{"id":863,"date":"2021-10-07T23:37:02","date_gmt":"2021-10-07T23:37:02","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=863"},"modified":"2021-10-14T22:12:11","modified_gmt":"2021-10-14T15:12:11","slug":"dong-co-dien-mot-chieu-la-gi-ban-co-biet-kien-thuc-vat-ly-9","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/dong-co-dien-mot-chieu-la-gi-ban-co-biet-kien-thuc-vat-ly-9\/","title":{"rendered":"\u0110\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u l\u00e0 g\u00ec b\u1ea1n c\u00f3 bi\u1ebft? Ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 9"},"content":{"rendered":"\n

Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n

Trong kho tang ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 9, b\u00e0i h\u1ecdc v\u1ec1 \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u \u0111\u01b0\u1ee3c ph\u1ed5 bi\u1ebfn v\u00f4 c\u00f9ng k\u1ef9. \u0110i\u1ec1u n\u00e0y gi\u00fap c\u00e1c em h\u1ecdc sinh<\/a> c\u00f3 th\u1ec3 ghi nh\u1edb v\u00e0 v\u1eadn d\u1ee5ng m\u1ed9t c\u00e1ch thu\u1ea7n th\u1ee5c. Ngo\u00e0i ki\u1ebfn th\u1ee9c tr\u00ean l\u1edbp, t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 ngu\u1ed3n ki\u1ebfn th\u1ee9c m\u1edf r\u1ed9ng c\u0169ng l\u00e0 c\u00e1ch \u0111\u1ec3 c\u00e1c em h\u1ecdc sinh<\/a> hi\u1ec3u b\u00e0i h\u01a1n. Nh\u1eefng ai mu\u1ed1n t\u00ecm t\u00f2i th\u00eam nhi\u1ec1u th\u00f4ng tin v\u1ec1 v\u1eadt l\u00fd c\u0169ng n\u00ean \u0111\u1ecdc th\u00eam b\u00e0i vi\u1ebft n\u00e0y. Tin r\u1eb1ng nh\u1eefng th\u00f4ng tin m\u00e0 ch\u00fang t\u00f4i mang \u0111\u1ebfn s\u1ebd l\u00e0m cho b\u1ea1n th\u1ea5y h\u00e0i l\u00f2ng. C\u00f9ng t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u ngay th\u00f4i n\u00e0o.<\/p>\n\n\n\n

C\u00e1ch l\u00e0m \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u \u0111\u01a1n gi\u1ea3n<\/p>\n\n\n\n

\u0110\u1ecbnh ngh\u0129a c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u<\/p>\n\n\n\n

R\u1ea5t nhi\u1ec1u ng\u01b0\u1eddi ch\u01b0a n\u1eafm r\u00f5 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a c\u1ee7a \u0111\u1ed9ng c\u01a1 1 chi\u1ec1u. \u0110\u1ed9ng c\u01a1 m\u1ed9t chi\u1ec1u DC \u2013 \u0111\u01b0\u1ee3c vi\u1ebft t\u1eaft c\u1ee7a Direct Current Motors. \u0110\u00e2y l\u00e0 \u0111\u1ed9ng c\u01a1 \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n b\u1eb1ng d\u00f2ng, v\u1edbi h\u01b0\u1edbng x\u00e1c \u0111\u1ecbnh. Hay theo c\u00e1ch n\u00f3i kh\u00e1c, ch\u00fang l\u00e0 lo\u1ea1i \u0111\u1ed9ng c\u01a1 ch\u1ea1y b\u1eb1ng ngu\u1ed3n \u0111i\u1ec7n \u00e1p DC \u2013 \u0111i\u1ec7n \u00e1p c\u00f3 1 chi\u1ec1u.<\/p>\n\n\n\n

