{"id":3930,"date":"2026-08-21T18:05:30","date_gmt":"2026-08-21T18:05:30","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=3930"},"modified":"2026-08-21T18:05:31","modified_gmt":"2026-08-21T18:05:31","slug":"how-do-you-determine-amperage","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/vi\/blog\/how-do-you-determine-amperage\/","title":{"rendered":"L\u00e0m Th\u1ebf N\u00e0o \u0110\u1ec3 B\u1ea1n X\u00e1c \u0110\u1ecbnh D\u00f2ng Ampe?"},"content":{"rendered":"<p>Kh\u00f4ng quan tr\u1ecdng b\u1ea1n \u0111ang \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc m\u1ea1ch, ch\u1ea9n \u0111o\u00e1n b\u1ed9 ng\u1eaft m\u1ea1ch b\u1ecb nh\u1ea3y, ch\u1ecdn pin hay mua m\u00e1y ph\u00e1t \u0111i\u1ec7n, c\u00e2u h\u1ecfi lu\u00f4n quay l\u1ea1i v\u1edbi ampe \u2013 d\u00f2ng \u0111i\u1ec7n th\u1ef1c s\u1ef1 c\u1ea7n l\u00e0 bao nhi\u00eau? C\u00f3 th\u1ec3 nghe c\u00f3 v\u1ebb \u0111\u01a1n gi\u1ea3n nh\u01b0ng khi n\u00f3i v\u1ec1 d\u00f2ng \u0111i\u1ec7n, b\u1ea1n th\u1ef1c s\u1ef1 c\u1ea7n ba c\u00e1ch \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh n\u00f3: b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ecdc, t\u00ednh to\u00e1n ho\u1eb7c \u0111o l\u01b0\u1eddng.<\/p>\n<blockquote><p>T\u00f3m t\u1eaft: B\u1ea1n c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh d\u00f2ng \u0111i\u1ec7n theo nhi\u1ec1u c\u00e1ch: (1) b\u1eb1ng c\u00e1ch ki\u1ec3m tra b\u1ea3ng t\u00ean \u2013 h\u1ea7u h\u1ebft thi\u1ebft b\u1ecb \u0111\u1ec1u cho bi\u1ebft ampe c\u1ee7a ch\u00fang; (2) b\u1eb1ng c\u00e1ch t\u00ednh to\u00e1n \u2013 n\u1ebfu bi\u1ebft t\u1ea3i, c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c I = P \u00f7 V ho\u1eb7c \u0111\u1ecbnh lu\u1eadt Ohm I = V \u00f7 R; (3) b\u1eb1ng c\u00e1ch \u0111o \u2013 b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ampe k\u1ebf k\u1eb9p d\u00e2y ho\u1eb7c ng\u1eaft m\u1ea1ch v\u00e0 d\u00f9ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng \u0111\u1ec3 \u0111o d\u00f2ng \u0111i\u1ec7n n\u1ed1i ti\u1ebfp.<\/p><\/blockquote>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3932\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/The-Three-Ways-to-Determine-Amperage.webp\" alt=\"Ba C\u00e1ch X\u00e1c \u0110\u1ecbnh D\u00f2ng \u0110i\u1ec7n\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>Ba C\u00e1ch X\u00e1c \u0110\u1ecbnh D\u00f2ng \u0110i\u1ec7n<\/h2>\n<p>C\u00f3 ba ph\u01b0\u01a1ng ph\u00e1p th\u1ef1c s\u1ef1 \u0111\u1ec3 bi\u1ebft d\u00f2ng \u0111i\u1ec7n c\u1ee7a b\u1ea5t k\u1ef3 t\u1ea3i ho\u1eb7c m\u1ea1ch n\u00e0o, v\u00e0 bi\u1ebft c\u00e1c ph\u01b0\u01a1ng ph\u00e1p n\u00e0y gi\u00fap ti\u1ebft ki\u1ec7m th\u1eddi gian v\u00e0 lo\u1ea1i b\u1ecf r\u1ee7i ro.<\/p>\n<table>\n<thead>\n<tr>\n<th>Ph\u01b0\u01a1ng ph\u00e1p<\/th>\n<th>T\u1ed1t nh\u1ea5t khi<\/th>\n<th>\u0110\u1ed9 ch\u00ednh x\u00e1c<\/th>\n<th>R\u1ee7i ro<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u0110\u1ecdc b\u1ea3ng t\u00ean<\/strong><\/td>\n<td>B\u1ea1n c\u00f3 th\u1ec3 truy c\u1eadp nh\u00e3n thi\u1ebft b\u1ecb<\/td>\n<td>T\u1ed1t (gi\u00e1 tr\u1ecb \u0111\u1ecbnh m\u1ee9c)<\/td>\n<td>Kh\u00f4ng c\u00f3<\/td>\n<\/tr>\n<tr>\n<td><strong>T\u00ednh to\u00e1n<\/strong><\/td>\n<td>B\u1ea1n bi\u1ebft c\u00f4ng su\u1ea5t\/\u0111i\u1ec7n \u00e1p ho\u1eb7c \u0111i\u1ec7n tr\u1edf\/\u0111i\u1ec7n \u00e1p<\/td>\n<td>T\u1ed1t (ph\u1ee5 thu\u1ed9c v\u00e0o d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o)<\/td>\n<td>Kh\u00f4ng c\u00f3<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110o l\u01b0\u1eddng<\/strong><\/td>\n<td>B\u1ea1n c\u1ea7n d\u00f2ng \u0111i\u1ec7n th\u1ef1c t\u1ebf \u0111ang ch\u1ea1y ho\u1eb7c ch\u1ea9n \u0111o\u00e1n<\/td>\n<td>Xu\u1ea5t s\u1eafc (\u0111\u1ecdc th\u1ef1c t\u1ebf)<\/td>\n<td>Nguy hi\u1ec3m \u0111i\u1ec7n \u2013 ph\u1ea3i tu\u00e2n th\u1ee7 quy t\u1eafc an to\u00e0n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p, v\u00ed d\u1ee5 nh\u01b0 \u201cthi\u1ebft b\u1ecb s\u01b0\u1edfi n\u00e0y s\u1eed d\u1ee5ng bao nhi\u00eau ampe\u201d, b\u1ea3ng t\u00ean ho\u1eb7c t\u00ednh to\u00e1n nhanh s\u1ebd cung c\u1ea5p c\u00e2u tr\u1ea3 l\u1eddi m\u00e0 kh\u00f4ng c\u1ea7n ch\u1ea1m v\u00e0o d\u00e2y. Vi\u1ec7c \u0111o ch\u1ec9 n\u00ean th\u1ef1c hi\u1ec7n khi b\u1ea1n c\u1ea7n bi\u1ebft l\u1ed7i th\u1ef1c s\u1ef1; ch\u1ec9 c\u00f3 ampe k\u1ebf k\u1eb9p ho\u1eb7c \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng n\u1ed1i ti\u1ebfp m\u1edbi cung c\u1ea5p \u0111\u01b0\u1ee3c th\u00f4ng tin \u0111\u00f3.