Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n
Ch\u00fang ta \u0111\u00e3 t\u1eebng t\u00ecm hi\u1ec3u v\u1ec1 c\u00f4ng c\u01a1 h\u1ecdc, c\u00f4ng c\u1ee7a l\u1ef1c t\u1ea1o ra. V\u1eady d\u00f2ng \u0111i\u1ec7n c\u00f3 \u0111em \u0111\u1ebfn lo\u1ea1i c\u00f4ng n\u00e0o hay kh\u00f4ng? \u0110\u00e2y l\u00e0 m\u1ed9t c\u00e2u h\u1ecfi \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u em h\u1ecdc sinh<\/a> l\u1edbp 9 \u0111\u1eb7t ra? Ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 9 ch\u1ee7 \u0111\u1ec1 c\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n s\u1ebd gi\u1ea3i \u0111\u00e1p cho ch\u00fang ta \u0111i\u1ec1u n\u00e0y. \u0110\u1ec3 hi\u1ec3u h\u01a1n v\u1ec1 c\u00f4ng su\u1ea5t, c\u00f4ng m\u00e0 d\u00f2ng \u0111i\u1ec7n sinh ra. Ch\u00fang ta h\u00e3y c\u00f9ng nhau t\u00ecm hi\u1ec3u v\u00e0 gi\u1ea3i \u0111\u00e1p trong b\u00e0i vi\u1ebft ng\u00e0y h\u00f4m nay nh\u00e9! Ch\u1eafc ch\u1eafn ki\u1ebfn th\u1ee9c n\u00e0y s\u1ebd \u0111em \u0111\u1ebfn cho c\u00e1c em s\u1ef1 kh\u00e1m ph\u00e1 v\u1ec1 nhi\u1ec1u \u0111i\u1ec1u m\u1edbi m\u1ebb trong cu\u1ed9c s\u1ed1ng.<\/p>\n\n\n\n D\u00f2ng \u0111i\u1ec7n l\u00e0 g\u00ec?<\/p>\n\n\n\n Tr\u01b0\u1edbc khi \u0111\u1ebfn v\u1edbi ngu\u1ed3n \u0111i\u1ec7n hay c\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n ch\u00fang ta c\u1ea7n ph\u1ea3i hi\u1ec3u v\u1ec1 d\u00f2ng \u0111i\u1ec7n. \u0110\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c ngu\u1ed3n \u0111i\u1ec7n, d\u00f2ng \u0111i\u1ec7n ch\u00ednh l\u00e0 y\u1ebfu t\u1ed1 ti\u00ean quy\u1ebft \u0111\u1ec3 sinh ra \u0111i\u1ec1u n\u00e0y. D\u00f2ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u00e0 d\u00f2ng \u0111i\u1ec7n t\u00edch d\u1ecbch chuy\u1ec3n c\u00f3 h\u01b0\u1edbng. \u0110i\u1ec7n t\u00edch n\u00e0y s\u1ebd \u0111i t\u1eeb c\u1ef1c \u00e2m sang c\u1ef1c d\u01b0\u01a1ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n. \u0110\u00e2y ch\u00ednh l\u00e0 nh\u1eefng l\u00fd thuy\u1ebft ban \u0111\u1ea7u ch\u00fang ta c\u1ea7n bi\u1ebft v\u1ec1 ch\u1ee7 \u0111\u1ec1 n\u00e0y. Ch\u00fang ta c\u00f3 th\u1ec3 b\u1eaft g\u1eb7p r\u1ea5t nhi\u1ec1u thi\u1ebft b\u1ecb \u0111i\u1ec7n trong cu\u1ed9c s\u1ed1ng.<\/p>\n\n\n\n \u0110\u1ec3 nh\u1eefng thi\u1ebft b\u1ecb n\u00e0y c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng, th\u00ec c\u1ea7n ph\u1ea3i c\u00f3 d\u00f2ng \u0111i\u1ec7n. D\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua khi\u1ebfn cho c\u00e1c thi\u1ebft b\u1ecb n\u00e0y c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng. V\u00ed d\u1ee5 nh\u01b0 qu\u1ea1t \u0111i\u1ec7n, b\u00f3ng \u0111\u00e8n, hay tivi. Ch\u00fang ta ph\u1ea3i k\u1ebft n\u1ed1i nh\u1eefng thi\u1ebft b\u1ecb n\u00e0y v\u1edbi ngu\u1ed3n \u0111i\u1ec7n, \u0111\u1ec3 d\u00f2ng \u0111i\u1ec7n \u0111i qua. Th\u00ec