Ch\u1ed1t l\u1ea1i, \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u l\u00e0 \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n \u0111\u01b0\u1ee3c ho\u1ea1t \u0111\u1ed9ng v\u1edbi d\u00f2ng \u0111i\u1ec7n c\u00f3 1 chi\u1ec1u.<\/p>\n\n\n\n

C\u1ea5u t\u1ea1o \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u c\u00f3 nh\u1eefng g\u00ec?<\/p>\n\n\n\n

Th\u1ef1c t\u1ebf, c\u1ea5u t\u1ea1o \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u kh\u00f4ng qu\u00e1 ph\u1ee9c t\u1ea1p. Ch\u00fang bao g\u1ed3m nh\u1eefng thi\u1ebft b\u1ecb ch\u00ednh sau \u0111\u00e2y:<\/p>\n\n\n\n

  Rotor: \u0111\u00e2y l\u00e0 b\u1ed9 ph\u1eadn ch\u00ednh, c\u00f3 c\u1ea5u t\u1ea1o tr\u1ee5c v\u00e0 \u0111\u01b0\u1ee3c qu\u1ea5n c\u00e1c cu\u1ed9n d\u00e2y l\u1ea1i v\u1edbi nhau. Nh\u1edd vi\u1ec7c n\u00e0y s\u1ebd t\u1ea1o n\u00ean \u0111\u01b0\u1ee3c m\u1ed9t chi\u1ebfc nam ch\u00e2m \u0111i\u1ec7n.\n\n  Stator: b\u1ed9 ph\u1eadn n\u00e0y c\u00f3 k\u1ebft c\u1ea5u gi\u1ed1ng v\u1edbi m\u1ed9t chi\u1ebfc nam ch\u00e2m v\u0129nh c\u1eedu, ho\u1eb7c nam ch\u00e2m \u0111i\u1ec7n. Nh\u1edd \u0111\u00f3 ch\u00fang s\u1ebd ho\u1ea1t \u0111\u1ed9ng v\u1edbi c\u00f4ng d\u1ee5ng t\u01b0\u01a1ng \u0111\u01b0\u01a1ng.\n\n  C\u1ed5 g\u00f3p hay c\u00f2n g\u1ecdi l\u00e0 Commutator. \u0110\u00e2y l\u00e0 n\u01a1i ti\u1ebfp x\u00fac v\u00e0 c\u00f3 th\u1ec3 truy\u1ec1n \u0111i\u1ec7n t\u1edbi cho c\u00e1c cu\u1ed9n d\u00e2y \u1edf tr\u00ean rotor. S\u1ed1 \u0111i\u1ec3m ti\u1ebfp x\u00fac \u1edf tr\u00ean c\u1ed5 g\u00f3p s\u1ebd t\u01b0\u01a1ng \u1ee9ng v\u1edbi s\u1ed1 d\u00e2y \u0111\u01b0\u1ee3c qu\u1ea5n \u1edf tr\u00ean b\u1ed9 ph\u1eadn Rotor.\n\n  Ch\u1ed5i than hay c\u00f2n g\u1ecdi l\u00e0 Brushes. \u0110\u00e2y l\u00e0 n\u01a1i ti\u1ebfp x\u00fac v\u00e0 c\u00f3 th\u1ec3 ti\u1ebfp \u0111i\u1ec7n \u0111\u01b0\u1ee3c cho b\u1ed9 ph\u1eadn c\u1ed5 g\u00f3p<\/code><\/pre>\n\n\n\n
Chia s\u1ebb v\u1ec1 \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u<\/p>\n\n\n\n
\u0110\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u c\u00f3 nh\u1eefng d\u00f2ng ch\u00ednh n\u00e0o?<\/p>\n\n\n\n
C\u0103n c\u1ee9 v\u00e0o ph\u01b0\u01a1ng ph\u00e1p k\u00edch t\u1eeb, ta c\u00f3 th\u1ec3 chia \u0111\u01b0\u1ee3c \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n n\u00e0y th\u00e0nh nh\u1eefng d\u00f2ng ch\u00ednh nh\u01b0 sau:<\/p>\n\n\n\n
