Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n
Ch\u00fang ta \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00ecm hi\u1ec3u v\u1ec1 \u0111i\u1ec7n n\u0103ng trong c\u00e1c b\u00e0i h\u1ecdc v\u1eadt l\u00fd. Tuy nhi\u00ean \u0111i\u1ec7n n\u0103ng kh\u00f4ng h\u1ec1 t\u1ed3n t\u1ea1i duy nh\u1ea5t. Khi \u0111i\u1ec7n n\u0103ng sinh ra, \u0111i\u1ec7n n\u0103ng c\u00f2n c\u00f3 th\u1ec3 bi\u1ebfn \u0111\u1ed5i sang c\u00e1c d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng kh\u00e1c. \u0110i\u1ec1u n\u00e0y c\u00f3 \u00fd ngh\u0129a nh\u01b0 th\u1ebf n\u00e0o? T\u1ea1i sao khi nh\u1eafc \u0111\u1ebfn \u0111i\u1ec7n n\u0103ng ng\u01b0\u1eddi ta l\u1ea1i n\u00f3i v\u1ec1 \u0111\u1ecbnh lu\u1eadt Jun lenxo? Ch\u00fang ta h\u00e3y c\u00f9ng nhau t\u00ecm hi\u1ec3u v\u00e0 gi\u1ea3i \u0111\u00e1p v\u1ea5n \u0111\u1ec1 v\u1eadt l\u00fd n\u00e0y trong b\u00e0i vi\u1ebft ng\u00e0y h\u00f4m nay nh\u00e9!<\/p>\n\n\n\n
\u0110i\u1ec7n n\u0103ng l\u00e0 g\u00ec?<\/p>\n\n\n\n
Tr\u01b0\u1edbc khi \u0111\u1ebfn v\u1edbi \u0111\u1ecbnh lu\u1eadt Jun lenxo g\u1eafn li\u1ec1n v\u1edbi \u0111i\u1ec7n n\u0103ng, th\u00ec tr\u01b0\u1edbc h\u1ebft ch\u00fang ta c\u1ea7n hi\u1ec3u \u0111i\u1ec7n n\u0103ng l\u00e0 g\u00ec? \u0110i\u1ec7n n\u0103ng ch\u00ednh l\u00e0 n\u0103ng l\u01b0\u1ee3ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n. \u0110\u00e2y ch\u00ednh l\u00e0 \u0111\u1ecbnh ngh\u0129a v\u00f4 c\u00f9ng \u0111\u01a1n gi\u1ea3n v\u1ec1 ch\u1ee7 \u0111\u1ec1 n\u00e0y. Tuy nhi\u00ean, ch\u00fang ta c\u1ea7n ph\u1ea3i nh\u1edb, d\u00f2ng \u0111i\u1ec7n lu\u00f4n \u0111em theo n\u0103ng l\u01b0\u1ee3ng. B\u1edfi l\u1ebd, n\u00f3 c\u00f3 kh\u1ea3 n\u0103ng th\u1ef1c hi\u1ec7n c\u00f4ng c\u0169ng nh\u01b0 nhi\u1ec7t n\u0103ng c\u1ee7a v\u1eadt. N\u1ebfu nh\u01b0 ch\u00fang ta kh\u00f4ng t\u00ecm hi\u1ec3u v\u1ec1 \u0111i\u1ec7n n\u0103ng, c\u00f3 th\u1ec3 ch\u00fang ta s\u1ebd kh\u00f4ng bao gi\u1edd bi\u1ebft \u0111\u1ebfn \u0111i\u1ec1u n\u00e0y.<\/p>\n\n\n\n
\u0110i\u1ec7n n\u0103ng c\u00f3 vai tr\u00f2 quan tr\u1ecdng trong cu\u1ed9c s\u1ed1ng<\/p>\n\n\n\n
T\u1ea1i sao ch\u00fang ta l\u1ea1i n\u00f3i \u0111i\u1ec7n n\u0103ng c\u00f3 th\u1ec3 l\u00e0m thay \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9 c\u1ee7a v\u1eadt? \u0110i\u1ec1u n\u00e0y ch\u00ednh l\u00e0 t\u00ednh ch\u1ea5t c\u1ee7a \u0111i\u1ec7n n\u0103ng. Ch\u00fang ta c\u00f3 th\u1ec3 th\u1ea5y hi\u1ec7n t\u01b0\u1ee3ng c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n b\u1ecb n\u00f3ng