nh\u1eefng thi\u1ebft b\u1ecb n\u00e0y m\u1edbi c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang m\u1ee5c \u0111\u00edch c\u1ee7a ch\u00fang. C\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n \u1ea3nh h\u01b0\u1edfng r\u1ea5t nhi\u1ec1u \u0111\u1ebfn d\u00f2ng \u0111i\u1ec7n v\u00e0 c\u00e1c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n. \u0110\u00f3 ch\u00ednh l\u00e0 l\u00fd do ch\u00fang ta ph\u1ea3i t\u00ecm hi\u1ec3u chung nh\u1eefng \u0111i\u1ec1u n\u00e0y v\u1edbi nhau.<\/p>\n\n\n\n M\u1ed9t v\u00e0i d\u1ea1ng \u1ee9ng d\u1ee5ng ngu\u1ed3n \u0111i\u1ec7n<\/p>\n\n\n\n Ngu\u1ed3n \u0111i\u1ec7n l\u00e0 g\u00ec?<\/p>\n\n\n\n N\u1ebfu nh\u01b0 d\u00f2ng \u0111i\u1ec7n l\u00e0 d\u00f2ng c\u00e1c \u0111i\u1ec7n t\u00edch d\u1ecbch chuy\u1ec3n c\u00f3 h\u01b0\u1edbng. Th\u00ec ngu\u1ed3n \u0111i\u1ec7n ch\u00ednh l\u00e0 n\u01a1i cung c\u1ea5p d\u00f2ng \u0111i\u1ec7n cho c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n. Ngu\u1ed3n \u0111i\u1ec7n \u0111\u00f3ng vai tr\u00f2 cung c\u1ea5p c\u00e1c d\u00f2ng \u0111i\u1ec7n t\u00edch \u0111i qua thi\u1ebft b\u1ecb \u0111i\u1ec7n. V\u00ed d\u1ee5 v\u1ec1 ngu\u1ed3n \u0111i\u1ec7n trong cu\u1ed9c s\u1ed1ng th\u01b0\u1eddng ng\u00e0y c\u1ee7a ch\u00fang ta ch\u00ednh l\u00e0 \u1eafc quy, pin,\u2026 B\u1ea5t c\u1ee9 nh\u1eefng v\u1eadt cung c\u1ea5p \u0111i\u1ec7n cho thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111\u1ec1u c\u00f3 th\u1ec3 coi l\u00e0 ngu\u1ed3n \u0111i\u1ec7n.<\/p>\n\n\n\n M\u1ed7i ngu\u1ed3n \u0111i\u1ec7n \u0111\u1ec1u c\u00f3 hai c\u1ef1c \u00e2m v\u00e0 d\u01b0\u01a1ng. Nh\u01b0 ch\u00fang ta \u0111\u00e3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn ph\u00eda tr\u00ean. D\u00f2ng c\u00e1c \u0111i\u1ec7n t\u00edch d\u1ecbch chuy\u1ec3n c\u00f3 h\u01b0\u1edbng t\u1ea1o l\u00ean d\u00f2ng \u0111i\u1ec7n. Nh\u01b0ng nh\u1eefng \u0111i\u1ec7n t\u00edch n\u00e0y s\u1ebd \u0111i t\u1eeb c\u1ef1c \u00e2m qua d\u00e2y d\u1eabn quy v\u1ec1 c\u1ef1c d\u01b0\u01a1ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n. \u0110\u00e2y ch\u00ednh l\u00e0 nh\u1eefng l\u00fd thuy\u1ebft m\u00e0 c\u00e1c em c\u1ea7n ph\u1ea3i bi\u1ebft tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 c\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n. M\u1ea1ch \u0111i\u1ec7n c\u00f3 ngu\u1ed3n \u0111i\u1ec7n \u0111\u1ec3 cung c\u1ea5p \u0111i\u1ec7n t\u00edch cho c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n.