  \u0110\u1ed9ng c\u01a1 m\u1ed9t chi\u1ec1u \u0111\u01b0\u1ee3c k\u00edch t\u1eeb song song. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 hi\u1ec3u l\u00e0 cu\u1ed9n d\u00e2y k\u00edch t\u1eeb v\u00e0 n\u1ed1i song song l\u1ea1i v\u1edbi ph\u1ea7n \u1ee9ng.\n\n  \u0110\u1ed9ng c\u01a1 1 chi\u1ec1u v\u00e0 \u0111\u01b0\u1ee3c k\u00edch t\u1eeb \u0111\u1ed9c l\u1eadp. C\u00f3 ngh\u0129a l\u00e0 ph\u1ea7n \u1ee9ng v\u1edbi ph\u1ea7n k\u00edch t\u1eeb s\u1ebd \u0111\u1ebfn t\u1eeb hai ngu\u1ed3n ri\u00eang l\u1ebb.\n\n  \u0110\u1ed9ng c\u01a1 1 chi\u1ec1u k\u00edch t\u1eeb h\u1ed7n h\u1ee3p. V\u1edbi ph\u1ea7n \u0111\u1ed9ng c\u01a1 n\u00e0y, c\u1ea5u t\u1ea1o s\u1ebd c\u00f3 2 cu\u1ed9n d\u00e2y k\u00edch t\u1eeb, ngo\u00e0i ra c\u00f3 m\u1ed9t cu\u1ed9n \u0111\u1ec3 n\u1ed1i song song v\u1edbi ph\u1ea7n \u1ee9ng, v\u00e0 m\u1ed9t cu\u1ed9n s\u1ebd n\u1ed1i ti\u1ebfp v\u1edbi ph\u1ea7n \u1ee9ng.\n\n  Thi\u1ebft b\u1ecb \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u c\u00f3 k\u00edch t\u1eeb n\u1ed1i ti\u1ebfp. L\u00fac n\u00e0y, cu\u1ed9n k\u00edch t\u1eeb s\u1ebd \u0111\u01b0\u1ee3c m\u1eafc n\u1ed1i ti\u1ebfp v\u00e0o ph\u1ea7n \u1ee9ng.<\/code><\/pre>\n\n\n\n
Nguy\u00ean t\u1eafc ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u l\u00e0 g\u00ec?<\/p>\n\n\n\n
Nhi\u1ec1u ng\u01b0\u1eddi kh\u00f4ng bi\u1ebft nguy\u00ean t\u1eafc ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u l\u00e0 g\u00ec. \u0110\u1ea7u ti\u00ean, Stato c\u1ee7a \u0111\u1ed9ng c\u01a1 1 chi\u1ec1u th\u01b0\u1eddng s\u1ebd l\u00e0 m\u1ed9t ho\u1eb7c v\u00e0i c\u1eb7p nam ch\u00e2m v\u0129nh c\u1eedu, ho\u1eb7c nam ch\u00e2m \u0111i\u1ec7n. Ph\u1ea7n rotor s\u1ebd \u0111\u01b0\u1ee3c cu\u1ed1n c\u00e1c cu\u1ed9n d\u00e2y, k\u1ebft n\u1ed1i tr\u1ef1c ti\u1ebfp v\u1edbi ngu\u1ed3n \u0111i\u1ec7n 1 chi\u1ec1u. Ph\u1ea7n quan tr\u1ecdng kh\u00e1c c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n kh\u00f4ng th\u1ec3 kh\u00f4ng nh\u1eafc \u0111\u1ebfn, ch\u00ednh l\u00e0 ph\u1ea7n b\u1ed9 ph\u1eadn ch\u1ec9nh l\u01b0u. Nhi\u1ec7m v\u1ee5 c\u1ee7a b\u1ed9 ph\u1eadn n\u00e0y ch\u00ednh l\u00e0 \u0111\u1ed5i chi\u1ec1u b\u00ean trong d\u00f2ng \u0111i\u1ec7n. T\u1eeb \u0111\u00f3 gi\u00fap cho rotor duy tr\u00ec \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed9ng quay li\u00ean t\u1ee5c.<\/p>\n\n\n\n
Khi tr\u1ee5c c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u \u0111\u01b0\u1ee3c k\u00e9o b\u1eb1ng m\u1ed9t l\u1ef1c ngo\u00e0i, \u0111\u1ed9ng c\u01a1 n\u00e0y s\u1ebd ho\u1ea1t \u0111\u1ed9ng gi\u1ed1ng m\u00e1y ph\u00e1t \u0111i\u1ec7n m\u1ed9t chi\u1ec1u. T\u1eeb \u0111\u00f3, ch\u00fang t\u1ea1o ra su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng c\u1ea3m \u1ee9ng. Su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng n\u00e0y c\u00f3 t\u00ean l\u00e0 Electromotive Force. Khi v\u1eadn h\u00e0nh \u1edf ch\u1ebf \u0111\u1ed9 c\u01a1 b\u1ea3n, rotor s\u1ebd quay v\u00e0 ph\u00e1t ra \u0111i\u1ec7n \u00e1p. \u0110i\u1ec7n \u00e1p n\u00e0y c\u00f3 t\u00ean l\u00e0 s\u1ee9c ph\u1ea3n \u0111i\u1ec7n \u0111\u1ed9ng Counter EMF ho\u1eb7c g\u1ecdi s\u1ee9c \u0111i\u1ec7n \u0111\u1ed9ng \u0111\u1ed1i kh\u00e1ng. L\u00fd do l\u00e0 b\u1edfi ch\u00fang \u0111\u1ed1i kh\u00e1ng v\u1edbi \u0111i\u1ec7n \u00e1p \u0111\u01b0\u1ee3c \u0111\u1eb7t b\u00ean ngo\u00e0i v\u00e0o \u0111\u1ed9ng c\u01a1.<\/p>\n\n\n\n
T\u00ecm hi\u1ec3u th\u00eam v\u1ec1 \u1ee9ng d\u1ee5ng c\u1ee7a nam ch\u00e2m v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb<\/p><\/blockquote>\n\n\n\n
\u0110\u00e1nh gi\u00e1 s\u1ee9c \u0111i\u1ec7n \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/p>\n\n\n\n
S\u1ee9c \u0111i\u1ec7n \u0111\u1ed9ng n\u00e0y \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 t\u01b0\u01a1ng t\u1ef1 nh\u01b0 s\u1ee9c \u0111i\u1ec7n \u0111\u1ed9ng ph\u00e1t ra khi \u0111\u1ed9ng c\u01a1 s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t m\u00e1y ph\u00e1t \u0111i\u1ec7n. Do \u0111\u00f3, \u0111i\u1ec7n \u00e1p \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf tr\u00ean \u0111\u1ed9ng c\u01a1 s\u1ebd bao g\u1ed3m 2 th\u00e0nh ph\u1ea7n ch\u00ednh. \u0110\u00f3 l\u00e0: s\u1ee9c ph\u1ea3n \u0111i\u1ec7n \u0111\u1ed9ng v\u00e0 \u0111i\u1ec7n \u00e1p gi\u00e1ng. Ch\u00fang \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi \u0111i\u1ec7n tr\u1edf n\u1ed9i c\u1ee7a c\u00e1c cu\u1ed9n d\u00e2y ph\u1ea3n \u1ee9ng. Khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua thi\u1ebft b\u1ecb \u0111i\u1ec7n, s\u1ebd c\u00f3 c\u00f4ng th\u1ee9c nh\u01b0 sau:<\/p>\n\n\n\n
I=(Vnguon-Vphandiendong)\/Rphanung<\/p>\n\n\n\n
C\u00f4ng su\u1ea5t c\u01a1 c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111\u01b0a ra s\u1ebd t\u00ednh b\u1eb1ng:<\/p>\n\n\n\n
P=I*Vphandiendong<\/p>\n\n\n\n
H\u00ecnh m\u1eabu \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u<\/p>\n\n\n\n
\u1ee8ng d\u1ee5ng c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u l\u00e0 g\u00ec?<\/p>\n\n\n\n
  Nhi\u1ec1u ng\u01b0\u1eddi quan t\u00e2m kh\u00f4ng bi\u1ebft \u1ee9ng d\u1ee5ng c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u l\u00e0 g\u00ec. Thi\u1ebft b\u1ecb \u0111\u1ed9ng c\u01a1 n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong r\u1ea5t nhi\u1ec1u t\u00ecnh hu\u1ed1ng kh\u00e1c nhau.