<\/p>\n<h2>Ph\u01b0\u01a1ng ph\u00e1p 1: \u0110\u1ecdc B\u1ea3ng T\u00ean<\/h2>\n<p>Nh\u00e3n l\u00e0 c\u00e1ch nhanh nh\u1ea5t v\u00e0 an to\u00e0n nh\u1ea5t \u0111\u1ec3 bi\u1ebft d\u00f2ng \u0111i\u1ec7n. M\u1ed7i thi\u1ebft b\u1ecb, d\u1ee5ng c\u1ee5, \u0111\u1ed9ng c\u01a1 v\u00e0 b\u1ed9 s\u1ea1c \u0111\u1ec1u c\u00f3 b\u1ea3ng t\u00ean hi\u1ec3n th\u1ecb th\u00f4ng s\u1ed1 \u0111i\u1ec7n:<\/p>\n<ul>\n<li>Ampe \u0111\u1ecbnh m\u1ee9c: m\u1ed9t s\u1ed1 b\u1ea3ng t\u00ean ghi ampe theo \u0111\u1ecbnh d\u1ea1ng \u201cAmps: X A\u201d v\u00e0 \u201cCurrent: X A\u201d.<\/li>\n<li>C\u00f4ng su\u1ea5t v\u00e0 \u0110i\u1ec7n \u00e1p: m\u1ed9t s\u1ed1 nh\u00e3n cho bi\u1ebft c\u00f4ng su\u1ea5t (ho\u1eb7c kW) v\u00e0 \u0111i\u1ec7n \u00e1p; s\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i.<\/li>\n<li>K\u1ebft h\u1ee3p \u0111\u1ecbnh m\u1ee9c: thi\u1ebft b\u1ecb HVAC ch\u1ec9 ra FLA (d\u00f2ng \u0111i\u1ec7n t\u1ea3i \u0111\u1ea7y \u0111\u1ee7), RLA (d\u00f2ng \u0111i\u1ec7n t\u1ea3i \u0111\u1ecbnh m\u1ee9c) v\u00e0 MCA (d\u00f2ng \u0111i\u1ec7n m\u1ea1ch t\u1ed1i thi\u1ec3u) \u2014 FLA l\u00e0 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y v\u00e0 MCA l\u00e0 k\u00edch th\u01b0\u1edbc d\u00e2y li\u00ean quan \u0111\u1ebfn d\u00f2ng \u0111i\u1ec7n.<\/li>\n<li>\u0110\u1ed9ng c\u01a1: c\u1ed1 g\u1eafng t\u00ecm gi\u00e1 tr\u1ecb FLA \u1edf \u0111i\u1ec7n \u00e1p y\u00eau c\u1ea7u (d\u00f2ng \u0111i\u1ec7n \u0111\u1ed9ng c\u01a1 thay \u0111\u1ed5i \u1edf 120V v\u00e0 240V).<\/li>\n<\/ul>\n<p>V\u00ed d\u1ee5, m\u1ed9t m\u00e1y s\u01b0\u1edfi kh\u00f4ng gian \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u \u201c1,500W, 120V\u201d c\u00f3 th\u1ec3 t\u00ednh nh\u01b0 sau: Amps = 1,500 \u00f7 120 = 12.5A. \u0110\u00e2y l\u00e0 l\u00fd do t\u1ea1i sao m\u00e1y s\u01b0\u1edfi c\u00f3 h\u01b0\u1edbng d\u1eabn \u201cKh\u00f4ng s\u1eed d\u1ee5ng tr\u00ean m\u1ea1ch 15A c\u00f9ng v\u1edbi c\u00e1c t\u1ea3i kh\u00e1c\u201d \u2014 12.5A g\u1ea7n v\u1edbi d\u00f2ng \u0111i\u1ec7n t\u1ed1i \u0111a cho ph\u00e9p c\u1ee7a 80% l\u00e0 12A.<\/p>\n<h2>Ph\u01b0\u01a1ng ph\u00e1p 2: T\u00ednh To\u00e1n (C\u00e1c C\u00f4ng Th\u1ee9c)<\/h2>\n<p>N\u1ebfu b\u1ea1n \u0111\u01b0\u1ee3c cung c\u1ea5p c\u00f4ng su\u1ea5t, s\u1ed1 kilowatt ho\u1eb7c \u0111i\u1ec7n tr\u1edf tr\u00ean b\u1ea3ng t\u00ean, c\u00f3 hai c\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n \u0111\u1ec3 t\u00ednh d\u00f2ng \u0111i\u1ec7n:<\/p>\n<p>\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c c\u00f4ng su\u1ea5t c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng trong h\u1ea7u h\u1ebft c\u00e1c t\u00ecnh hu\u1ed1ng.<\/p>\n<p>Amps = Watts \u00f7 Volts (I=P\u00f7V)<\/p>\n<ul>\n<li>M\u1ed9t m\u00e1y s\u01b0\u1edfi c\u00f3 c\u00f4ng su\u1ea5t 1500W v\u00e0 \u0111i\u1ec7n \u00e1p 120V c\u00f3 d\u00f2ng \u0111i\u1ec7n 12.5 ampe.<\/li>\n<li>M\u1ed9t l\u00f2 n\u01b0\u1edbng 3000W v\u1edbi \u0111i\u1ec7n \u00e1p 240V c\u00f3 d\u00f2ng \u0111i\u1ec7n 12.5 ampe (c\u00f9ng c\u00f4ng su\u1ea5t nh\u01b0ng d\u00f2ng \u0111i\u1ec7n b\u1eb1ng m\u1ed9t n\u1eeda).<\/li>\n<li>M\u1ed9t m\u00e1y ph\u00e1t \u0111i\u1ec7n 5kW v\u1edbi \u0111i\u1ec7n \u00e1p 240V c\u00f3 d\u00f2ng \u0111i\u1ec7n trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y l\u00e0 5.000 \u00f7 240 \u2248 20,8A.