end=\"1777\">\n<p data-start=\"1713\" data-end=\"1777\"><strong data-start=\"1713\" data-end=\"1718\">U<\/strong> l\u00e0 hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y d\u1eabn (\u0111\u01a1n v\u1ecb: Volt \u2013 V)<\/p>\n<\/li>\n<li data-start=\"1778\" data-end=\"1826\">\n<p data-start=\"1780\" data-end=\"1826\"><strong data-start=\"1780\" data-end=\"1785\">R<\/strong> l\u00e0 \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn (\u0111\u01a1n v\u1ecb: \u00d4m \u2013 \u03a9)<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1828\" data-end=\"1892\">T\u1eeb c\u00f4ng th\u1ee9c tr\u00ean, ta c\u00f3 th\u1ec3 suy ra c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf: <strong>R=U\/I<\/strong><\/p>\n<p style=\"text-align: center;\" data-start=\"1917\" data-end=\"2100\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-2.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-2-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-2-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img decoding=\"async\" class=\"alignnone size-full wp-image-496470 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-2.jpg\" alt=\"cong-thuc-tinh-dien-tro-la-gi-dinh-luat-ohm-va-cach-doc-dien-tro-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p data-start=\"1917\" data-end=\"2100\">C\u00f4ng th\u1ee9c n\u00e0y cho bi\u1ebft n\u1ebfu bi\u1ebft hi\u1ec7u \u0111i\u1ec7n th\u1ebf v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n, ta c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng t\u00ednh \u0111\u01b0\u1ee3c \u0111i\u1ec7n tr\u1edf c\u1ee7a v\u1eadt d\u1eabn.<br data-start=\"2035\" data-end=\"2038\" \/>V\u00ed d\u1ee5: n\u1ebfu U = 12V v\u00e0 I = 2A th\u00ec \u0111i\u1ec7n tr\u1edf R = 12 \/ 2 = <strong data-start=\"2093\" data-end=\"2099\">6\u03a9<\/strong>.<\/p>\n<h2 data-start=\"2107\" data-end=\"2150\"><strong data-start=\"2110\" data-end=\"2150\">C\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf trong v\u1eadt l\u00fd<\/strong><\/h2>\n<p data-start=\"1818\" data-end=\"2043\">Trong th\u1ef1c t\u1ebf, \u0111i\u1ec7n tr\u1edf c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u1eafc song song ho\u1eb7c n\u1ed1i ti\u1ebfp t\u00f9y theo y\u00eau c\u1ea7u c\u1ee7a m\u1ea1ch \u0111i\u1ec7n. M\u1ed7i c\u00e1ch m\u1eafc l\u1ea1i c\u00f3 m\u1ed9t c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf ri\u00eang bi\u1ec7t, gi\u00fap ng\u01b0\u1eddi h\u1ecdc d\u1ec5 d\u00e0ng x\u00e1c \u0111\u1ecbnh t\u1ed5ng \u0111i\u1ec7n tr\u1edf c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<h3 data-start=\"2338\" data-end=\"2379\"><strong data-start=\"2342\" data-end=\"2379\">C\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf song song<\/strong><\/h3>\n<p data-start=\"2381\" data-end=\"2563\">Khi c\u00e1c \u0111i\u1ec7n tr\u1edf \u0111\u01b0\u1ee3c m\u1eafc song song, c\u00e1c \u0111\u1ea7u c\u1ee7a ch\u00fang c\u00f9ng \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi hai \u0111i\u1ec3m chung trong m\u1ea1ch \u0111i\u1ec7n. \u0110i\u1ec7n \u00e1p gi\u1eefa c\u00e1c \u0111i\u1ec7n tr\u1edf b\u1eb1ng nhau, nh\u01b0ng d\u00f2ng \u0111i\u1ec7n qua m\u1ed7i nh\u00e1nh kh\u00e1c nhau.<\/p>\n<p data-start=\"2565\" data-end=\"2623\">C\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ee7a m\u1ea1ch song song l\u00e0: <strong>1\/Rt=1\/R1 + 1\/R2 + 1\/R3 + 1\/R4 + &#8230; + 1\/Rn<\/strong><\/p>\n<p data-start=\"2721\" data-end=\"2732\">Trong \u0111\u00f3:<\/p>\n<ul data-start=\"2733\" data-end=\"2828\">\n<li data-start=\"2733\" data-end=\"2781\">\n<p data-start=\"2735\" data-end=\"2781\"><strong data-start=\"2735\" data-end=\"2752\">R\u2081, R\u2082, R\u2083&#8230;<\/strong> l\u00e0 c\u00e1c \u0111i\u1ec7n tr\u1edf th\u00e0nh ph\u1ea7n<\/p>\n<\/li>\n<li data-start=\"2782\" data-end=\"2828\">\n<p data-start=\"2784\" data-end=\"2828\"><strong data-start=\"2784\" data-end=\"2790\">R\u209c<\/strong> l\u00e0 \u0111i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ee7a to\u00e0n m\u1ea1ch<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2830\" data-end=\"2898\">Tr\u01b0\u1eddng h\u1ee3p ch\u1ec9 c\u00f3 hai \u0111i\u1ec7n tr\u1edf song song, c\u00f4ng th\u1ee9c c\u00f3 th\u1ec3 vi\u1ebft g\u1ecdn: <span class=\"katex-display\"><span class=\"katex\"><strong><span class=\"katex-mathml\">Rt=(R1\u00d7R2)\/(R1+R2)<\/span><\/strong><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"msupsub\"><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p data-start=\"2946\" data-end=\"3017\"><strong data-start=\"2946\" data-end=\"2956\">V\u00ed d\u1ee5: <\/strong>N\u1ebfu c\u00f3 hai \u0111i\u1ec7n tr\u1edf R\u2081 = 6\u03a9 v\u00e0 R\u2082 = 3\u03a9 m\u1eafc song song, th\u00ec: <span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">Rt=(6\u00d73)\/(6+3)=<strong>2\u03a9\u00a0<\/strong><\/span><\/span><\/span><\/p>\n<p style=\"text-align: center;\" data-start=\"3062\" data-end=\"3282\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-6.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-6-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-6-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img decoding=\"async\" class=\"alignnone size-full wp-image-496474 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-6.jpg\" alt=\"cong-thuc-tinh-dien-tro-la-gi-dinh-luat-ohm-va-cach-doc-dien-tro-6\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-6.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-6-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-6-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p data-start=\"3062\" data-end=\"3282\">\u0110i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ee7a m\u1ea1ch song song lu\u00f4n nh\u1ecf h\u01a1n gi\u00e1 tr\u1ecb nh\u1ecf nh\u1ea5t trong c\u00e1c \u0111i\u1ec7n tr\u1edf th\u00e0nh ph\u1ea7n. \u0110i\u1ec1u n\u00e0y l\u00fd gi\u1ea3i v\u00ec sao trong m\u1ea1ch \u0111i\u1ec7n d\u00e2n d\u1ee5ng, khi m\u1eafc nhi\u1ec1u thi\u1ebft b\u1ecb song song, d\u00f2ng \u0111i\u1ec7n t\u1ed5ng th\u01b0\u1eddng t\u0103ng l\u00ean.<\/p>\n<h3 data-start=\"3289\" data-end=\"3333\"><strong data-start=\"3293\" data-end=\"3333\">C\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf m\u1eafc n\u1ed1i ti\u1ebfp<\/strong><\/h3>\n<p data-start=\"3335\" data-end=\"3457\">Khi c\u00e1c \u0111i\u1ec7n tr\u1edf m\u1eafc n\u1ed1i ti\u1ebfp, d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua c\u00e1c \u0111i\u1ec7n tr\u1edf l\u00e0 nh\u01b0 nhau, nh\u01b0ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf chia \u0111\u1ec1u theo t\u1eebng ph\u1ea7n.<\/p>\n<p data-start=\"3459\" data-end=\"3518\">C\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng trong m\u1ea1ch n\u1ed1i ti\u1ebfp l\u00e0: <span class=\"katex-display\"><span class=\"katex\"><strong><span class=\"katex-mathml\">Rt=R1+R2+R3+&#8230;+Rn<\/span><\/strong><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p data-start=\"3561\" data-end=\"3639\"><strong data-start=\"3561\" data-end=\"3571\">V\u00ed d\u1ee5: <\/strong>N\u1ebfu c\u00f3 ba \u0111i\u1ec7n tr\u1edf R\u2081 = 2\u03a9, R\u2082 = 4\u03a9 v\u00e0 R\u2083 = 6\u03a9 m\u1eafc n\u1ed1i ti\u1ebfp, th\u00ec: <span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">Rt=2+4+6=<strong>12\u03a9<\/strong><\/span><\/span><\/span><\/p>\n<p style=\"text-align: center;\" data-start=\"3670\" data-end=\"3813\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-8.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-8-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-8-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-496476 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-8.jpg\" alt=\"cong-thuc-tinh-dien-tro-la-gi-dinh-luat-ohm-va-cach-doc-dien-tro-8\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-8.