l\u00ean khi s\u1eed d\u1ee5ng l\u00e2u. \u0110\u00e2y ch\u00ednh l\u00e0 t\u00ednh ch\u1ea5t \u0111i\u1ec7n n\u0103ng c\u00f3 th\u1ec3 l\u00e0m thay \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9 c\u1ee7a v\u1eadt. Khi d\u00f2ng \u0111i\u1ec7n \u0111i qua v\u1eadt, sinh ra \u0111i\u1ec7n n\u0103ng. \u0110\u1ed3ng th\u1eddi c\u0169ng \u0111em \u0111\u1ebfn nh\u1eefng n\u0103ng l\u01b0\u1ee3ng kh\u00e1c cho v\u1eadt. Ch\u00fang ta h\u00e3y c\u00f9ng nhau t\u00ecm hi\u1ec3u v\u1ec1 \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a \u0111i\u1ec7n n\u0103ng \u0111\u1ec3 r\u00f5 h\u01a1n v\u1ec1 \u0111i\u1ec1u n\u00e0y nh\u00e9!<\/p>\n\n\n\n
\u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a \u0111i\u1ec7n n\u0103ng<\/p>\n\n\n\n
Nh\u01b0 ch\u00fang ta \u0111\u00e3 bi\u1ebft \u201cn\u0103ng l\u01b0\u1ee3ng kh\u00f4ng t\u1ef1 nhi\u00ean sinh ra v\u00e0 m\u1ea5t \u0111i, ch\u00fang ch\u1ec9 chuy\u1ec3n t\u1eeb lo\u1ea1i n\u00e0y sang lo\u1ea1i kh\u00e1c\u201d. \u0110\u1ed1i v\u1edbi \u0111i\u1ec7n n\u0103ng c\u0169ng v\u1eady. Khi \u0111i\u1ec7n n\u0103ng sinh ra qu\u00e1 nhi\u1ec1u, c\u0169ng c\u00f3 s\u1ef1 chuy\u1ec3n bi\u1ebfn sang d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng kh\u00e1c. \u0110i\u1ec7n n\u0103ng c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a th\u00e0nh c\u00e1c d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng c\u00f3 \u00edch, ho\u1eb7c v\u00f4 \u00edch. Tuy nhi\u00ean, v\u1eabn c\u00f3 s\u1ef1 chuy\u1ec3n h\u00f3a n\u0103ng l\u01b0\u1ee3ng \u1edf \u0111i\u1ec7n n\u0103ng.<\/p>\n\n\n\n
V\u1edbi v\u00ed d\u1ee5 ph\u00eda tr\u00ean, khi thi\u1ebft b\u1ecb \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng qu\u00e1 l\u00e2u g\u00e2y ra nhi\u1ec7t. Th\u00ec \u1edf \u0111\u00e2y ta n\u00f3i, \u0111i\u1ec7n n\u0103ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n \u0111\u00e3 chuy\u1ec3n h\u00f3a m\u1ed9t ph\u1ea7n th\u00e0nh nhi\u1ec7t n\u0103ng. C\u00e1c nh\u00e0 v\u1eadt l\u00fd h\u1ecdc \u0111\u00e3 nghi\u00ean c\u1ee9u v\u00e0 cho ra c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ednh hi\u1ec7u su\u1ea5t c\u1ee7a \u0111i\u1ec7n n\u0103ng. T\u1ec9 s\u1ed1 ph\u1ea7n tr\u0103m n\u0103ng l\u01b0\u1ee3ng c\u00f3 \u00edch \u0111\u01b0\u1ee3c chuy\u1ec3n h\u00f3a t\u1eeb \u0111i\u1ec7n n\u0103ng v\u00e0 to\u00e0n b\u1ed9 \u0111i\u1ec7n n\u0103ng \u0111\u01b0\u1ee3c ti\u00eau th\u1ee5 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 hi\u1ec7u su\u1ea5t s\u1eed d\u1ee5ng \u0111i\u1ec7n n\u0103ng. Ch\u00fang ta c\u00f3 c\u00f4ng th\u1ee9c sau \u0111\u00e2y:<\/p>\n\n\n\n