\n\n  S\u1eed d\u1ee5ng trong c\u00e1c m\u00e1y c\u00f4ng c\u1ee5 l\u1edbn. \u0110\u00e2y l\u00e0 nh\u1eefng thi\u1ebft b\u1ecb c\u1ea7n ph\u1ea3i c\u00f3 t\u1ed1c \u0111\u1ed9 v\u00e0 s\u1ed1 v\u00f2ng quay \u0111\u1ea1t y\u00eau c\u1ea7u cao. Nh\u01b0 v\u1eady, ch\u1ec9 c\u00f3 \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u l\u00e0 c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng \u0111\u01b0\u1ee3c \u0111\u1ec3 s\u1eed d\u1ee5ng.\n\n  S\u1eed d\u1ee5ng trong nh\u1eefng xe m\u00f4 h\u00ecnh, \u1ee9ng d\u1ee5ng \u0111\u1ed3 ch\u01a1i, \u0111\u1ed9ng c\u01a1 s\u1eed d\u1ee5ng pin. \u0110\u00e2y l\u00e0 nh\u1eefng thi\u1ebft b\u1ecb th\u01b0\u1eddng s\u1eed d\u1ee5ng lo\u1ea1i \u0111\u1ed9ng c\u01a1 m\u1ed9t chi\u1ec1u n\u00e0y. \u0110\u00e2y \u0111\u1ec1u l\u00e0 nh\u1eefng s\u1ea3n ph\u1ea9m b\u00e1n ch\u1ea1y v\u00e0 ph\u1ed5 bi\u1ebfn tr\u00ean th\u1ecb tr\u01b0\u1eddng. Th\u1ebf n\u00ean kh\u00f4ng kh\u00f3 \u0111\u1ec3 b\u1ea1n c\u00f3 th\u1ec3 b\u1eaft g\u1eb7p c\u00e1c thi\u1ebft b\u1ecb 1 chi\u1ec1u n\u00e0y \u0111\u00e2u.\n\n  \u1ee8ng d\u1ee5ng trong c\u00e1c m\u00e1y m\u00f3c ph\u1ee5c v\u1ee5 \u0111\u1eddi s\u1ed1ng con ng\u01b0\u1eddi. C\u00f3 th\u1ec3 k\u1ebf \u0111\u1ebfn s\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u b\u00ean trong c\u00e1c thi\u1ebft b\u1ecb nh\u01b0 m\u00e1y photocopy, \u1ed5 \u0111\u0129a, loa\u2026<\/code><\/pre>\n\n\n\n
Thi\u1ebft b\u1ecb \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u c\u00f3 \u01b0u v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m g\u00ec?<\/p>\n\n\n\n
Thi\u1ebft k\u1ebf<\/a> \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u r\u1ea5t ti\u1ec7n d\u1ee5ng v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng linh ho\u1ea1t trong \u0111\u1eddi s\u1ed1ng c\u1ee7a con ng\u01b0\u1eddi. V\u1eady b\u1ea1n c\u00f3 bi\u1ebft ch\u00fang c\u00f3 \u01b0u \u0111i\u1ec3m hay l\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m g\u00ec kh\u00f4ng?<\/p>\n\n\n\n
\u01afu \u0111i\u1ec3m c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u<\/p>\n\n\n\n
  C\u00f3 moment m\u1edf m\u00e1y l\u1edbn, c\u00f3 th\u1ec3 k\u00e9o \u0111\u01b0\u1ee3c t\u1ea3i n\u1eb7ng trong qu\u00e1 tr\u00ecnh kh\u1edfi \u0111\u1ed9ng. B\u1edfi th\u1ebf, ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u0111\u1ea7u m\u00e1y k\u00e9o. C\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng \u0111\u00e2y l\u00e0 \u01b0u \u0111i\u1ec3m n\u1ed5i b\u1eadt nh\u1ea5t c\u1ee7a \u0111\u1ed9ng c\u01a1 1 chi\u1ec1u n\u00e0y.\n\n  C\u00f3 kh\u1ea3 n\u0103ng \u0111i\u1ec1u ch\u1ec9nh \u0111\u01b0\u1ee3c qu\u00e1 t\u1ea3i, c\u0169ng nh\u01b0 t\u1ed1c \u0111\u1ed9 t\u1ed1t h\u01a1n so v\u1edbi nh\u1eefng thi\u1ebft b\u1ecb kh\u00e1c.