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-8-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-8-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p data-start=\"3670\" data-end=\"3813\">\u0110i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng trong m\u1ea1ch n\u1ed1i ti\u1ebfp lu\u00f4n l\u1edbn h\u01a1n t\u1eebng \u0111i\u1ec7n tr\u1edf th\u00e0nh ph\u1ea7n, do t\u1ed5ng \u0111i\u1ec7n \u00e1p c\u1ea7n cung c\u1ea5p \u0111\u1ec3 duy tr\u00ec d\u00f2ng \u0111i\u1ec7n t\u0103ng l\u00ean.<\/p>\n<h2 data-start=\"3820\" data-end=\"3867\"><strong data-start=\"3823\" data-end=\"3867\">H\u01b0\u1edbng d\u1eabn 2 c\u00e1ch \u0111\u1ecdc \u0111i\u1ec7n tr\u1edf th\u00f4ng d\u1ee5ng<\/strong><\/h2>\n<p data-start=\"3869\" data-end=\"4131\">\u0110i\u1ec7n tr\u1edf trong m\u1ea1ch \u0111i\u1ec7n t\u1eed th\u01b0\u1eddng c\u00f3 k\u00edch th\u01b0\u1edbc nh\u1ecf, gi\u00e1 tr\u1ecb c\u1ee7a ch\u00fang kh\u00f4ng \u0111\u01b0\u1ee3c in tr\u1ef1c ti\u1ebfp b\u1eb1ng s\u1ed1 m\u00e0 th\u1ec3 hi\u1ec7n qua v\u00f2ng m\u00e0u ho\u1eb7c m\u00e3 m\u00e0u. Vi\u1ec7c \u0111\u1ecdc ch\u00ednh x\u00e1c gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf l\u00e0 k\u1ef9 n\u0103ng c\u01a1 b\u1ea3n v\u1edbi h\u1ecdc sinh h\u1ecdc v\u1eadt l\u00fd, k\u1ef9 s\u01b0 \u0111i\u1ec7n v\u00e0 ng\u01b0\u1eddi l\u00e0m k\u1ef9 thu\u1eadt.<\/p>\n<h3 data-start=\"4138\" data-end=\"4180\"><strong data-start=\"4142\" data-end=\"4180\">C\u00e1ch \u0111\u1ecdc \u0111i\u1ec7n tr\u1edf d\u1ef1a v\u00e0o v\u00f2ng m\u00e0u<\/strong><\/h3>\n<p data-start=\"4182\" data-end=\"4303\">Tr\u00ean th\u00e2n \u0111i\u1ec7n tr\u1edf th\u01b0\u1eddng c\u00f3 4, 5 ho\u1eb7c 6 v\u00f2ng m\u00e0u, m\u1ed7i m\u00e0u t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t con s\u1ed1 c\u1ee5 th\u1ec3. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u1ea3ng quy \u01b0\u1edbc:<\/p>\n<div class=\"_tableContainer_1rjym_1\">\n<div class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"4305\" data-end=\"4482\">\n<thead data-start=\"4305\" data-end=\"4331\">\n<tr data-start=\"4305\" data-end=\"4331\">\n<th data-start=\"4305\" data-end=\"4315\" data-col-size=\"sm\">M\u00e0u s\u1eafc<\/th>\n<th data-start=\"4315\" data-end=\"4331\" data-col-size=\"sm\">S\u1ed1 t\u01b0\u01a1ng \u1ee9ng<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"4361\" data-end=\"4482\">\n<tr data-start=\"4361\" data-end=\"4372\">\n<td data-start=\"4361\" data-end=\"4367\" data-col-size=\"sm\">\u0110en<\/td>\n<td data-start=\"4367\" data-end=\"4372\" data-col-size=\"sm\">0<\/td>\n<\/tr>\n<tr data-start=\"4373\" data-end=\"4384\">\n<td data-start=\"4373\" data-end=\"4379\" data-col-size=\"sm\">N\u00e2u<\/td>\n<td data-start=\"4379\" data-end=\"4384\" data-col-size=\"sm\">1<\/td>\n<\/tr>\n<tr data-start=\"4385\" data-end=\"4395\">\n<td data-start=\"4385\" data-end=\"4390\" data-col-size=\"sm\">\u0110\u1ecf<\/td>\n<td data-start=\"4390\" data-end=\"4395\" data-col-size=\"sm\">2<\/td>\n<\/tr>\n<tr data-start=\"4396\" data-end=\"4407\">\n<td data-start=\"4396\" data-end=\"4402\" data-col-size=\"sm\">Cam<\/td>\n<td data-start=\"4402\" data-end=\"4407\" data-col-size=\"sm\">3<\/td>\n<\/tr>\n<tr data-start=\"4408\" data-end=\"4420\">\n<td data-start=\"4408\" data-end=\"4415\" data-col-size=\"sm\">V\u00e0ng<\/td>\n<td data-start=\"4415\" data-end=\"4420\" data-col-size=\"sm\">4<\/td>\n<\/tr>\n<tr data-start=\"4421\" data-end=\"4432\">\n<td data-start=\"4421\" data-end=\"4427\" data-col-size=\"sm\">L\u1ee5c<\/td>\n<td data-start=\"4427\" data-end=\"4432\" data-col-size=\"sm\">5<\/td>\n<\/tr>\n<tr data-start=\"4433\" data-end=\"4444\">\n<td data-start=\"4433\" data-end=\"4439\" data-col-size=\"sm\">Lam<\/td>\n<td data-start=\"4439\" data-end=\"4444\" data-col-size=\"sm\">6<\/td>\n<\/tr>\n<tr data-start=\"4445\" data-end=\"4456\">\n<td data-start=\"4445\" data-end=\"4451\" data-col-size=\"sm\">T\u00edm<\/td>\n<td data-start=\"4451\" data-end=\"4456\" data-col-size=\"sm\">7<\/td>\n<\/tr>\n<tr