H = Ai\/ Atp<\/p>\n\n\n\n
Trong \u0111\u00f3 H ch\u00ednh l\u00e0 hi\u1ec7u su\u1ea5t s\u1eed d\u1ee5ng \u0111i\u1ec7n n\u0103ng. Ai ch\u00ednh l\u00e0 c\u00f4ng c\u1ee7a n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n n\u0103ng c\u00f3 \u00edch. Atp ch\u00ednh l\u00e0 c\u00f4ng c\u1ee7a n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n n\u0103ng to\u00e0n ph\u1ea7n d\u00f2ng \u0111i\u1ec7n s\u1eed d\u1ee5ng. C\u00f4ng th\u1ee9c n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng kh\u00e1 nhi\u1ec1u trong ch\u1ee7 \u0111\u1ec1 \u0111\u1ecbnh lu\u1eadt Jun lenxo. C\u00e1c em c\u1ea7n bi\u1ebft \u0111\u1ebfn c\u00f4ng th\u1ee9c n\u00e0y tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 \u0111\u1ecbnh lu\u1eadt \u0111\u00f3.<\/p>\n\n\n\n
\u0110i\u1ec7n n\u0103ng bi\u1ebfn \u0111\u1ed5i th\u00e0nh nhi\u1ec7t n\u0103ng<\/p>\n\n\n\n
Nh\u01b0 ch\u00fang ta \u0111\u00e3 l\u1ea5y v\u00ed d\u1ee5 \u1edf ph\u00eda tr\u00ean, \u0111i\u1ec7n n\u0103ng kh\u00f4ng ch\u1ec9 d\u00f9ng to\u00e0n b\u1ed9 cho thi\u1ebft b\u1ecb \u0111i\u1ec7n. M\u00e0 m\u1ed9t ph\u1ea7n \u0111i\u1ec7n n\u0103ng sinh ra c\u00f3 th\u1ec3 bi\u1ebfn \u0111\u1ed5i sang d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng kh\u00e1c. Nhi\u1ec7t n\u0103ng ch\u00ednh l\u00e0 d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng th\u01b0\u1eddng th\u1ea5y \u0111\u01b0\u1ee3c bi\u1ebfn \u0111\u1ed5i t\u1eeb nhi\u1ec7t n\u0103ng.<\/p>\n\n\n\n
\u0110i\u1ec7n n\u0103ng bi\u1ebfn \u0111\u1ed5i th\u00e0nh nhi\u1ec7t n\u0103ng<\/p>\n\n\n\n
Ch\u00fang ta c\u00f3 th\u1ec3 th\u1ea5y nh\u1eefng thi\u1ebft b\u1ecb s\u1eed d\u1ee5ng \u0111i\u1ec7n n\u0103ng \u0111\u1ec3 bi\u1ebfn \u0111\u1ed5i th\u00e0nh quang n\u0103ng v\u00e0 m\u1ed9t ph\u1ea7n nhi\u1ec7t n\u0103ng. V\u00ed d\u1ee5 nh\u01b0 b\u00f3ng \u0111\u00e8n d\u00e2y t\u00f3c, b\u00f3ng \u0111\u00e8n hu\u1ef3nh quang,\u2026 B\u00f3ng \u0111\u1ec1 khi c\u00f3 \u0111i\u1ec7n n\u0103ng \u0111i qua s\u1ebd ph\u00e1t s\u00e1ng \u0111em \u0111\u1ebfn quang n\u0103ng. Tuy nhi\u00ean s\u1eed d\u1ee5ng trong th\u1eddi gian l\u00e2u d\u00e0i, b\u00f3ng \u0111\u00e8n s\u1ebd n\u00f3ng l\u00ean. Ta c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng th\u1ea5y m\u1ed9t ph\u1ea7n \u0111i\u1ec7n n\u0103ng trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y \u0111\u00e3 chuy\u1ec3n th\u00e0nh nhi\u1ec7t n\u0103ng.<\/p>\n\n\n\n