<\/li>\n<\/ul>\n<p>\u0110\u1ecbnh lu\u1eadt Ohm \u00e1p d\u1ee5ng khi bi\u1ebft \u0111i\u1ec7n tr\u1edf.<\/p>\n<ul>\n<li>Amps = Volts \u00f7 Ohms (I=V\u00f7R)<\/li>\n<li>V\u00ed d\u1ee5 trong m\u1ea1ch 12V v\u1edbi t\u1ea3i 4 ohm, c\u1ea7n t\u00ednh: 12 \u00f7 4 = 3 A.<\/li>\n<\/ul>\n<p>\u1ee8ng d\u1ee5ng t\u00ednh to\u00e1n ba pha trong ch\u1ebf \u0111\u1ed9 c\u00f4ng nghi\u1ec7p.<\/p>\n<ul>\n<li>Amps = Watts \u00f7 (Volts \u00d7 1.732 \u00d7 H\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t)<\/li>\n<li>V\u00ed d\u1ee5, \u0111\u1ed9ng c\u01a1 10kW ti\u00eau th\u1ee5 \u0111i\u1ec7n ba pha 400V, H\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t 0,85 \u2192 10.000 \u00f7 (400 \u00d7 1.732 \u00d7 0.85) \u2248 17A. (\u0110\u1ec3 c\u00f3 con s\u1ed1 g\u1ea7n \u0111\u00fang, vui l\u00f2ng b\u1ecf qua h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t v\u00e0 t\u00ednh trong kho\u1ea3ng 15%)<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3933\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/choose-the-right-tool-for-the-job.webp\" alt=\"ch\u1ecdn c\u00f4ng c\u1ee5 ph\u00f9 h\u1ee3p cho c\u00f4ng vi\u1ec7c\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>Ph\u01b0\u01a1ng ph\u00e1p 3: \u0110o tr\u1ef1c ti\u1ebfp (C\u00f4ng c\u1ee5 &amp; C\u00e1c b\u01b0\u1edbc)<\/h2>\n<p>N\u1ebfu b\u1ea1n c\u1ea7n d\u00f2ng t\u1ea3i th\u1ef1c t\u1ebf cho \u0111\u1ed9ng c\u01a1 \u0111ang t\u1ea3i, m\u1ea1ch duy tr\u00ec \u0111i\u1ec3m ng\u1eaft ho\u1eb7c \u0111\u1ec3 ki\u1ec3m tra x\u1ea3 pin, th\u00ec b\u1ea1n th\u1ef1c hi\u1ec7n \u0111o d\u00f2ng \u0111i\u1ec7n. Hai ph\u01b0\u01a1ng ti\u1ec7n:<\/p>\n<table>\n<thead>\n<tr>\n<th>C\u00f4ng c\u1ee5<\/th>\n<th>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng<\/th>\n<th>T\u1ed1t Nh\u1ea5t Cho<\/th>\n<th>Gi\u00e1<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u0110\u1ed3ng h\u1ed3 k\u1eb9p (ammeter)<\/strong><\/td>\n<td>K\u1eb9p h\u00e0m quanh m\u1ed9t d\u00e2y d\u1eabn; \u0111o tr\u01b0\u1eddng t\u1eeb \u2014 kh\u00f4ng c\u1ea7n ti\u1ebfp x\u00fac<\/td>\n<td>M\u1ea1ch \u0111ang ho\u1ea1t \u0111\u1ed9ng, \u0111\u1ed9ng c\u01a1, d\u00f2ng \u0111i\u1ec7n to\u00e0n thi\u1ebft b\u1ecb<\/td>\n<td>$30-$150<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1ed3ng h\u1ed3 \u0111a n\u0103ng (m\u1ea1ch n\u1ed1i ti\u1ebfp)<\/strong><\/td>\n<td>M\u1edf m\u1ea1ch v\u00e0 cho d\u00f2ng \u0111i\u1ec7n \u0111i qua \u0111\u1ed3ng h\u1ed3<\/td>\n<td>D\u00f2ng \u0111i\u1ec7n DC th\u1ea5p (pin, c\u1ea3m bi\u1ebfn), c\u00f4ng vi\u1ec7c tr\u00ean b\u00e0n<\/td>\n<td>$20-$100<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u0110\u1ed3ng h\u1ed3 k\u1eb9p l\u00e0 thi\u1ebft b\u1ecb \u01b0u ti\u00ean cho d\u00f2ng \u0111i\u1ec7n AC v\u00ec n\u00f3 \u0111o d\u00f2ng \u0111i\u1ec7n m\u00e0 kh\u00f4ng l\u00e0m gi\u00e1n \u0111o\u1ea1n m\u1ea1ch ho\u1eb7c ti\u1ebfp x\u00fac v\u1edbi c\u00e1c th\u00e0nh ph\u1ea7n \u0111ang c\u00f3 \u0111i\u1ec7n. Do \u0111\u00f3, n\u00f3 an to\u00e0n h\u01a1n v\u00e0 th\u00e2n thi\u1ec7n v\u1edbi ng\u01b0\u1eddi d\u00f9ng h\u01a1n \u0111\u1ed3ng h\u1ed3 \u0111a n\u0103ng c\u01a1 b\u1ea3n khi \u0111\u1ecdc d\u00f2ng \u0111i\u1ec7n trong nh\u00e0 v\u00e0 b\u1ea3ng \u0111i\u1ec7n.<\/p>\n<h2>S\u1eed d\u1ee5ng \u0111\u1ed3ng h\u1ed3 k\u1eb9p \u0111\u00fang c\u00e1ch<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 h\u01b0\u1edbng d\u1eabn t\u1eebng b\u01b0\u1edbc v\u1ec1 c\u00e1ch s\u1eed d\u1ee5ng \u0111\u1ed3ng h\u1ed3 ampe k\u1eb9p:<\/p>\n<ul>\n<li>\u0110\u1ec3 b\u1eaft \u0111\u1ea7u, c\u1ea7n x\u00e1c \u0111\u1ecbnh xem \u0111o b\u1eb1ng Ampe AC (A~) hay Ampe DC.<\/li>\n<li>Ti\u1ebfp theo, n\u1ebfu \u0111\u1ed3ng h\u1ed3 c\u00f3 n\u00fat zero, c\u1ea7n ph\u1ea3i \u0111\u1eb7t v\u1ec1 zero.<\/li>\n<li>Khi \u0111o d\u00f2ng \u0111i\u1ec7n, ch\u1ec9 n\u00ean k\u1eb9p m\u1ed9t d\u00e2y d\u1eabn t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m.