data-start=\"4457\" data-end=\"4468\">\n<td data-start=\"4457\" data-end=\"4463\" data-col-size=\"sm\">X\u00e1m<\/td>\n<td data-start=\"4463\" data-end=\"4468\" data-col-size=\"sm\">8<\/td>\n<\/tr>\n<tr data-start=\"4469\" data-end=\"4482\">\n<td data-start=\"4469\" data-end=\"4477\" data-col-size=\"sm\">Tr\u1eafng<\/td>\n<td data-start=\"4477\" data-end=\"4482\" data-col-size=\"sm\">9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"4484\" data-end=\"4506\">C\u00e1ch \u0111\u1ecdc 4 v\u00f2ng m\u00e0u:<\/p>\n<ul data-start=\"4507\" data-end=\"4610\">\n<li data-start=\"4507\" data-end=\"4546\">\n<p data-start=\"4509\" data-end=\"4546\"><strong data-start=\"4509\" data-end=\"4523\">V\u00f2ng 1 &amp; 2<\/strong>: hai ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean<\/p>\n<\/li>\n<li data-start=\"4547\" data-end=\"4585\">\n<p data-start=\"4549\" data-end=\"4585\"><strong data-start=\"4549\" data-end=\"4559\">V\u00f2ng 3<\/strong>: s\u1ed1 nh\u00e2n (s\u1ed1 m\u0169 c\u1ee7a 10)<\/p>\n<\/li>\n<li data-start=\"4586\" data-end=\"4610\">\n<p data-start=\"4588\" data-end=\"4610\"><strong data-start=\"4588\" data-end=\"4598\">V\u00f2ng 4<\/strong>: sai s\u1ed1 (%)<\/p>\n<\/li>\n<\/ul>\n<p style=\"text-align: center;\" data-start=\"4612\" data-end=\"4678\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-4.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-4-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-4-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-496472 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-4.jpg\" alt=\"cong-thuc-tinh-dien-tro-la-gi-dinh-luat-ohm-va-cach-doc-dien-tro-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p data-start=\"4612\" data-end=\"4678\"><strong data-start=\"4612\" data-end=\"4622\">V\u00ed d\u1ee5:<\/strong><br data-start=\"4622\" data-end=\"4625\" \/>M\u1ed9t \u0111i\u1ec7n tr\u1edf c\u00f3 4 v\u00f2ng m\u00e0u: <strong data-start=\"4653\" data-end=\"4678\">\u0110\u1ecf \u2013 T\u00edm \u2013 Cam \u2013 V\u00e0ng<\/strong><\/p>\n<p data-start=\"4680\" data-end=\"4743\">=&gt; Suy ra gi\u00e1 tr\u1ecb l\u00e0: 27 \u00d7 10\u00b3 = <strong data-start=\"4713\" data-end=\"4731\">27.000\u03a9 = 27k\u03a9<\/strong>, sai s\u1ed1 5%.<\/p>\n<h3 data-start=\"4750\" data-end=\"4791\"><strong data-start=\"4754\" data-end=\"4791\">C\u00e1ch \u0111\u1ecdc \u0111i\u1ec7n tr\u1edf d\u1ef1a tr\u00ean m\u00e3 m\u00e0u<\/strong><\/h3>\n<p data-start=\"4793\" data-end=\"4905\">V\u1edbi c\u00e1c \u0111i\u1ec7n tr\u1edf 5 ho\u1eb7c 6 v\u00f2ng m\u00e0u, c\u00e1ch \u0111\u1ecdc t\u01b0\u01a1ng t\u1ef1, ch\u1ec9 kh\u00e1c l\u00e0 c\u00f3 th\u00eam 1 ho\u1eb7c 2 v\u00f2ng \u0111\u1ec3 t\u0103ng \u0111\u1ed9 ch\u00ednh x\u00e1c.<\/p>\n<p data-start=\"4907\" data-end=\"4935\"><strong data-start=\"4907\" data-end=\"4933\">V\u00ed d\u1ee5 \u0111i\u1ec7n tr\u1edf 5 v\u00f2ng:<\/strong><\/p>\n<ul data-start=\"4936\" data-end=\"5022\">\n<li data-start=\"4936\" data-end=\"4972\">\n<p data-start=\"4938\" data-end=\"4972\"><strong data-start=\"4938\" data-end=\"4951\">V\u00f2ng 1\u20133:<\/strong> ba ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean<\/p>\n<\/li>\n<li data-start=\"4973\" data-end=\"4999\">\n<p data-start=\"4975\" data-end=\"4999\"><strong data-start=\"4975\" data-end=\"4986\">V\u00f2ng 4:<\/strong> h\u1ec7 s\u1ed1 nh\u00e2n<\/p>\n<\/li>\n<li data-start=\"5000\" data-end=\"5022\">\n<p data-start=\"5002\" data-end=\"5022\"><strong data-start=\"5002\" data-end=\"5013\">V\u00f2ng 5:<\/strong> sai s\u1ed1<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"5024\" data-end=\"5138\">N\u1ebfu m\u1ed9t \u0111i\u1ec7n tr\u1edf c\u00f3 m\u00e0u: <strong data-start=\"5049\" data-end=\"5079\">N\u00e2u \u2013 \u0110en \u2013 \u0110en \u2013 \u0110\u1ecf \u2013 N\u00e2u<\/strong><br data-start=\"5079\" data-end=\"5082\" \/>=&gt; Gi\u00e1 tr\u1ecb = 100 \u00d7 10\u00b2 = <strong data-start=\"5107\" data-end=\"5125\">10.000\u03a9 = 10k\u03a9<\/strong>, sai s\u1ed1 \u00b11%.