<\/p>\n\n\n\n Trong m\u1ed9t m\u1ea1ch \u0111i\u1ec7n c\u01a1 b\u1ea3n s\u1ebd bao g\u1ed3m ngu\u1ed3n \u0111i\u1ec7n v\u00e0 c\u00e1c ph\u1ea7n t\u1eed \u0111i\u1ec7n. Khi m\u1ea1ch \u0111i\u1ec7n k\u00edn, d\u00f2ng \u0111i\u1ec7n t\u00edch s\u1ebd d\u1ecbch chuy\u1ec3n \u0111i qua c\u00e1c ph\u1ea7n t\u1eed \u0111i\u1ec7n. Ch\u00fang ta c\u00f3 th\u1ec3 v\u00ed d\u1ee5 v\u1ec1 m\u1ea1ch \u0111i\u1ec7n \u0111\u01a1n gi\u1ea3n bao g\u1ed3m ngu\u1ed3n, kh\u00f3a K, \u0111\u00e8n, d\u00e2y d\u1eabn. Khi t\u1ea5t c\u1ea3 \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi nhau s\u1ebd t\u1ea1o th\u00e0nh m\u1ea1ch \u0111i\u1ec7n. Kh\u00f3a K \u0111\u00f3ng, b\u00f3ng \u0111\u00e8n s\u1ebd s\u00e1ng v\u00ec \u0111\u00e2y l\u00e0 m\u1ea1ch \u0111i\u1ec7n k\u00edn. Ng\u01b0\u1ee3c l\u1ea1i khi kh\u00f3a K m\u1edf, m\u1ea1ch \u0111i\u1ec7n h\u1edf, b\u00f3ng \u0111\u00e8n s\u1ebd kh\u00f4ng c\u00f3 d\u00f2ng \u0111i\u1ec7n \u0111i qua.<\/p>\n\n\n\n \u0110i\u1ec7n n\u0103ng ti\u00eau th\u1ee5 c\u1ee7a \u0111o\u1ea1n m\u1ea1ch<\/p>\n\n\n\n \u0110i\u1ec7n n\u0103ng ti\u00eau th\u1ee5 c\u1ee7a \u0111o\u1ea1n m\u1ea1ch ch\u00ednh l\u00e0 ngu\u1ed3n g\u1ed1c sinh ra c\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n. L\u01b0\u1ee3ng \u0111i\u1ec7n n\u0103ng m\u00e0 \u0111o\u1ea1n m\u1ea1ch ti\u00eau th\u1ee5 khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua chuy\u1ec3n h\u00f3a th\u00e0nh c\u00e1c d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng kh\u00e1c. L\u01b0\u1ee3ng \u0111i\u1ec7n n\u0103ng n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng c\u00f4ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n th\u1ef1c hi\u1ec7n d\u1ecbch chuy\u1ec3n c\u00f3 h\u01b0\u1edbng c\u1ee7a c\u00e1c \u0111i\u1ec7n t\u00edch. Ch\u00fang ta c\u00f3 th\u1ec3 t\u00ednh c\u00f4ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n d\u1ef1a tr\u00ean l\u00fd thuy\u1ebft n\u00e0y. C\u00e1c em c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00f4ng th\u1ee9c sau \u0111\u00e2y:<\/p>\n\n\n\n A = U.q = U.I.t<\/p>\n\n\n\n Trong \u0111\u00f3:<\/p>\n\n\n\n A ch\u00ednh l\u00e0 c\u00f4ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n. \u0110\u01a1n v\u1ecb l\u00e0 Jun, k\u00fd hi\u1ec7u J.<\/p>\n\n\n\n U l\u00e0 hi\u1ec7u \u0111i\u1ec7n th\u1ebf c\u1ee7a \u0111o\u1ea1n m\u1ea1ch. \u0110\u01a1n v\u1ecb l\u00e0 V\u00f4n, k\u00fd hi\u1ec7u V.<\/p>\n\n\n\n I l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a d\u00f2ng \u0111i\u1ec7n. \u0110\u01a1n v\u1ecb l\u00e0 Ampe, k\u00fd hi\u1ec7u A.<\/p>\n\n\n\n t l\u00e0 th\u1eddi gian. \u0110\u01a1n v\u1ecb l\u00e0 gi\u00e2y, k\u00fd hi\u1ec7u s.<\/p>\n\n\n\n D\u1ea1ng ngu\u1ed3n \u0111i\u1ec7n m\u1ed9t chi\u1ec1u c\u01a1 b\u1ea3n<\/p>\n\n\n\n C\u00f4ng th\u1ee9c n\u00e0y c\u00f3 th\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c l\u01b0\u1ee3ng \u0111i\u1ec7n n\u0103ng ti\u00eau th\u1ee5 c\u1ee7a \u0111o\u1ea1n m\u1ea1ch. C\u00e1c em n\u00ean ghi ch\u00e9p l\u1ea1i c\u00f4ng th\u1ee9c n\u00e0y \u0111\u1ec3 s\u1eed d\u1ee5ng trong b\u00e0i t\u1eadp tr\u00ean l\u1edbp. \u0110\u00f4i khi nh\u1eefng \u0111\u01a1n v\u1ecb c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f3 