<\/li>\n<li>Sau khi th\u1ef1c hi\u1ec7n xong b\u01b0\u1edbc \u0111\u00f3, ch\u00fang ta c\u1ea7n \u0111\u1ecdc gi\u00e1 tr\u1ecb tr\u00ean m\u00e0n h\u00ecnh hi\u1ec3n th\u1ecb.<\/li>\n<li>\u0110\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c ph\u00e9p \u0111o ch\u00ednh x\u00e1c, h\u00e0m k\u1eb9p ph\u1ea3i \u0111\u01b0\u1ee3c gi\u1eef ch\u1eb7t v\u00e0 \u1edf v\u1ecb tr\u00ed vu\u00f4ng g\u00f3c.<\/li>\n<li>Cu\u1ed1i c\u00f9ng, h\u00e3y nh\u1edb r\u1eb1ng m\u1eb7c d\u00f9 b\u1ea3ng t\u00ean \u0111\u1ed9ng c\u01a1 ch\u1ec9 \u0111\u1ecbnh \u0111\u1ecbnh m\u1ee9c FLA c\u1ee7a n\u00f3, d\u01b0\u1edbi t\u1ea3i th\u1ef1c t\u1ebf, d\u00f2ng \u0111i\u1ec7n c\u00f3 th\u1ec3 l\u1edbn h\u01a1n so v\u1edbi th\u00f4ng s\u1ed1 tr\u00ean b\u1ea3ng t\u00ean.<\/li>\n<\/ul>\n<h2>S\u1eed d\u1ee5ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng theo ki\u1ec3u n\u1ed1i ti\u1ebfp<\/h2>\n<p>Khi l\u00e0m vi\u1ec7c v\u1edbi m\u1ea1ch DC (pin, t\u1ea5m pin m\u1eb7t tr\u1eddi, c\u1ea3m bi\u1ebfn) v\u00e0 d\u00f2ng AC th\u1ea5p tr\u00ean b\u00e0n th\u1eed nghi\u1ec7m, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng theo ki\u1ec3u n\u1ed1i ti\u1ebfp.<\/p>\n<ul>\n<li>\u0110\u1ea7u ti\u00ean t\u1eaft ngu\u1ed3n \u0111i\u1ec7n c\u1ee7a m\u1ea1ch v\u00e0 ng\u1eaft m\u1ed9t d\u00e2y \u0111\u1ec3 c\u00f3 th\u1ec3 m\u1edf m\u1ea1ch.<\/li>\n<li>Ti\u1ebfp theo k\u1ebft n\u1ed1i d\u00e2y: d\u00e2y \u0111en v\u00e0o COM v\u00e0 d\u00e2y \u0111\u1ecf v\u00e0o \u1ed5 c\u1eafm A (ampe) v\u00e0 \u0111\u1eb7t n\u00fam \u0111i\u1ec1u ch\u1ec9nh.<\/li>\n<li>K\u1ebft n\u1ed1i \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng theo ki\u1ec3u n\u1ed1i ti\u1ebfp v\u1edbi t\u1ea3i, sao cho d\u00f2ng \u0111i\u1ec7n \u0111i qua \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng: ngu\u1ed3n \u2192 \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng \u2192 t\u1ea3i.<\/li>\n<li>B\u1eaft \u0111\u1ea7u \u0111o \u1edf d\u1ea3i d\u00f2ng cao (nh\u01b0 10A) tr\u01b0\u1edbc, sau \u0111\u00f3 khi gi\u00e1 tr\u1ecb \u0111o th\u1ea5p th\u00ec chuy\u1ec3n sang d\u1ea3i d\u00f2ng th\u1ea5p h\u01a1n. Nh\u01b0ng kh\u00f4ng b\u1eaft \u0111\u1ea7u v\u1edbi d\u1ea3i d\u00f2ng th\u1ea5p v\u00ec c\u00f3 th\u1ec3 l\u00e0m ch\u00e1y c\u1ea7u ch\u00ec!<\/li>\n<li>Sau \u0111\u00f3 b\u1eadt ngu\u1ed3n v\u00e0 l\u1ea5y gi\u00e1 tr\u1ecb \u0111o.<\/li>\n<\/ul>\n<p>Kh\u00f4ng bao gi\u1edd k\u1ebft n\u1ed1i \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng \u0111\u1eb7t \u1edf ch\u1ebf \u0111\u1ed9 \u0111o ampe tr\u1ef1c ti\u1ebfp v\u00e0o ngu\u1ed3n \u0111i\u1ec7n v\u00ec s\u1ebd g\u00e2y ch\u1eadp m\u1ea1ch!<\/p>\n<h2>Quy t\u1eafc an to\u00e0n khi \u0111o d\u00f2ng \u0111i\u1ec7n<\/h2>\n<ul>\n<li>\u0110\u1ed3ng h\u1ed3 k\u1eb9p an to\u00e0n khi l\u00e0m vi\u1ec7c quanh d\u00e2y d\u1eabn c\u00f3 \u0111i\u1ec7n; \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng n\u1ed1i ti\u1ebfp th\u00ec kh\u00f4ng. \u0110\u1ec3 \u0111o d\u00f2ng AC trong nh\u00e0\/b\u1ea3ng \u0111i\u1ec7n, b\u1ea1n n\u00ean d\u00f9ng \u0111\u1ed3ng h\u1ed3 k\u1eb9p \u2014 b\u1ea1n s\u1ebd kh\u00f4ng ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp v\u1edbi d\u00e2y d\u1eabn.<\/li>\n<li>Kh\u00f4ng bao gi\u1edd d\u00f9ng \u0111\u1ed3ng h\u1ed3 k\u1eb9p tr\u00ean c\u00e1p c\u00f3 nhi\u1ec1u d\u00e2y, v\u00ec s\u1ebd cho k\u1ebft qu\u1ea3 sai (g\u1ea7n b\u1eb1ng kh\u00f4ng) v\u00e0 kh\u00f4ng cung c\u1ea5p th\u00f4ng tin h\u1eefu \u00edch.<\/li>\n<li>H\u00e3y nh\u1edb: vi ph\u1ea1m quy t\u1eafc b\u1ea3ng \u0111i\u1ec7n r\u1ea5t nguy hi\u1ec3m; ngay c\u1ea3 vi\u1ec7c ch\u1ea1m v\u00e0o b\u1ea3ng ng\u1eaft m\u1ea1ch c\u0169ng l\u00e0 l\u00e0m vi\u1ec7c v\u1edbi \u0111i\u1ec7n \u00e1p s\u1ed1ng; n\u1ebfu b\u1ea1n kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u00e0o t\u1ea1o, h\u00e3y d\u1eebng ngay l\u1eadp t\u1ee9c.