\n\n  Thi\u1ebft b\u1ecb \u0111\u1ed9ng c\u01a1 m\u1ed9t chi\u1ec1u \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 l\u00e0 c\u00f3 kh\u1ea3 n\u0103ng \u0111i\u1ec1u ch\u1ec9nh t\u1ed1c \u0111\u1ed9 v\u00e0 qu\u00e1 t\u1ea3i r\u1ea5t t\u1ed1t.\n\n  Ngo\u00e0i ra, s\u1eed d\u1ee5ng \u0111\u1ed9ng c\u01a1 m\u1ed9t chi\u1ec1u l\u00e2u d\u00e0i c\u00f3 th\u1ec3 ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c \u0111i\u1ec7n n\u0103ng. \u0110i\u1ec1u n\u00e0y r\u1ea5t t\u1ed1t n\u1ebfu nh\u01b0 b\u1ea1n mu\u1ed1n \u0111\u1ea7u t\u01b0 v\u00e0 s\u1eed d\u1ee5ng trong m\u1ed9t qu\u00e3ng th\u1eddi gian kh\u00f4ng ng\u1eafn.\n\n  B\u1ec1n b\u1ec9, \u0111\u01b0\u1ee3c nhi\u1ec1u ng\u01b0\u1eddi s\u1eed d\u1ee5ng v\u00e0 \u0111\u00e1nh gi\u00e1 cao. Tu\u1ed5i th\u1ecd l\u1edbn c\u0169ng l\u00e0 \u0111\u1eb7c \u0111i\u1ec3m gi\u00fap cho ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng lo ph\u1ea3i thay m\u1edbi th\u01b0\u1eddng xuy\u00ean m\u1ed9t khi \u0111\u00e3 t\u00ecm mua.<\/code><\/pre>\n\n\n\n
Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u<\/p>\n\n\n\n
D\u00f9 \u0111\u01b0\u1ee3c n\u00eau ra nh\u01b0 c\u00f3 nhi\u1ec1u \u01b0u \u0111i\u1ec3m, nh\u01b0ng c\u0169ng kh\u00f4ng tr\u00e1nh kh\u1ecfi thi\u1ebft b\u1ecb \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u n\u00e0y c\u00f3 m\u1ed9t s\u1ed1 nh\u01b0\u1ee3c \u0111i\u1ec3m nh\u1ea5t \u0111\u1ecbnh.<\/p>\n\n\n\n
  B\u1ed9 ph\u1eadn c\u1ed5 g\u00f3p c\u00f3 c\u1ea5u t\u1ea1o kh\u00e1 ph\u1ee9c t\u1ea1p. Gi\u00e1 th\u00e0nh \u0111\u1eaft \u0111\u1ecf v\u00e0 ch\u00fang c\u00f3 th\u1ec3 b\u1ecb h\u01b0 h\u1ecfng trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh. Do v\u1eady ch\u00fang c\u1ea7n b\u1ea3o d\u01b0\u1ee1ng v\u00e0 s\u1eefa ch\u1eefa c\u1ea9n th\u1eadn nh\u1ea5t c\u00f3 th\u1ec3.\n\n  Tia l\u1eeda \u0111i\u1ec7n c\u00f3 th\u1ec3 b\u1ecb ph\u00e1t sinh \u1edf tr\u00ean c\u1ed5 g\u00f3p v\u00e0 ch\u1ed5i than, do \u0111\u00f3 ch\u00fang c\u00f3 th\u1ec3 g\u00e2y ra nguy hi\u1ec3m. N\u1ebfu s\u1eed d\u1ee5ng trong \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng d\u1ec5 ch\u00e1y n\u1ed5, d\u1ec5 g\u1eb7p ph\u1ea3i hi\u1ec7n t\u01b0\u1ee3ng kh\u00f4ng mong mu\u1ed1n.\n\n  C\u00f4ng su\u1ea5t kh\u00f4ng cao d\u00f9 cho gi\u00e1 th\u00e0nh b\u1ecf ra kh\u00e1 \u0111\u1eaft \u0111\u1ecf. Th\u1ebf n\u00ean tr\u01b0\u1edbc khi quy\u1ebft \u0111\u1ecbnh mua hay kh\u00f4ng, b\u1ea1n n\u00ean suy ngh\u0129 v\u00e0 l\u1ef1a ch\u1ecdn th\u1eadt k\u1ef9 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u00ecnh kh\u00f4ng b\u1ecb mua h\u1edb. T\u00ednh to\u00e1n xem n\u00f3 c\u00f3 th\u1eadt s\u1ef1 h\u1ee3p v\u1edbi m\u00ecnh kh\u00f4ng, v\u00e0 c\u00e2n nh\u1eafc gi\u1eefa \u01b0u \u0111i\u1ec3m v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m b\u1ea1n nh\u00e9.<\/code><\/pre>\n\n\n\n
