Yuav tsum paub paub yuav suav li cas, ua ntu zus thiab sib koom ua ke thiab ua haujlwm tsis sib xws? Yog tias koj tsis xav hlawv koj lub rooj tsav xwm hluav taws xob, koj yuav tsum paub! Kab lus no yuav qhia koj li cas hauv ob peb kauj ruam yooj yim. Ua ntej nyeem nws, nkag siab tias kev tawm tsam tsis tshua muaj cov tswv yim thiab cov zis. Kev siv cov lus tawm tswv yim thiab tso tawm tsuas yog tus lej ntawm kev hais lus los pab cov pib nkag siab lub tswv yim ntawm kev siv hluav taws xob.
Kauj ruam
Txoj Kev 1 ntawm 3: Series Kuj
Kauj Ruam 1. Nws yog dab tsi?
Series tsis kam yog qhov yooj yim txuas cov txiaj ntsig ntawm ib tus resistor rau cov tswv yim ntawm lwm tus tiv thaiv hauv Circuit Court. Txhua qhov kev tiv thaiv ntxiv hauv Circuit Court tau ntxiv rau qhov kev tiv thaiv ntawm Circuit Court.
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Cov mis rau xam tag nrho cov kev tawm tsam n resistors hauv kab hluav taws xob yog:
Rtag nrho = R ib1 + R2 +…. R
Yog li, tag nrho cov series resistors tsuas yog ntxiv. Piv txwv li, nrhiav kev tiv thaiv tag nrho ntawm daim duab hauv qab no
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Hauv qhov piv txwv no, R1 = 100 thiab R2 = 300Ω hauv koob. Rtag nrho = 100 + 300 = 400
Txoj Kev 2 ntawm 3: Parallel Parallel
Kauj Ruam 1. Nws yog dab tsi?
Kev ua haujlwm tsis sib luag yog thaum cov tswv yim ntawm ob lossis ntau tus tiv thaiv txuas nrog, thiab cov txiaj ntsig ntawm cov resistors txuas nrog.
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Cov mis rau hlua n resistors nyob rau hauv parallel yog:
Rtag nrho = 1/{(1/R1)+(1/R2)+(1/R3)..+(1/R.)}
- Nov yog qhov piv txwv. Paub R1 = 20, np2 = 30, thiab R.3 = 30.
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Tag nrho cov tsis kam rau 3 resistors nyob rau hauv parallel yog:
Rua eq = 1/{(1/20)+(1/30)+(1/30)}
= 1/{(3/60)+(2/60)+(2/60)}
= 1/(7/60) = 60/7 = kwv yees li 8.57.
Txoj Kev 3 ntawm 3: Series thiab Parallel Combination Circuits
Kauj Ruam 1. Nws yog dab tsi
Ib qho kev sib txuas ua ke yog kev sib txuas ntawm txhua kab thiab cov kab hluav taws xob sib txuas uas txuas nrog hauv ib qho kev sib txuas. Sim nrhiav qhov kev tiv thaiv tag nrho ntawm cov kab hauv qab no.
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Peb saib cov resistor R1 thiab R.2 txuas nrog hauv koob. Yog li, tag nrho kev tiv thaiv (peb hu nws Rs) yog:
Rs = R ib1 + R2 = 100 + 300 = 400.
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Tom ntej no, peb saib tus resistor R3 thiab R.4 txuas nyob rau hauv parallel. Yog li, tag nrho kev tiv thaiv (peb hu nws Rp1 yws) yog:
Rp1 yws = 1/{(1/20)+(1/20)} = 1/(2/20) = 20/2 = 10
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Tom qab ntawd, peb pom tias tus tiv thaiv R5 thiab R.6 kuj txuas nrog ua ke. Yog li, tag nrho kev tiv thaiv (peb hu nws Rp2 xav) yog:
Rp2 xav = 1/{(1/40)+(1/10)} = 1/(5/40) = 40/5 = 8
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Yog li tam sim no peb muaj Circuit nrog resistor Rs, Rp1 yws, Rp2 xav thiab R.7 txuas nrog hauv koob. Cov kev tawm tsam no tuaj yeem raug ntxiv kom tau txais tag nrho kev tiv thaiv Rtag nrho los ntawm thawj ntu uas tau muab rau peb.
Rtag nrho = 400 + 20 + 8 = 428.
Qee Qhov Tseeb
- Nkag siab txog cov teeb meem. Ib yam khoom twg uas tuaj yeem tsim hluav taws xob tam sim no muaj qhov tiv taus, uas yog qhov tsis kam ntawm cov khoom siv rau hluav taws xob tam sim no.
- Kev tiv thaiv yog ntsuas hauv chav ohm ua. Lub cim siv rau ohms yog.
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Cov ntaub ntawv sib txawv muaj cov yam ntxwv tiv taus sib txawv.
- Piv txwv li, tooj liab, muaj qhov tiv taus ntawm 0.0000017 (Ω/cm3)
- Ceramic muaj qhov tiv taus txog li 1014(Ω/cm ib3)
- Qhov loj dua tus lej, qhov ntau dua qhov tsis kam ua hluav taws xob. Raws li koj tuaj yeem pom, tooj liab uas feem ntau siv hauv cov hluav taws xob hluav taws xob, muaj qhov tiv taus qis. Ceramics, ntawm qhov tod tes, yog cov tiv taus heev, ua rau lawv zoo insulators.
- Txoj hauv kev koj sib sau ua ke cov neeg tawm tsam yuav ua qhov sib txawv loj rau kev ua tiav tag nrho ntawm cov hluav taws xob hluav taws xob.
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V = IR Nov yog Ohm txoj cai, txhais los ntawm Georg Ohm thaum ntxov 1800s. Yog tias koj paub ob qhov sib txawv ntawm qhov kev ua zauv no, koj tuaj yeem yooj yim xam qhov sib txawv thib peb.
- V = IR: Voltage (V) yog cov khoom lag luam tam sim no (I) * tsis kam (R).
- I = V/R: Tam sim no yog khoom ntawm kev faib hluav taws xob (V) tsis kam (R).
- R = V/I: Kev tawm tsam yog cov khoom ntawm kev faib hluav taws xob (V) tam sim no (I).
Lub tswv yim
- Nco ntsoov tias thaum cov resistors tau teeb tsa ua ke, muaj ntau txoj hauv kev coj mus rau qhov kawg ntawm Circuit Court, yog li tag nrho kev tiv thaiv yuav tsawg dua txhua txoj hauv kev. Thaum cov resistors txuas nrog hauv kab, tam sim no ntws los ntawm txhua tus tiv thaiv, yog li txhua tus tiv thaiv tau ntxiv mus kom pom tag nrho cov tsis kam hauv koob.
- Kev tiv thaiv tag nrho (Rtot) ib txwm tsawg dua qhov kev tiv thaiv tsawg tshaj plaws ntawm kev sib tw Circuit Court; tag nrho kev tiv thaiv ib txwm muaj ntau dua li qhov ua tau zoo tshaj plaws ntawm kev ua haujlwm hauv Circuit Court.