<\/li>\n<li>Tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u ki\u1ec3m tra \u0111\u1ed3ng h\u1ed3, \u0111\u1ea3m b\u1ea3o r\u1eb1ng n\u00f3 \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 theo CAT III \u0111\u1ed1i v\u1edbi m\u1ea1ch ph\u00e2n ph\u1ed1i v\u00e0 CAT IV \u0111\u1ed1i v\u1edbi \u0111i\u1ec3m v\u00e0o d\u1ecbch v\u1ee5.<\/li>\n<li>\u0110\u1ed1i v\u1edbi ph\u00e9p \u0111o n\u1ed1i ti\u1ebfp, t\u1eaft ngu\u1ed3n tr\u01b0\u1edbc, k\u1ebft n\u1ed1i \u0111\u1ed3ng h\u1ed3, sau \u0111\u00f3 b\u1eadt ngu\u1ed3n l\u1ea1i.<\/li>\n<li>N\u1ebfu c\u00f3 nghi ng\u1edd, h\u00e3y t\u00ednh to\u00e1n ho\u1eb7c ki\u1ec3m tra th\u00f4ng tin tr\u00ean b\u1ea3ng t\u00ean, v\u00ec trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p, ph\u00e9p \u0111o ampe kh\u00f4ng ph\u1ea3i l\u00e0 \u0111o tr\u1ef1c ti\u1ebfp tr\u00ean d\u00f2ng \u0111i\u1ec7n s\u1ed1ng.<\/li>\n<\/ul>\n<h2>Gi\u1ea3i th\u00edch d\u00f2ng ampe: C\u00f4ng su\u1ea5t, \u0110i\u1ec7n \u00e1p &amp; Quy t\u1eafc 80%<\/h2>\n<p>\u0110\u00e2y l\u00e0 c\u00e1ch x\u1eed l\u00fd d\u00f2ng ampe:<\/p>\n<ul>\n<li>C\u00f4ng su\u1ea5t (Watt) = Ampe \u00d7 Volt \u2014 t\u00ednh to\u00e1n c\u00f4ng su\u1ea5t cho n\u0103ng l\u01b0\u1ee3ng v\u00e0 chi ph\u00ed.<\/li>\n<li>\u0110\u1ecbnh m\u1ee9c ampe so v\u1edbi \u0111\u1ecbnh m\u1ee9c c\u1ea7u dao \u2013 t\u1ea3i kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 \u0111\u1ecbnh m\u1ee9c m\u1ea1ch, v\u00ed d\u1ee5, c\u1ea7u dao 15A gi\u1edbi h\u1ea1n t\u1ed5ng t\u1ea3i 1.800W.<\/li>\n<li>Quy t\u1eafc 80% cho t\u1ea3i ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c tr\u00ean ba gi\u1edd \u2013 t\u1ea3i b\u1ecb gi\u1edbi h\u1ea1n \u1edf 80% c\u1ee7a \u0111\u1ecbnh m\u1ee9c m\u1ea1ch. V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n d\u00f9ng m\u1ea1ch 15A, c\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 t\u1ed1i \u0111a l\u00e0 1.440W. N\u1ebfu d\u00f9ng m\u1ea1ch 20A, c\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 1.920W.<\/li>\n<li>D\u00f2ng kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1 \u2013 \u0111\u1ed9ng c\u01a1 h\u00fat d\u00f2ng l\u00ean \u0111\u1ebfn 5-8 l\u1ea7n d\u00f2ng ch\u1ea1y khi kh\u1edfi \u0111\u1ed9ng.<\/li>\n<li>T\u01b0\u01a1ng t\u00e1c gi\u1eefa \u0111i\u1ec7n \u00e1p v\u00e0 d\u00f2ng \u0111i\u1ec7n \u2013 v\u1edbi c\u00f4ng su\u1ea5t 1.500W, d\u00f2ng \u0111i\u1ec7n c\u1ee7a b\u1ed9 s\u01b0\u1edfi ph\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec7n \u00e1p, n\u1ebfu b\u1ed9 s\u01b0\u1edfi \u0111\u01b0\u1ee3c c\u1eafm v\u00e0o 120V, n\u00f3 l\u1ea5y 12,5A, trong khi c\u1eafm v\u00e0o 240V, d\u00f2ng \u0111i\u1ec7n gi\u1ea3m xu\u1ed1ng c\u00f2n 6,25.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3934\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/Amps-vs-Volts-vs-Watts.webp\" alt=\"Ampe vs V\u00f4n vs O\u00e1t\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>Amps vs Volts vs Watts: S\u1ef1 kh\u00e1c bi\u1ec7t l\u00e0 g\u00ec?<\/h2>\n<p>Ba \u0111\u01a1n v\u1ecb n\u00e0y m\u00f4 t\u1ea3 ba kh\u00eda c\u1ea1nh kh\u00e1c nhau, v\u00e0 nh\u1ea7m l\u1eabn ch\u00fang c\u00f3 th\u1ec3 g\u00e2y ra sai s\u00f3t nghi\u00eam tr\u1ecdng:<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0110\u01a1n v\u1ecb<\/th>\n<th>\u0110o l\u01b0\u1eddng<\/th>\n<th>T\u01b0\u01a1ng t\u1ef1<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Volt (V)<\/strong><\/td>\n<td>\u00c1p \u0111i\u1ec7n \/ \u0111i\u1ec7n th\u1ebf<\/td>\n<td>\u00c1p l\u1ef1c n\u01b0\u1edbc trong \u1ed1ng<\/td>\n<\/tr>\n<tr>\n<td><strong>Ampe (A)<\/strong><\/td>\n<td>D\u00f2ng \u0111i\u1ec7n \u2014 t\u1ed1c \u0111\u1ed9 d\u00f2ng ch\u1ea3y<\/td>\n<td>L\u01b0\u1ee3ng n\u01b0\u1edbc ch\u1ea3y qua m\u1ed7i gi\u00e2y<\/td>\n<\/tr>\n<tr>\n<td><strong>Watt (W)<\/strong><\/td>\n<td>C\u00f4ng su\u1ea5t \u0111i\u1ec7n \u2014 n\u0103ng l\u01b0\u1ee3ng m\u1ed7i gi\u00e2y<\/td>\n<td>C\u00f4ng vi\u1ec7c m\u00e0 n\u01b0\u1edbc th\u1ef1c hi\u1ec7n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Volts t\u1ea1o l\u1ef1c, amps \u0111i\u1ec1u h\u01b0\u1edbng v\u00e0 watt