Ngo\u00e0i ra, c\u00f2n c\u00f3 nh\u1eefng thi\u1ebft b\u1ecb s\u1eed d\u1ee5ng \u0111i\u1ec7n n\u0103ng \u0111\u1ec3 bi\u1ebfn \u0111\u1ed5i th\u00e0nh c\u01a1 n\u0103ng v\u00e0 m\u1ed9t ph\u1ea7n nhi\u1ec7t n\u0103ng. V\u00ed d\u1ee5 nh\u01b0 m\u00e1y b\u01a1m, m\u00e1y khoan \u0111i\u1ec7n,\u2026 Nh\u1eefng chi\u1ebfc m\u00e1y n\u00e0y d\u00f9ng nhi\u1ec7t n\u0103ng \u0111\u1ec3 chuy\u1ec3n h\u00f3a th\u00e0nh c\u01a1 n\u0103ng. S\u1eed d\u1ee5ng nhi\u1ec1u trong c\u00e1c ho\u1ea1t \u0111\u1ed9ng th\u01b0\u1eddng ng\u00e0y. Tuy nhi\u00ean, m\u1ed9t ph\u1ea7n \u0111i\u1ec7n n\u0103ng \u0111\u00e3 bi\u1ebfn th\u00e0nh c\u01a1 n\u0103ng khi nh\u1eefng chi\u1ebfc m\u00e1y n\u00e0y n\u00f3ng l\u00ean.<\/p>\n\n\n\n
C\u0169ng s\u1ebd c\u00f3 tr\u01b0\u1eddng h\u1ee3p to\u00e0n b\u1ed9 \u0111i\u1ec7n n\u0103ng \u0111\u01b0\u1ee3c chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng. V\u00ed d\u1ee5 nh\u01b0 b\u1ebfp \u0111i\u1ec7n, n\u1ed3i c\u01a1m \u0111i\u1ec7n,\u2026 \u0110\u00e2y \u0111\u1ec1u l\u00e0 nh\u1eefng v\u1eadt d\u1ee5ng h\u00e0ng ng\u00e0y ch\u00fang ta s\u1eed d\u1ee5ng. \u0110i\u1ec7n n\u0103ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 chuy\u1ec3n h\u00f3a ho\u00e0n to\u00e0n th\u00e0nh nhi\u1ec7t n\u0103ng. Nhi\u1ec7t n\u0103ng n\u00e0y ph\u1ee5c v\u1ee5 cho cu\u1ed9c s\u1ed1ng th\u01b0\u1eddng ng\u00e0y c\u1ee7a ch\u00fang ta. \u0110\u1ecbnh lu\u1eadt Jun lenxo c\u00f3 \u00fd ngh\u0129a v\u1edbi nhi\u1ec7t l\u01b0\u1ee3ng \u0111\u1ebfn t\u1eeb nhi\u1ec7t n\u0103ng v\u00e0 \u0111i\u1ec7n n\u0103ng. M\u1ecdi v\u00ed d\u1ee5 ph\u00eda tr\u00ean ch\u00fang ta \u0111\u1ec1u c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ecbnh lu\u1eadt n\u00e0y \u0111\u1ec3 t\u00ednh to\u00e1n.<\/p>\n\n\n\n
\u0110\u1ecbnh lu\u1eadt Jun lenxo<\/p>\n\n\n\n
Nh\u1eefng nghi\u00ean c\u1ee9u v\u1ec1 v\u1eadt l\u00fd h\u1ecdc \u0111\u00e3 \u0111em \u0111\u1ebfn k\u1ebft qu\u1ea3 t\u1ed1t trong cu\u1ed9c s\u1ed1ng c\u1ee7a con ng\u01b0\u1eddi. \u0110\u1ecbnh lu\u1eadt Jun lenxo c\u0169ng l\u00e0 m\u1ed9t trong nh\u1eefng ph\u00e1t hi\u1ec7n v\u0129 \u0111\u1ea1i c\u1ee7a v\u1eadt l\u00fd h\u1ecdc. \u0110\u1ecbnh lu\u1eadt \u0111\u01b0\u1ee3c ph\u00e1t bi\u1ec3u nh\u01b0 sau:<\/p>\n\n\n\n
Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra \u1edf d\u00e2y d\u1eabn khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi b\u00ecnh ph\u01b0\u01a1ng c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n, v\u1edbi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn v\u00e0 th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua.<\/p>\n\n\n\n