<\/p>\n<p style=\"text-align: center;\" data-start=\"5140\" data-end=\"5394\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-3.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-3-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-3-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-496471 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-3.jpg\" alt=\"cong-thuc-tinh-dien-tro-la-gi-dinh-luat-ohm-va-cach-doc-dien-tro-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p data-start=\"5140\" data-end=\"5394\">Vi\u1ec7c \u0111\u1ecdc m\u00e3 m\u00e0u gi\u00fap k\u1ef9 thu\u1eadt vi\u00ean nhanh ch\u00f3ng nh\u1eadn bi\u1ebft gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf m\u00e0 kh\u00f4ng c\u1ea7n thi\u1ebft b\u1ecb \u0111o. Tuy nhi\u00ean, trong th\u1ef1c t\u1ebf, \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u00ednh x\u00e1c, ng\u01b0\u1eddi ta v\u1eabn th\u01b0\u1eddng d\u00f9ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng (multimeter) \u0111\u1ec3 ki\u1ec3m tra tr\u1ef1c ti\u1ebfp gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf th\u1eadt.<\/p>\n<h2 data-start=\"5401\" data-end=\"5452\"><strong data-start=\"5404\" data-end=\"5452\">M\u1ed9t s\u1ed1 l\u00fd thuy\u1ebft kh\u00e1c li\u00ean quan \u0111\u1ebfn \u0111i\u1ec7n tr\u1edf<\/strong><\/h2>\n<p>Khi \u0111\u00e3 hi\u1ec3u r\u00f5 c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf v\u00e0 c\u00e1ch \u0111\u1ecdc \u0111i\u1ec7n tr\u1edf, b\u1ea1n c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng ki\u1ebfn th\u1ee9c v\u1edbi c\u00e1c kh\u00e1i ni\u1ec7m li\u00ean quan nh\u01b0 d\u00f2ng \u0111i\u1ec7n v\u00e0 tr\u1edf kh\u00e1ng. \u0110\u00e2y l\u00e0 nh\u1eefng y\u1ebfu t\u1ed1 gi\u00fap gi\u1ea3i th\u00edch s\u00e2u h\u01a1n c\u00e1ch d\u00f2ng \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng trong c\u00e1c m\u00f4i tr\u01b0\u1eddng v\u00e0 thi\u1ebft b\u1ecb kh\u00e1c nhau.<\/p>\n<h3 data-start=\"5459\" data-end=\"5499\"><strong data-start=\"5463\" data-end=\"5499\">D\u00f2ng \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/strong><\/h3>\n<p data-start=\"5501\" data-end=\"5695\">D\u00f2ng \u0111i\u1ec7n l\u00e0 d\u00f2ng d\u1ecbch chuy\u1ec3n c\u00f3 h\u01b0\u1edbng c\u1ee7a c\u00e1c electron trong v\u1eadt d\u1eabn. Khi c\u00f3 hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u v\u1eadt d\u1eabn, c\u00e1c electron t\u1ef1 do s\u1ebd di chuy\u1ec3n t\u1eeb c\u1ef1c \u00e2m sang c\u1ef1c d\u01b0\u01a1ng, t\u1ea1o th\u00e0nh d\u00f2ng \u0111i\u1ec7n.<\/p>\n<p style=\"text-align: center;\" data-start=\"5501\" data-end=\"5695\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-7.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-7-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-7-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-496475 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-7.jpg\" alt=\"cong-thuc-tinh-dien-tro-la-gi-dinh-luat-ohm-va-cach-doc-dien-tro-7\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-7.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-7-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-7-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p data-start=\"5697\" data-end=\"5930\">\u0110i\u1ec7n tr\u1edf \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 di chuy\u1ec3n c\u1ee7a d\u00f2ng \u0111i\u1ec7n. V\u1eadt li\u1ec7u c\u00f3 \u0111i\u1ec7n tr\u1edf th\u1ea5p cho ph\u00e9p electron \u0111i qua d\u1ec5 d\u00e0ng, d\u00f2ng \u0111i\u1ec7n m\u1ea1nh. Ng\u01b0\u1ee3c l\u1ea1i, v\u1eadt li\u1ec7u c\u00f3 \u0111i\u1ec7n tr\u1edf cao s\u1ebd h\u1ea1n ch\u1ebf s\u1ef1 di chuy\u1ec3n c\u1ee7a electron, d\u00f2ng \u0111i\u1ec7n y\u1ebfu h\u01a1n. Ngo\u00e0i ra, \u0111i\u1ec7n tr\u1edf t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi chi\u1ec1u d\u00e0i d\u00e2y d\u1eabn v\u00e0 t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi ti\u1ebft di\u1ec7n c\u1ee7a d\u00e2y. V\u1eadt li\u1ec7u d\u1eabn \u0111i\u1ec7n t\u1ed1t nh\u01b0 \u0111\u1ed3ng, nh\u00f4m c\u00f3 \u0111i\u1ec7n tr\u1edf su\u1ea5t th\u1ea5p, trong khi v\u1eadt c\u00e1ch \u0111i\u1ec7n nh\u01b0 nh\u1ef1a, g\u1ed7 c\u00f3 \u0111i\u1ec7n tr\u1edf su\u1ea5t r\u1ea5t cao.