trong c\u00f4ng th\u1ee9c kh\u00f4ng ph\u1ea3i \u0111\u01a1n v\u1ecb chu\u1ea9n. C\u00e1c em n\u00ean quy \u0111\u1ed5i v\u1ec1 \u0111\u01a1n v\u1ecb nh\u01b0 quy \u01b0\u1edbc \u0111\u1ec3 c\u00f3 th\u1ec3 t\u00ednh to\u00e1n \u0111\u00fang h\u01a1n. T\u00ednh \u0111\u01b0\u1ee3c \u0111i\u1ec7n n\u0103ng ti\u00eau th\u1ee5 c\u00e1c em m\u1edbi c\u00f3 th\u1ec3 bi\u1ebft \u0111\u01b0\u1ee3c c\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n. \u0110\u00e2y ch\u00ednh l\u00e0 \u0111i\u1ec1u c\u00e1c em c\u1ea7n ph\u1ea3i ghi nh\u1edb v\u00e0 s\u1eed d\u1ee5ng nhi\u1ec1u.<\/p>\n\n\n\n C\u00f4ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n<\/p>\n\n\n\n C\u00f4ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u00e0 \u0111i\u1ec7n n\u0103ng ti\u00eau th\u1ee5 trong to\u00e0n m\u1ea1ch. Ch\u00fang ta c\u00f3 th\u1ec3 t\u00ednh c\u00f4ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n theo c\u00f4ng th\u1ee9c sau \u0111\u00e2y:<\/p>\n\n\n\n A = E.q = E.I.t<\/p>\n\n\n\n Trong \u0111\u00f3:<\/p>\n\n\n\n A ch\u00ednh l\u00e0 c\u00f4ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n. \u0110\u01a1n v\u1ecb l\u00e0 Jun, k\u00fd hi\u1ec7u J.<\/p>\n\n\n\n E l\u00e0 su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng c\u1ee7a ngu\u1ed3n. \u0110\u01a1n v\u1ecb l\u00e0 V\u00f4n, k\u00fd hi\u1ec7u V. Th\u00f4ng th\u01b0\u1eddng, trong c\u00e1c b\u00e0i t\u1eadp c\u1ee7a c\u00e1c em s\u1ebd \u0111\u01b0\u1ee3c cho \u0111\u1ed9 l\u1edbn c\u1ee7a E. C\u00e1c em ch\u1ec9 c\u1ea7n l\u1eafp v\u00e0o c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ednh to\u00e1n.<\/p>\n\n\n\n I ch\u00ednh l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n. \u0110\u01a1n v\u1ecb l\u00e0 Ampe, k\u00fd hi\u1ec7u l\u00e0 A.<\/p>\n\n\n\n t l\u00e0 th\u1eddi gian. \u0110\u01a1n v\u1ecb l\u00e0 gi\u00e2y, k\u00fd hi\u1ec7u s.<\/p>\n\n\n\n T\u1eeb c\u00f4ng th\u1ee9c n\u00e0y, c\u00e1c em t\u00ednh \u0111\u01b0\u1ee3c c\u00f4ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n. Sau \u0111\u00f3 c\u00e1c em m\u1edbi c\u00f3 th\u1ec3 t\u00ednh c\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n sinh ra. C\u00e1c em c\u1ea7n ph\u1ea3i t\u00ecm hi\u1ec3u t\u1eeb c\u00e1c b\u01b0\u1edbc tr\u01b0\u1edbc khi l\u00e0m b\u00e0i.<\/p>\n\n\n\n C\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n<\/p>\n\n\n\n C\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n l\u00e0 \u0111\u1eb7c tr\u01b0ng cho t\u1ed1c \u0111\u1ed9 th\u1ef1c hi\u1ec7n c\u00f4ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n \u0111\u00f3. C\u00f4ng su\u1ea5t n\u00e0y \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng c\u00f4ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n th\u1ef1c hi\u1ec7n trong m\u1ed9t \u0111\u01a1n v\u1ecb th\u1eddi gian. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fd do c\u00e1c em c\u1ea7n t\u00ecm hi\u1ec3u v\u1ec1 c\u00f4ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n tr\u01b0\u1edbc khi \u0111\u1ebfn v\u1edbi \u0111\u1ecbnh ngh\u0129a n\u00e0y. C\u00e1c em c\u00f3 th\u1ec3 t\u00ednh c\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n b\u1eb1ng c\u00f4ng th\u1ee9c sau \u0111\u00e2y:<\/p>\n\n\n\n P = A\/t = E.I<\/p>\n\n\n\n Trong \u0111\u00f3:<\/p>\n\n\n\n P ch\u00ednh l\u00e0 c\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n.<\/p>\n\n\n\n A l\u00e0 c\u00f4ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n. Ch\u00fang t\u00f4i \u0111\u00e3 gi\u1edbi thi\u1ec7u v\u1ec1 c\u00e1ch t\u00ednh c\u00f4ng \u1edf ph\u00eda tr\u00ean.<\/p>\n\n\n\n t l\u00e0 th\u1eddi gian th\u1ef1c hi\u1ec7n c\u00f4ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n.<\/p>\n\n\n\n E l\u00e0 su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng c\u1ee7a ngu\u1ed3n.<\/p>\n\n\n\n I l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a d\u00f2ng \u0111i\u1ec7n.<\/p>\n\n\n\n C\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n l\u00e0 g\u00ec?<\/p>\n\n\n\n V\u1edbi c\u00f4ng th\u1ee9c n\u00e0y, c\u00e1c em c\u00f3 th\u1ec3 d\u00f9ng 1 trong 2 bi\u1ec3u th\u1ee9c \u0111\u00e3 cho. \u0110\u00e2y \u0111\u1ec1u l\u00e0 c\u00f4ng th\u1ee9c \u0111\u00fang \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00f4ng su\u1ea5t c\u1ee7a m\u1ed9t ngu\u1ed3n \u0111i\u1ec7n. \u0110\u1ec1 b\u00e0i cho c\u00e1c em s\u1ed1 li\u1ec7u, \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0o, th\u00ec c\u00e1c em s\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c c\u00f3 ch\u1ee9a \u0111\u1ea1i l\u01b0\u1ee3ng \u0111\u00f3. \u0110\u00e2y c\u0169ng ch\u00ednh l\u00e0 m\u1eb9o l\u00e0m b\u00e0i t\u1eadp d\u00e0nh cho c\u00e1c em.<\/p>\n\n\n\n V\u00ed d\u1ee5 \u0111\u1ec1 b\u00e0i v\u1ec1 c\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n<\/p>\n\n\n\n Ch\u00fang t\u00f4i \u0111\u00e3 tham kh\u1ea3o m\u1ed9t s\u1ed1 \u0111\u1ec1 b\u00e0i v\u1ec1 ch\u1ee7 \u0111\u1ec1 n\u00e0y. C\u00e1c em c\u00f3 th\u1ec3 tham kh\u1ea3o \u0111\u1ec1 b\u00e0i v\u00e0 c\u00e1ch l\u00e0m ngay ph\u00eda d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n\n\n\n \u0110\u1ec1 b\u00e0i1: Acquy c\u00f3 r = 0,08\u03a9. Khi d\u00f2ng \u0111i\u1ec7n qua acquy l\u00e0 4A, n\u00f3 cung c\u1ea5p cho m\u1ea1ch ngo\u00e0i m\u1ed9t c\u00f4ng su\u1ea5t b\u1eb1ng 8W. H\u1ecfi khi d\u00f2ng \u0111i\u1ec7n qua acquy l\u00e0 6A, n\u00f3 cung c\u1ea5p cho m\u1ea1ch ngo\u00e0i c\u00f4ng su\u1ea5t bao nhi\u00eau?<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn:<\/p>\n\n\n\n Hi\u1ec7u \u0111i\u1ec7n th\u1ebf m\u1ea1ch ngo\u00e0i: U = E \u2013 rI.<\/p>\n\n\n\n C\u00f4ng su\u1ea5t cung c\u1ea5p cho m\u1ea1ch ngo\u00e0i: P = UI = (E \u2013 rI)I.