\u0110\u1ecbnh lu\u1eadt Jun Lenxo \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng nhi\u1ec1u trong th\u1ef1c t\u1ebf<\/p>\n\n\n\n
H\u1ec7 th\u1ee9c c\u1ee7a \u0111\u1ecbnh lu\u1eadt: Q = I^2.R.t<\/p>\n\n\n\n
Trong \u0111\u00f3:<\/p>\n\n\n\n
R l\u00e0 \u0111i\u1ec7n tr\u1edf c\u1ee7a v\u1eadt d\u1eabn. \u0110\u01a1n v\u1ecb c\u1ee7a R l\u00e0 Ohm. K\u00fd hi\u1ec7u l\u00e0 \u03a9.<\/p>\n\n\n\n
I l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua v\u1eadt d\u1eabn. \u0110\u01a1n v\u1ecb c\u1ee7a c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n l\u00e0 Ampe. K\u00fd hi\u1ec7u l\u00e0 A.<\/p>\n\n\n\n
t l\u00e0 th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua v\u1eadt d\u1eabn. \u0110\u01a1n v\u1ecb c\u1ee7a th\u1eddi gian trong c\u00f4ng th\u1ee9c n\u00e0y l\u00e0 gi\u00e2y. K\u00fd hi\u1ec7u l\u00e0 s.<\/p>\n\n\n\n
Q l\u00e0 nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra t\u1eeb v\u1eadt d\u1eabn. \u0110\u01a1n v\u1ecb c\u1ee7a Q l\u00e0 Jun. K\u00fd hi\u1ec7u l\u00e0 J.<\/p>\n\n\n\n
Ngo\u00e0i nh\u1eefng \u0111\u01a1n v\u1ecb tr\u00ean th\u00ec c\u00e1c em c\u1ea7n ch\u00fa \u00fd \u0111\u1ebfn m\u1ed1i quan h\u1ec7 gi\u1eefa \u0111\u01a1n v\u1ecb Jun (J) v\u00e0 \u0111\u01a1n v\u1ecb calo (cal). Ch\u00fang c\u00f3 th\u1ec3 quy \u0111\u1ed5i cho nhau theo t\u1ec9 l\u1ec7 sau:<\/p>\n\n\n\n
1 J = 0,24 cal 1 cal = 4,18 J<\/code><\/pre>\n\n\n\nTuy nhi\u00ean trong c\u00e1c b\u00e0i t\u1eadp v\u1ec1 ch\u1ee7 \u0111\u1ec1 \u0111\u1ecbnh lu\u1eadt Jun lenx\u01a1 v\u1eadt l\u00fd 9 c\u00e1c em ch\u1ec9 c\u1ea7n nh\u1edb \u0111\u1ebfn \u0111\u01a1n v\u1ecb J. \u0110\u00e2y s\u1ebd l\u00e0 \u0111\u01a1n v\u1ecb \u0111\u01b0\u1ee3c d\u00f9ng nhi\u1ec1u nh\u1ea5t trong ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc c\u1ee7a c\u00e1c em. Ch\u00fang t\u00f4i v\u1eabn cung c\u1ea5p ki\u1ebfn th\u1ee9c v\u1ec1 \u0111\u01a1n v\u1ecb cal. C\u00e1c em ch\u1ec9 c\u1ea7n bi\u1ebft \u0111\u1ebfn \u0111i\u1ec1u n\u00e0y, m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i s\u1eed d\u1ee5ng nhi\u1ec1u. N\u1ebfu \u0111o nhi\u1ec7t l\u01b0\u1ee3ng Q b\u1eb1ng \u0111\u01a1n v\u1ecb calo th\u00ec h\u1ec7 th\u1ee9c c\u1ee7a \u0111\u1ecbnh lu\u1eadt Jun Len x\u01a1 l\u00e0: Q = 0,24.I^2.R.t<\/p>\n\n\n\n
V\u00ed d\u1ee5 b\u00e0i t\u1eadp v\u1ec1 \u0111\u1ecbnh lu\u1eadt Jun lenxo<\/p>\n\n\n\n