<\/p>\n<h3 data-start=\"6161\" data-end=\"6185\"><strong data-start=\"6165\" data-end=\"6185\">Tr\u1edf kh\u00e1ng l\u00e0 g\u00ec?<\/strong><\/h3>\n<p data-start=\"6187\" data-end=\"6428\">Tr\u1edf kh\u00e1ng (k\u00fd hi\u1ec7u l\u00e0 <strong data-start=\"6209\" data-end=\"6214\">Z<\/strong>) l\u00e0 kh\u00e1i ni\u1ec7m m\u1edf r\u1ed9ng c\u1ee7a c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf, \u00e1p d\u1ee5ng trong m\u1ea1ch \u0111i\u1ec7n xoay chi\u1ec1u (AC). Trong khi \u0111i\u1ec7n tr\u1edf ch\u1ec9 c\u1ea3n tr\u1edf d\u00f2ng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u (DC), th\u00ec tr\u1edf kh\u00e1ng bi\u1ec3u di\u1ec5n t\u1ed5ng h\u1ee3p c\u1ea3 \u0111i\u1ec7n tr\u1edf v\u00e0 <strong data-start=\"6397\" data-end=\"6410\">c\u1ea3m kh\u00e1ng<\/strong> \u2013 <strong data-start=\"6413\" data-end=\"6427\">dung kh\u00e1ng<\/strong>.<\/p>\n<p data-start=\"6430\" data-end=\"6455\">C\u00f4ng th\u1ee9c t\u00ednh tr\u1edf kh\u00e1ng: <span class=\"katex-display\"><span class=\"katex\"><strong><span class=\"katex-mathml\">Z=sqrt{R^2 + (Xl &#8211; Xc)^2}<\/span><\/strong><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord sqrt\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p data-start=\"6495\" data-end=\"6506\">Trong \u0111\u00f3:<\/p>\n<ul data-start=\"6507\" data-end=\"6620\">\n<li data-start=\"6507\" data-end=\"6532\">\n<p data-start=\"6509\" data-end=\"6532\"><strong data-start=\"6509\" data-end=\"6514\">R<\/strong> l\u00e0 \u0111i\u1ec7n tr\u1edf (\u03a9)<\/p>\n<\/li>\n<li data-start=\"6533\" data-end=\"6577\">\n<p data-start=\"6535\" data-end=\"6577\"><strong data-start=\"6535\" data-end=\"6541\">Xl<\/strong>\u00a0l\u00e0 c\u1ea3m kh\u00e1ng (do cu\u1ed9n c\u1ea3m g\u00e2y ra)<\/p>\n<\/li>\n<li data-start=\"6578\" data-end=\"6620\">\n<p data-start=\"6580\" data-end=\"6620\"><strong data-start=\"6580\" data-end=\"6586\">Xc<\/strong>\u00a0l\u00e0 dung kh\u00e1ng (do t\u1ee5 \u0111i\u1ec7n g\u00e2y ra)<\/p>\n<\/li>\n<\/ul>\n<p style=\"text-align: center;\" data-start=\"6622\" data-end=\"6867\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-5.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-5-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-5-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-496473 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-5.jpg\" alt=\"cong-thuc-tinh-dien-tro-la-gi-dinh-luat-ohm-va-cach-doc-dien-tro-5\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-5.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-5-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-5-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p data-start=\"6622\" data-end=\"6867\">Tr\u1edf kh\u00e1ng th\u1ec3 hi\u1ec7n kh\u1ea3 n\u0103ng c\u1ea3n tr\u1edf d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u trong m\u1ea1ch. N\u00f3 \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn c\u00f4ng su\u1ea5t ti\u00eau th\u1ee5, t\u00edn hi\u1ec7u \u00e2m thanh, s\u00f3ng v\u00f4 tuy\u1ebfn v\u00e0 nhi\u1ec1u \u1ee9ng d\u1ee5ng \u0111i\u1ec7n t\u1eed kh\u00e1c. Hi\u1ec3u r\u00f5 tr\u1edf kh\u00e1ng gi\u00fap k\u1ef9 s\u01b0 thi\u1ebft k\u1ebf m\u1ea1ch \u0111\u1ea1t hi\u1ec7u su\u1ea5t t\u1ed1i \u01b0u.