<\/p>\n\n\n\n V\u1eady: Khi d\u00f2ng \u0111i\u1ec7n qua acquy l\u00e0 6A, n\u00f3 cung c\u1ea5p cho m\u1ea1ch ngo\u00e0i c\u00f4ng su\u1ea5t l\u00e0 P\u2019 = 11,04W.<\/p>\n\n\n\n M\u1ed9t trong nh\u1eefng d\u1ea1ng b\u00e0i t\u1eadp \u1ee9ng d\u1ee5ng<\/p>\n\n\n\n Ngo\u00e0i ra c\u00e1c em c\u0169ng c\u00f3 th\u1ec3 g\u1eb7p d\u1ea1ng b\u00e0i tr\u1eafc nghi\u1ec7m trong ch\u1ee7 \u0111\u1ec1 n\u00e0y. C\u00e1c em ch\u1ec9 c\u1ea7n nh\u1edb c\u00f4ng th\u1ee9c v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m \u0111\u1ec3 ch\u1ecdn \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c nh\u1ea5t. V\u1edbi d\u1ea1ng b\u00e0i tr\u1eafc nghi\u1ec7m, l\u00fd thuy\u1ebft s\u1ebd \u0111\u01b0\u1ee3c \u01b0u ti\u00ean h\u01a1n c\u1ea3. Nh\u1edb l\u00fd thuy\u1ebft c\u00e1c em \u0111\u00e3 c\u00f3 th\u1ec3 l\u00e0m b\u00e0i ch\u00ednh x\u00e1c.<\/p>\n\n\n\n Tham kh\u1ea3o th\u00eam v\u1ec1 b\u00e0i h\u1ecdc \u0110\u1ecbnh lu\u1eadt Jun Lenxo<\/p>\n\n\n\n C\u00f3 th\u1ec3 n\u00f3i, nh\u1eefng ki\u1ebfn th\u1ee9c v\u1ec1 c\u00f4ng su\u1ea5t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u00fang t\u00f4i \u0111\u1ec1 c\u1eadp tr\u00ean \u0111\u00e2y. Hy v\u1ecdng nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e0y c\u00f3 th\u1ec3 \u0111em l\u1ea1i cho c\u00e1c em \u0111i\u1ec1u h\u1eefu \u00edch. Ngay c\u1ea3 nh\u1eefng v\u00ed d\u1ee5 v\u00e0 \u0111\u1ec1 b\u00e0i ch\u00fang t\u00f4i cung c\u1ea5p. C\u00e1c em c\u0169ng c\u00f3 th\u1ec3 tham kh\u1ea3o v\u00e0 l\u00e0m theo. \u0110\u00e2y s\u1ebd l\u00e0 nh\u1eefng v\u00ed d\u1ee5 ch\u1ea5t l\u01b0\u1ee3ng \u0111\u1ec3 c\u00e1c em c\u00f3 th\u1ec3 h\u1ecdc t\u1eadp<\/a> t\u1ed1t<\/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 t\u1eebng t\u00ecm hi\u1ec3u v\u1ec1 c\u00f4ng c\u01a1 h\u1ecdc, c\u00f4ng c\u1ee7a l\u1ef1c t\u1ea1o ra. V\u1eady d\u00f2ng \u0111i\u1ec7n c\u00f3 \u0111em \u0111\u1ebfn lo\u1ea1i c\u00f4ng n\u00e0o hay kh\u00f4ng? \u0110\u00e2y l\u00e0 m\u1ed9t c\u00e2u h\u1ecfi \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u em h\u1ecdc sinh l\u1edbp 9 \u0111\u1eb7t ra? Ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 9 ch\u1ee7 \u0111\u1ec1 c\u00f4ng […]<\/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-1217","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\/1217","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=1217"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1217\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1217"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1217"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1217"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}+ V\u1edbi I = 4A \u21d2 P = (E \u2013 0,08.4).4 = 8 \u21d2 E = 2,32V.\n\n+ V\u1edbi I\u2019 = 6A \u21d2 P\u2019 = (2,32 \u2013 0,08.6).6 = 11,04W.<\/code><\/pre>\n\n\n\n