l\u00e0 h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t, ngh\u0129a l\u00e0 Watts = Volts \u00d7 Amps. N\u1ebfu \u0111i\u1ec7n \u00e1p cao v\u00e0 d\u00f2ng \u0111i\u1ec7n th\u1ea5p (nh\u01b0 \u0111i\u1ec7n t\u0129nh, h\u00e0ng ngh\u00ecn volt v\u00e0 microamps) th\u00ec c\u00f3 th\u1ec3 v\u00f4 h\u1ea1i. Tuy nhi\u00ean, n\u1ebfu \u0111i\u1ec7n \u00e1p th\u1ea5p v\u00e0 d\u00f2ng \u0111i\u1ec7n cao (v\u00ed d\u1ee5, \u1eafc quy \u00f4 t\u00f4 12 volt ho\u1ea1t \u0111\u1ed9ng v\u1edbi h\u00e0ng tr\u0103m amps) th\u00ec c\u00f3 th\u1ec3 g\u00e2y ch\u1ebft ng\u01b0\u1eddi. Lu\u00f4n l\u01b0u \u00fd r\u1eb1ng amps v\u00e0 volts ph\u1ea3i \u0111i c\u00f9ng nhau.<\/p>\n<h2>C\u00e1ch x\u00e1c \u0111\u1ecbnh nh\u00e0 b\u1ea1n l\u00e0 100A hay 200A<\/h2>\n<p>C\u00e1c b\u01b0\u1edbc \u0111\u01a1n gi\u1ea3n kh\u00f4ng c\u1ea7n thi\u1ebft b\u1ecb:<\/p>\n<ul>\n<li>\u0110\u1ec3 \u0111\u1ecdc c\u1ea7u dao ch\u00ednh, t\u00ecm c\u1ea7u dao hi\u1ec3n th\u1ecb trong b\u1ea3ng \u0111i\u1ec7n. N\u00f3 c\u00f3 s\u1ed1 nh\u01b0 \u201c100\u201d ho\u1eb7c \u201c200\u201d ch\u1ec9 dung l\u01b0\u1ee3ng c\u1ee7a n\u00f3.<\/li>\n<li>\u0110\u1ec3 \u0111\u1ecdc \u0111\u1ed3ng h\u1ed3 \u0111i\u1ec7n, c\u00f3 th\u1ec3 c\u00f3 s\u1ed1 \u0111\u1ecdc tr\u00ean \u1ed5 c\u1eafm \u0111\u1ed3ng h\u1ed3 ho\u1eb7c th\u1ebb ti\u1ec7n \u00edch.<\/li>\n<li>Xem nh\u00e3n b\u00ean trong th\u01b0\u1eddng ch\u1ec9 k\u00edch th\u01b0\u1edbc c\u1ee7a c\u1ea7u dao ch\u00ednh v\u00e0 thanh c\u00e1i \u0111i\u1ec7n.<\/li>\n<li>G\u1ecdi nh\u00e0 cung c\u1ea5p \u0111i\u1ec7n v\u00e0 y\u00eau c\u1ea7u th\u00f4ng tin v\u1ec1 k\u00edch th\u01b0\u1edbc d\u1ecbch v\u1ee5 c\u1ee7a b\u1ea1n.<\/li>\n<\/ul>\n<p>T\u1ea7m quan tr\u1ecdng c\u1ee7a th\u00f4ng tin: d\u1ecbch v\u1ee5 100A s\u1ebd ng\u0103n b\u1ea1n th\u00eam c\u00e1c thi\u1ebft b\u1ecb ti\u00eau th\u1ee5 nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng nh\u01b0 xe \u0111i\u1ec7n, m\u00e1y s\u01b0\u1edfi v\u00e0 l\u00f2 n\u01b0\u1edbng; d\u1ecbch v\u1ee5 200A l\u00e0 ti\u00eau chu\u1ea9n hi\u1ec7n \u0111\u1ea1i. N\u1ebfu c\u1ea7u dao th\u01b0\u1eddng xuy\u00ean nh\u1ea3y khi b\u1ea1n th\u00eam t\u1ea3i, v\u00e0 c\u1ea7u dao ch\u00ednh l\u00e0 100A, n\u00e2ng c\u1ea5p c\u00f3 th\u1ec3 l\u00e0 gi\u1ea3i ph\u00e1p th\u1ef1c s\u1ef1 \u2014 v\u00e0 n\u1ebfu m\u1ed9t c\u1ea7u dao ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng \u0111\u00fang, <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/how-to-tell-if-a-breaker-is-bad\/\" rel=\"nofollow\">bi\u1ebft c\u00e1ch x\u00e1c \u0111\u1ecbnh c\u1ea7u dao b\u1ecb h\u1ecfng<\/a> t\u00e1ch thi\u1ebft b\u1ecb \u0111\u00e3 m\u00f2n ra kh\u1ecfi m\u1ea1ch th\u1ef1c s\u1ef1 b\u1ecb qu\u00e1 t\u1ea3i. \u0110\u1ec3 bi\u1ebft chi ti\u1ebft v\u1ec1 k\u00edch th\u01b0\u1edbc v\u00e0 chi ph\u00ed, h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/how-many-watts-on-a-15-amp-circuit\/\" rel=\"nofollow\">m\u1ed9t m\u1ea1ch 15 ampe c\u00f3 th\u1ec3 mang \u0111\u01b0\u1ee3c bao nhi\u00eau<\/a> v\u00e0 <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/how-much-to-replace-a-circuit-breaker\/\" rel=\"nofollow\">chi ph\u00ed thay th\u1ebf c\u1ea7u dao<\/a> c\u00e1c con s\u1ed1 gi\u00fap v\u1edbi to\u00e1n h\u1ecdc th\u1ef1c t\u1ebf.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>20 ampe b\u1eb1ng bao nhi\u00eau?<\/h3>\n<p>20 ampe \u1edf 120V t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi c\u00f4ng su\u1ea5t \u0111\u1ea7u ra 2.400 watt (Watt = Ampe \u00d7 Volt). Sau \u0111\u00f3 ch\u00fang ta c\u00f3 4.800W \u1edf 240V. B\u1ed9 ng\u1eaft m\u1ea1ch 20A trong m\u1ea1ch 120V cho ph\u00e9p mang c\u00f4ng su\u1ea5t t\u1ed1i \u0111a 1.920W (theo quy t\u1eafc 80%) ho\u1eb7c th\u1eadm ch\u00ed 2.400W trong ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng li\u00ean t\u1ee5c. 20A t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi c\u00e1c thi\u1ebft b\u1ecb nh\u01b0 l\u00f2 vi s\u00f3ng l\u1edbn (ti\u00eau th\u1ee5 1.000-1.200W \u1edf 120V) ho\u1eb7c \u1ea5m \u0111un \u0111i\u1ec7n v\u00ec \u0111\u00e2y l\u00e0 ch\u1ec9 s\u1ed1 m\u1ea1ch ti\u00eau chu\u1ea9n trong nh\u00e0 b\u1ebfp.