<\/p>\n<h2 data-start=\"6874\" data-end=\"6918\"><strong data-start=\"6877\" data-end=\"6918\">\u1ee8ng d\u1ee5ng c\u1ee7a \u0111i\u1ec7n tr\u1edf trong th\u1ef1c ti\u1ec5n<\/strong><\/h2>\n<p data-start=\"6920\" data-end=\"7079\">C\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf kh\u00f4ng ch\u1ec9 l\u00e0 kh\u00e1i ni\u1ec7m l\u00fd thuy\u1ebft m\u00e0 c\u00f2n c\u00f3 vai tr\u00f2 c\u1ef1c k\u1ef3 quan tr\u1ecdng trong h\u1ea7u h\u1ebft c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n \u2013 \u0111i\u1ec7n t\u1eed hi\u1ec7n nay. M\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng ph\u1ed5 bi\u1ebfn g\u1ed3m:<\/p>\n<p data-start=\"7081\" data-end=\"7121\"><strong data-start=\"7085\" data-end=\"7121\">Gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n trong m\u1ea1ch: <\/strong>Trong c\u00e1c m\u1ea1ch \u0111i\u1ec7n t\u1eed, \u0111i\u1ec7n tr\u1edf gi\u00fap ki\u1ec3m so\u00e1t l\u01b0\u1ee3ng d\u00f2ng \u0111i\u1ec7n \u0111i qua linh ki\u1ec7n, tr\u00e1nh hi\u1ec7n t\u01b0\u1ee3ng qu\u00e1 t\u1ea3i. V\u00ed d\u1ee5, trong m\u1ea1ch LED, \u0111i\u1ec7n tr\u1edf n\u1ed1i ti\u1ebfp v\u1edbi b\u00f3ng \u0111\u00e8n gi\u00fap b\u1ea3o v\u1ec7 LED kh\u1ecfi ch\u00e1y do d\u00f2ng \u0111i\u1ec7n qu\u00e1 m\u1ea1nh.<\/p>\n<p data-start=\"7335\" data-end=\"7368\"><strong data-start=\"7339\" data-end=\"7368\">Ph\u00e2n \u00e1p, chia \u0111i\u1ec7n \u00e1p: <\/strong>\u0110i\u1ec7n tr\u1edf c\u00f3 th\u1ec3 d\u00f9ng \u0111\u1ec3 t\u1ea1o m\u1ea1ch ph\u00e2n \u00e1p, chia hi\u1ec7u \u0111i\u1ec7n th\u1ebf th\u00e0nh nhi\u1ec1u ph\u1ea7n nh\u1ecf. \u1ee8ng d\u1ee5ng n\u00e0y th\u01b0\u1eddng g\u1eb7p trong c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9, bi\u1ebfn tr\u1edf, hay m\u1ea1ch \u0111o \u0111i\u1ec7n \u00e1p.<\/p>\n<p data-start=\"7538\" data-end=\"7570\"><strong data-start=\"7542\" data-end=\"7570\">Sinh nhi\u1ec7t, l\u00e0m n\u00f3ng: <\/strong>Khi d\u00f2ng \u0111i\u1ec7n \u0111i qua \u0111i\u1ec7n tr\u1edf, n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n bi\u1ebfn th\u00e0nh nhi\u1ec7t (hi\u1ec7n t\u01b0\u1ee3ng Joule). \u0110\u00e2y l\u00e0 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb nh\u01b0 b\u00e0n \u1ee7i, b\u1ebfp \u0111i\u1ec7n, l\u00f2 s\u01b0\u1edfi, m\u00e1y s\u1ea5y t\u00f3c&#8230;<\/p>\n<p data-start=\"7747\" data-end=\"7798\"><strong data-start=\"7751\" data-end=\"7798\">D\u00f9ng trong m\u1ea1ch khu\u1ebfch \u0111\u1ea1i, l\u1ecdc t\u00edn hi\u1ec7u: <\/strong>Trong k\u1ef9 thu\u1eadt \u0111i\u1ec7n t\u1eed, \u0111i\u1ec7n tr\u1edf \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c m\u1ea1ch khu\u1ebfch \u0111\u1ea1i \u00e2m thanh, m\u1ea1ch l\u1ecdc t\u1ea7n s\u1ed1 ho\u1eb7c m\u1ea1ch \u0111i\u1ec1u ch\u1ec9nh \u00e2m l\u01b0\u1ee3ng. Nh\u1edd \u0111i\u1ec7n tr\u1edf, t\u00edn hi\u1ec7u \u0111i\u1ec7n \u0111\u01b0\u1ee3c \u1ed5n \u0111\u1ecbnh, gi\u1ea3m nhi\u1ec5u v\u00e0 \u0111\u1ea1t ch\u1ea5t l\u01b0\u1ee3ng cao h\u01a1n.<\/p>\n<p data-start=\"8010\" data-end=\"8056\"><strong data-start=\"8014\" data-end=\"8056\">\u1ee8ng d\u1ee5ng trong \u0111o l\u01b0\u1eddng v\u00e0 c\u1ea3m bi\u1ebfn: <\/strong>\u0110i\u1ec7n tr\u1edf c\u00f2n \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong c\u00e1c c\u1ea3m bi\u1ebfn \u0111o nhi\u1ec7t \u0111\u1ed9 (RTD), c\u1ea3m bi\u1ebfn \u00e1nh s\u00e1ng (LDR), hay c\u1ea3m bi\u1ebfn \u00e1p su\u1ea5t. Khi m\u00f4i tr\u01b0\u1eddng thay \u0111\u1ed5i, gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf bi\u1ebfn thi\u00ean, gi\u00fap h\u1ec7 th\u1ed1ng x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng v\u1eadt l\u00fd t\u01b0\u01a1ng \u1ee9ng.<\/p>\n<p style=\"text-align: center;\" data-start=\"8010\" data-end=\"8056\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-10.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-10-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-10-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-496478 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-10.jpg\" alt=\"cong-thuc-tinh-dien-tro-la-gi-dinh-luat-ohm-va-cach-doc-dien-tro-10\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-10.