Ch\u00fang t\u00f4i \u0111\u00e3 s\u01b0u t\u1ea7m m\u1ed9t s\u1ed1 \u0111\u1ec1 b\u00e0i v\u1ec1 ch\u1ee7 \u0111\u1ec1 \u0111\u1ecbnh lu\u1eadt Jun len x\u01a1 \u0111\u1ec3 c\u00e1c em tham kh\u1ea3o. Nh\u1eefng \u0111\u1ec1 b\u00e0i n\u00e0y c\u00f3 th\u1ec3 l\u00e0 g\u1ee3i \u00fd cho c\u00e1c em trong c\u00e1ch l\u00e0m c\u0169ng nh\u01b0 ki\u1ebfn th\u1ee9c. C\u00e1c em h\u00e3y tham kh\u1ea3o ngay d\u01b0\u1edbi \u0111\u00e2y nh\u00e9:<\/p>\n\n\n\n
\u0110\u1ec1 b\u00e0i 1 \u0111\u1ecbnh lu\u1eadt Jun Lenxo<\/p>\n\n\n\n
M\u1ed9t b\u1ebfp \u0111i\u1ec7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf 220V th\u00ec d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua b\u1ebfp \u0111i\u1ec7n c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 3A. D\u00f9ng b\u1ebfp n\u00e0y \u0111un s\u00f4i \u0111\u01b0\u1ee3c 2 l\u00edt n\u01b0\u1edbc t\u1eeb nhi\u1ec7t \u0111\u1ed9 ban \u0111\u1ea7u 200 trong th\u1eddi gian 20 ph\u00fat. T\u00ednh hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ebfp \u0111i\u1ec7n, bi\u1ebft nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 c = 4200J\/kg.K<\/p>\n\n\n\n
84,8 %<\/p>\n\n\n\n
40%<\/p>\n\n\n\n
42,5%<\/p>\n\n\n\n
21,25%<\/p>\n\n\n\n
H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/p>\n\n\n\n
Nhi\u1ec7t l\u01b0\u1ee3ng m\u00e0 b\u1ebfp t\u1ecfa ra trong 20 ph\u00fat l\u00e0:<\/p>\n\n\n\n
Qtp = U.I.t = 220.3.20.60 = 792000 J<\/p>\n\n\n\n
Nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n cung c\u1ea5p \u0111\u1ec3 \u0111un s\u00f4i l\u01b0\u1ee3ng n\u01b0\u1edbc n\u00e0y l\u00e0:<\/p>\n\n\n\n
Q1 = c.m(t2 \u2013 t1) = 4200.2.80 = 672000 J<\/p>\n\n\n\n
Hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ebfp l\u00e0: \u2192 \u0110\u00e1p \u00e1n A<\/p>\n\n\n\n
M\u1ed9t \u1ee9ng d\u1ee5ng c\u1ee7a t\u1ea5m pin \u0111i\u1ec7n n\u0103ng<\/p>\n\n\n\n
\u0110\u1ec1 b\u00e0i 2 \u0111\u1ecbnh lu\u1eadt Jun Lenxo<\/p>\n\n\n\n
C\u00e2u ph\u00e1t bi\u1ec3u n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 kh\u00f4ng \u0111\u00fang?<\/p>\n\n\n\n
Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra \u1edf d\u00e2y d\u1eabn khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua:<\/p>\n\n\n\n
t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n, v\u1edbi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn v\u1edbi th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua.<\/p>\n\n\n\n
t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi b\u00ecnh ph\u01b0\u01a1ng c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n, v\u1edbi \u0111i\u1ec7n tr\u1edf c\u1ee7a d\u00e2y d\u1eabn v\u00e0 v\u1edbi th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua.<\/p>\n\n\n\n