Ph\u00e2n lo\u1ea1i \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n 1 chi\u1ec1u<\/p>\n\n\n\n
Tr\u00ean \u0111\u00e2y l\u00e0 nh\u1eefng th\u00f4ng tin m\u00e0 ch\u00fang t\u00f4i cung c\u1ea5p cho b\u1ea1n \u0111\u1ecdc v\u1ec1 \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u. Nh\u1eefng \u0111\u1ecbnh ngh\u0129a, \u1ee9ng d\u1ee5ng c\u0169ng nh\u01b0 \u01b0u nh\u01b0\u1ee3c \u0111i\u1ec3m m\u00e0 ch\u00fang t\u00f4i chia s\u1ebb ch\u1eafc ch\u1eafn s\u1ebd khi\u1ebfn b\u1ea1n h\u00e0i l\u00f2ng. H\u00e3y tham kh\u1ea3o th\u1eadt k\u1ef9 \u0111\u1ec3 c\u00f3 th\u1ec3 hi\u1ec3u h\u01a1n v\u1ec1 c\u00f4ng c\u1ee5 n\u00e0y b\u1ea1n nh\u00e9. \u0110\u1eebng qu\u00ean tham kh\u1ea3o b\u00e0i vi\u1ebft kh\u00e1c v\u1ec1 nam ch\u00e2m tr\u00ean website c\u1ee7a ch\u00fang t\u00f4i \u0111\u1ec3 bi\u1ebft th\u00eam chi ti\u1ebft!<\/p>\n\n\n\n
Kh\u00e1m ph\u00e1 th\u00eam nh\u1eefng ch\u1ee7 \u0111\u1ec1 m\u1edbi<\/p><\/blockquote>\n\n\n\n
Ch\u1ea5t d\u1eabn \u0111i\u1ec7n v\u00e0 ch\u1ea5t c\u00e1ch \u0111i\u1ec7n l\u00e0 g\u00ec? Ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 7<\/p>\n\n\n\n
\u0110i\u1ec7n th\u1ebf hi\u1ec7u \u0111i\u1ec7n th\u1ebf \u2013 Kh\u00e1i ni\u1ec7m v\u00e0 c\u00f4ng th\u1ee9c chi ti<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Trong kho tang ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 9, b\u00e0i h\u1ecdc v\u1ec1 \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n m\u1ed9t chi\u1ec1u \u0111\u01b0\u1ee3c ph\u1ed5 bi\u1ebfn v\u00f4 c\u00f9ng k\u1ef9. \u0110i\u1ec1u n\u00e0y gi\u00fap c\u00e1c em h\u1ecdc sinh c\u00f3 th\u1ec3 ghi nh\u1edb v\u00e0 v\u1eadn d\u1ee5ng m\u1ed9t c\u00e1ch thu\u1ea7n th\u1ee5c. Ngo\u00e0i ki\u1ebfn th\u1ee9c tr\u00ean l\u1edbp, t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[4,7],"tags":[],"class_list":["post-863","post","type-post","status-publish","format-standard","hentry","category-trung-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/863","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=863"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/863\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=863"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=863"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}