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-10-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2025\/10\/cong-thuc-tinh-dien-tro-10-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h2 data-start=\"8290\" data-end=\"8305\"><strong data-start=\"8293\" data-end=\"8305\">K\u1ebft lu\u1eadn<\/strong><\/h2>\n<p data-start=\"8307\" data-end=\"8612\">Qua b\u00e0i vi\u1ebft n\u00e0y c\u1ee7a Ho\u00e0ng H\u00e0 Mobile, b\u1ea1n \u0111\u00e3 hi\u1ec3u r\u00f5 \u0111i\u1ec7n tr\u1edf l\u00e0 g\u00ec, \u0111\u1ecbnh lu\u1eadt Ohm, c\u00f9ng c\u00e1c c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf c\u01a1 b\u1ea3n trong v\u1eadt l\u00fd, bao g\u1ed3m \u0111i\u1ec7n tr\u1edf n\u1ed1i ti\u1ebfp v\u00e0 song song. B\u00ean c\u1ea1nh \u0111\u00f3, vi\u1ec7c n\u1eafm v\u1eefng c\u00e1ch \u0111\u1ecdc \u0111i\u1ec7n tr\u1edf qua v\u00f2ng m\u00e0u v\u00e0 m\u00e3 m\u00e0u s\u1ebd gi\u00fap b\u1ea1n thao t\u00e1c d\u1ec5 d\u00e0ng khi l\u00e0m vi\u1ec7c v\u1edbi m\u1ea1ch \u0111i\u1ec7n th\u1ef1c t\u1ebf. \u0110i\u1ec7n tr\u1edf l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a m\u1ecdi h\u1ec7 th\u1ed1ng \u0111i\u1ec7n, t\u1eeb nh\u1eefng m\u1ea1ch \u0111\u01a1n gi\u1ea3n nh\u1ea5t cho \u0111\u1ebfn thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed hi\u1ec7n \u0111\u1ea1i. Hi\u1ec3u \u0111\u00fang v\u00e0 \u1ee9ng d\u1ee5ng linh ho\u1ea1t c\u00e1c c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf kh\u00f4ng ch\u1ec9 gi\u00fap b\u1ea1n h\u1ecdc t\u1ed1t v\u1eadt l\u00fd m\u00e0 c\u00f2n m\u1edf ra nhi\u1ec1u c\u01a1 h\u1ed9i trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt, c\u00f4ng ngh\u1ec7 v\u00e0 ch\u1ebf t\u1ea1o.<\/p>\n<p data-start=\"8307\" data-end=\"8612\"><em><strong>XEM TH\u00caM:<\/strong><\/em><\/p>\n<ul>\n<li data-start=\"8307\" data-end=\"8612\"><strong><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/tinh-cong\/\">C\u00f4ng c\u01a1 h\u1ecdc l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c t\u00ednh c\u00f4ng chu\u1ea9n k\u00e8m v\u00ed d\u1ee5 minh h\u1ecda<\/a><\/strong><\/li>\n<li data-start=\"8307\" data-end=\"8612\"><strong><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-suat-dien-cho-biet\/\">C\u00f4ng su\u1ea5t \u0111i\u1ec7n cho bi\u1ebft \u0111i\u1ec1u g\u00ec? C\u00f4ng th\u1ee9c t\u00ednh c\u00f4ng su\u1ea5t \u0111i\u1ec7n 1 chi\u1ec1u, xoay chi\u1ec1u<\/a><\/strong><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Trong l\u0129nh v\u1ef1c \u0111i\u1ec7n h\u1ecdc, \u0111i\u1ec7n tr\u1edf l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n nh\u01b0ng v\u00f4 c\u00f9ng quan tr\u1ecdng, xu\u1ea5t hi\u1ec7n trong h\u1ea7u h\u1ebft c\u00e1c m\u1ea1ch \u0111i\u1ec7n t\u1eeb \u0111\u01a1n gi\u1ea3n \u0111\u1ebfn ph\u1ee9c t\u1ea1p. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf kh\u00f4ng ch\u1ec9 gi\u00fap ng\u01b0\u1eddi h\u1ecdc n\u1eafm v\u1eefng nguy\u00ean l\u00fd d\u00f2ng \u0111i\u1ec7n m\u00e0 c\u00f2n l\u00e0 n\u1ec1n [&hellip;]<\/p>\n","protected":false},"author":75,"featured_media":496469,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-495762","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 v24.2 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf l\u00e0 g\u00ec? \u0110\u1ecbnh lu\u1eadt Ohm v\u00e0 c\u00e1ch \u0111\u1ecdc \u0111i\u1ec7n tr\u1edf<\/title>\n<meta name=\"description\" content=\"C\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf l\u00e0 g\u00ec? T\u00ecm hi\u1ec3u \u0111\u1ecbnh lu\u1eadt Ohm, c\u00e1ch t\u00ednh \u0111i\u1ec7n tr\u1edf n\u1ed1i ti\u1ebfp, song song v\u00e0 h\u01b0\u1edbng d\u1eabn \u0111\u1ecdc \u0111i\u1ec7n tr\u1edf chi ti\u1ebft.\" \/>\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\/cong-thuc-tinh-dien-tro\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf l\u00e0 g\u00ec? \u0110\u1ecbnh lu\u1eadt Ohm v\u00e0 c\u00e1ch \u0111\u1ecdc \u0111i\u1ec7n tr\u1edf\" \/>\n<meta property=\"og:description\" content=\"C\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf l\u00e0 g\u00ec? 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