t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi b\u00ecnh ph\u01b0\u01a1ng hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y d\u1eabn, v\u1edbi th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua v\u00e0 t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111i\u1ec7n tr\u1edf d\u00e2y d\u1eabn.<\/p>\n\n\n\n
t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi hi\u1ec7u \u0111i\u1ec7n th\u1ebf gi\u1eefa hai \u0111\u1ea7u d\u00e2y d\u1eabn, v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n v\u00e0 v\u1edbi th\u1eddi gian d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua.<\/p>\n\n\n\n
\u0110\u00e1p \u00e1n: A. D\u1ef1a v\u00e0o l\u00fd thuy\u1ebft v\u1ec1 \u0111\u1ecbnh lu\u1eadt Jun lenxo c\u00e1c em c\u00f3 th\u1ec3 ch\u1ecdn \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c.<\/p>\n\n\n\n
Tham kh\u1ea3o th\u00eam b\u00e0i h\u1ecdc t\u00e1c d\u1ee5ng t\u1eeb c\u1ee7a d\u00f2ng \u0111i\u1ec7n<\/p>\n\n\n\n
Tr\u00ean \u0111\u00e2y l\u00e0 nh\u1eefng ki\u1ebfn th\u1ee9c xoay quanh ch\u1ee7 \u0111\u1ec1 \u0111\u1ecbnh lu\u1eadt Jun lenx\u01a1. Hy v\u1ecdng nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e0y c\u00f3 th\u1ec3 gi\u00fap \u00edch cho c\u00e1c em trong vi\u1ec7c h\u1ecdc t\u1eadp<\/a> v\u00e0 l\u00e0m b\u00e0i. C\u1ea3m \u01a1n c\u00e1c em \u0111\u00e3 \u0111\u00f3n \u0111\u1ecdc b\u00e0i vi\u1ebft ng\u00e0y h\u00f4m nay. C\u00f3 r\u1ea5t nhi\u1ec1u b\u00e0i vi\u1ebft m\u1edbi tr\u00ean trang ch\u1ee7 c\u1ee7a<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Ch\u00fang ta \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00ecm hi\u1ec3u v\u1ec1 \u0111i\u1ec7n n\u0103ng trong c\u00e1c b\u00e0i h\u1ecdc v\u1eadt l\u00fd. Tuy nhi\u00ean \u0111i\u1ec7n n\u0103ng kh\u00f4ng h\u1ec1 t\u1ed3n t\u1ea1i duy nh\u1ea5t. Khi \u0111i\u1ec7n n\u0103ng sinh ra, \u0111i\u1ec7n n\u0103ng c\u00f2n c\u00f3 th\u1ec3 bi\u1ebfn \u0111\u1ed5i sang c\u00e1c d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng kh\u00e1c. \u0110i\u1ec1u n\u00e0y c\u00f3 \u00fd ngh\u0129a nh\u01b0 […]<\/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-1213","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\/1213","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=1213"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1213\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1213"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1213"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}