<\/p>\n<h3>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 bi\u1ebft nh\u00e0 c\u00f3 100 hay 200 ampe?<\/h3>\n<p>M\u1ed9t c\u00e1ch ch\u1eafc ch\u1eafn \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh l\u01b0\u1ee3ng d\u1ecbch v\u1ee5 \u0111i\u1ec7n b\u1ea1n c\u00f3 l\u00e0 m\u1edf b\u1ea3ng \u0111i\u1ec7n v\u00e0 ki\u1ec3m tra s\u1ed1 \u0111\u01b0\u1ee3c in tr\u00ean b\u1ed9 ng\u1eaft m\u1ea1ch ch\u00ednh c\u1ee7a b\u1ea1n (c\u00f4ng t\u1eafc l\u1edbn n\u1eb1m \u1edf \u0111\u1ea7u b\u1ea3ng). S\u1ed1 n\u00e0y c\u00f3 th\u1ec3 l\u00e0 100, 120, ho\u1eb7c \u0111\u00f4i khi l\u00e0 150 ho\u1eb7c 225. \u0110\u00e1nh gi\u00e1 b\u1ed9 ng\u1eaft m\u1ea1ch ch\u00ednh cho bi\u1ebft k\u00edch th\u01b0\u1edbc d\u1ecbch v\u1ee5 \u0111i\u1ec7n. B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 ki\u1ec3m tra nh\u00e3n tr\u00ean \u0111\u1ebf \u0111\u1ed3ng h\u1ed3 c\u0169ng nh\u01b0 nh\u00e3n b\u00ean trong b\u1ea3ng \u0111i\u1ec7n \u0111\u1ec3 \u01b0\u1edbc l\u01b0\u1ee3ng l\u01b0\u1ee3ng d\u1ecbch v\u1ee5 \u0111\u01b0\u1ee3c cung c\u1ea5p. \u0110i\u1ec7n \u0111\u01b0\u1ee3c cung c\u1ea5p t\u1eeb ti\u1ec7n \u00edch th\u01b0\u1eddng l\u00e0 100A \u1edf c\u00e1c ng\u00f4i nh\u00e0 c\u0169 v\u00e0 200A trong c\u00e1c c\u00f4ng tr\u00ecnh x\u00e2y d\u1ef1ng m\u1edbi.<\/p>\n<h3>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u00f4i t\u00ednh \u0111\u01b0\u1ee3c ampe?<\/h3>\n<p>C\u00f3 ba l\u1ef1a ch\u1ecdn \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n c\u1ea7n bao nhi\u00eau ampe \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng: (1) ki\u1ec3m tra b\u1ea3ng t\u00ean v\u00ec h\u1ea7u h\u1ebft c\u00e1c thi\u1ebft b\u1ecb s\u1ebd li\u1ec7t k\u00ea m\u1ee9c s\u1eed d\u1ee5ng ampe; (2) s\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c Ampe = Watt \u00f7 Volt (d\u00f9ng \u0111\u1ecbnh lu\u1eadt Ohm, I = V \u00f7 R); ho\u1eb7c (3) \u0111o ampe b\u1eb1ng \u0111\u1ed3ng h\u1ed3 \u0111o. L\u1ef1a ch\u1ecdn cu\u1ed1i c\u00f9ng bao g\u1ed3m k\u1eb9p ampe k\u1ebf quanh m\u1ed9t trong c\u00e1c d\u00e2y d\u1eabn d\u00f2ng \u0111i\u1ec7n trong m\u1ea1ch, ho\u1eb7c k\u1ebft n\u1ed1i \u0111\u1ed3ng h\u1ed3 \u0111a n\u0103ng n\u1ed1i ti\u1ebfp v\u1edbi thi\u1ebft b\u1ecb s\u1eed d\u1ee5ng c\u00f4ng su\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i th\u1ea5p. Trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p, b\u1ea3ng t\u00ean ho\u1eb7c t\u00ednh to\u00e1n l\u00e0 \u0111\u1ee7 v\u00e0 an to\u00e0n v\u00ec kh\u00f4ng c\u00f3 nguy hi\u1ec3m.<\/p>\n<h3>5 ampe c\u00f3 gi\u1ed1ng 5 volt kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng \u2014 ch\u00fang \u0111o c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng kh\u00e1c nhau. Ampe \u0111o d\u00f2ng \u0111i\u1ec7n (\u0111i\u1ec7n \u0111ang di chuy\u1ec3n), volt \u0111o \u00e1p su\u1ea5t \u0111i\u1ec7n (ch\u00eanh l\u1ec7ch \u0111i\u1ec7n \u00e1p). N\u0103m ampe l\u00e0 \u0111o d\u00f2ng \u0111i\u1ec7n; n\u0103m volt \u0111o \u00e1p su\u1ea5t. Ngo\u00e0i ra c\u00f4ng su\u1ea5t ch\u00fang cung c\u1ea5p c\u00f9ng nhau t\u00ednh b\u1eb1ng Watt theo c\u00f4ng th\u1ee9c: Watt = Volt * Ampe: 5V * 5A = 25W. Ngu\u1ed3n 5V c\u00f3 th\u1ec3 cung c\u1ea5p d\u00f2ng \u0111i\u1ec7n t\u1eeb microampe \u0111\u1ebfn nhi\u1ec1u ampe t\u00f9y thu\u1ed9c v\u00e0o t\u1ea3i; ampe v\u00e0 volt kh\u00f4ng bao gi\u1edd b\u1eb1ng nhau.<\/p>\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ol>\n<li><a href=\"https:\/\/www.nfpa.org\/codes-and-standards\/nfpa-70-standard-development\" rel=\"nofollow noopener\" target=\"_blank\">NFPA 70 (NEC) \u2014 K\u00edch th\u01b0\u1edbc m\u1ea1ch v\u00e0 Quy t\u1eafc T\u1ea3i li\u00ean t\u1ee5c 80%<\/a><\/li>\n<li><a href=\"https:\/\/www.osha.gov\/electrical\" rel=\"nofollow noopener\" target=\"_blank\">OSHA \u2014 H\u01b0\u1edbng d\u1eabn An to\u00e0n \u0110i\u1ec7n v\u00e0 \u0110o D\u00f2ng \u0111i\u1ec7n<\/a><\/li>\n<li><a href=\"https:\/\/www.fluke.com\/en-us\/learn\/blog\/clamp-meters\" rel=\"nofollow noopener\" target=\"_blank\">Fluke \u2014 C\u00e1ch \u0110o D\u00f2ng \u0111i\u1ec7n b\u1eb1ng \u0110\u1ed3ng h\u1ed3 K\u1eb9p<\/a><\/li>\n<li><a href=\"https:\/\/www.energy.gov\/\" rel=\"nofollow noopener\" target=\"_blank\">B\u1ed9 N\u0103ng l\u01b0\u1ee3ng Hoa K\u1ef3 \u2014 T\u00ednh To\u00e1n C\u00f4ng su\u1ea5t v\u00e0 N\u0103ng l\u01b0\u1ee3ng<\/a><\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">IEC 61010 \u2014 Y\u00eau c\u1ea7u An to\u00e0n cho Thi\u1ebft b\u1ecb \u0110o \u0111i\u1ec7n<\/a><\/li>\n<li><a href=\"https:\/\/www.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">IEC \u2014 \u0110\u01a1n v\u1ecb SI: \u0110\u1ecbnh ngh\u0129a Ampere, Volt v\u00e0 Watt<\/a><\/li>\n<\/ol>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Vi\u1ec7c x\u00e1c \u0111\u1ecbnh d\u00f2ng \u0111i\u1ec7n d\u1ef1a tr\u00ean ba b\u01b0\u1edbc m\u00e0 b\u1ea1n c\u1ea7n bi\u1ebft tr\u01b0\u1edbc: c\u00f3 th\u1ec3 \u0111\u1ecdc b\u1ea3ng t\u00ean thi\u1ebft b\u1ecb (c\u00e1ch nhanh nh\u1ea5t v\u00e0 an to\u00e0n nh\u1ea5t), b\u1ea1n c\u00f3 th\u1ec3 t\u00ednh d\u00f2ng \u0111i\u1ec7n theo c\u00f4ng th\u1ee9c A= (W\/V) (ho\u1eb7c s\u1eed d\u1ee5ng \u0111\u1ecbnh lu\u1eadt Ohm), v\u00e0 b\u1ea1n c\u00f3 th\u1ec3 \u0111o d\u00f2ng \u0111i\u1ec7n v\u1edbi s\u1ef1 tr\u1ee3 gi\u00fap c\u1ee7a \u0111\u1ed3ng h\u1ed3 k\u1eb9p d\u00f2ng (cho m\u1ea1ch \u0111i\u1ec7n \u0111ang ho\u1ea1t \u0111\u1ed9ng, quan tr\u1ecdng l\u00e0 tu\u00e2n th\u1ee7 t\u1ea5t c\u1ea3 c\u00e1c bi\u1ec7n ph\u00e1p an to\u00e0n), ho\u1eb7c \u0111\u1ed3ng h\u1ed3 \u0111a n\u0103ng (cho m\u1ea1ch \u0111i\u1ec7n m\u1ed9t chi\u1ec1u) trong khi gi\u1eef gi\u1edbi h\u1ea1n an to\u00e0n 80%. M\u1ed9t \u0111i\u1ec1u c\u1ea7n nh\u1edb l\u00e0 ampe v\u00e0 volt l\u00e0 hai \u0111\u1ea1i l\u01b0\u1ee3ng kh\u00e1c nhau (trong m\u1ea1ch 20A b\u1ea1n s\u1ebd c\u00f3 2.400W t\u1eeb m\u1ea1ch 120V). Hi\u1ec3u v\u1ec1 d\u00f2ng \u0111i\u1ec7n \u2014 v\u00e0 c\u00e1ch n\u00f3 li\u00ean quan \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 ph\u00eda sau n\u00f3, t\u1eeb nh\u1eefng ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/what-is-mccb-and-mcb\/\" rel=\"nofollow\">MCBs so v\u1edbi MCCBs<\/a> vi\u1ec7c <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/what-is-ul-489-breakers\/\" rel=\"nofollow\">ti\u00eau chu\u1ea9n b\u1ed9 ng\u1eaft UL 489<\/a> \u2014 l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a c\u00f4ng vi\u1ec7c \u0111i\u1ec7n an to\u00e0n.<\/p>","protected":false},"excerpt":{"rendered":"<p>It doesn&#8217;t matter if you are sizing a circuit, diagnosing a breaker that is tripping, choosing your battery, or making a generator purchase the question always returns to amps &#8211; how much current does this actually need? It may sound like it is one thing but when talking about amperage what you really need is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3931,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-3930","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/3930","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/comments?post=3930"}],"version-history":[{"count":2,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/3930\/revisions"}],"predecessor-version":[{"id":3936,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/3930\/revisions\/3936"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media\/3931"}],"wp:attachment":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media?parent=3930"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/categories?post=3930"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/tags?post=3930"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}