Lub tswv yim ntawm cov khoom siv hluav taws xob tas li tam sim no

Thaum daim phiaj hluav taws xob thiab lwm yam cuam tshuam hloov pauv nrog qee yam, nws tuaj yeem muab cov khoom siv hluav taws xob ruaj khov tam sim no.

Dab tsi yog qhov tam sim no? Cov khoom siv hluav taws xob tas li yog dab tsi?

Qhov tam sim no tseem tuaj yeem hu ua khov kho tam sim no, uas zoo ib yam hauv lub ntsiab lus thiab feem ntau tsis xav tau qhov txawv. Piv nrog lub tswv yim ntawm qhov hluav taws xob tas li, lub tswv yim ntawm qhov tam sim no tsis yooj yim to taub, vim qhov hluav taws xob tsis tu ncua muaj ntau nyob hauv lub neej txhua hnub. Cov roj teeb cia thiab roj teeb qhuav yog DC cov khoom siv hluav taws xob tsis tu ncua, thaum 220V AC tuaj yeem suav tias yog ib hom AC Cov khoom siv hluav taws xob tsis tu ncua, vim tias lawv qhov hluav taws xob tso tawm yog qhov tsis hloov pauv, tsis txawv ntau nrog kev hloov pauv ntawm cov zis tam sim no.

Ua ntej, muab piv txwv: tus nqi tam sim no hloov pauv mus rau 1A thiab qhov tso zis ntau tshaj qhov siab txog 100V. Thaum koj qhib lub zog hloov pauv ntawm qhov tam sim no tam sim no, koj yuav pom qhov muaj txiaj ntsig zoo li cas ntawm lub zog hluav taws xob voltmeter thiab lub ntsuas tam sim no. Dab tsi? Nws tuaj yeem pom nrog qhov tseeb tias qhov hluav taws xob tso tawm yog 100V thiab cov zis tam sim no yog 0A. Ib tus neeg ib zaug nug, koj puas yog 100V 1A qhov chaw tam sim no? Vim li cas cov zis tsis yog 100V 1A? Ntawm no peb tseem yuav tsum siv Ohm txoj cai los piav qhia. Hauv kev xav, nws tuaj yeem suav tau zoo li no: qhov hluav taws xob tso tawm ntawm lub zog hluav taws xob U = IR, qhov twg U yog qhov hluav taws xob tso tawm, Kuv yog qhov tso tawm tam sim no, thiab R yog qhov thauj khoom tsis kam.

Cov hauv qab no tau muab faib ua 5 qhov xwm txheej los piav qhia:

Yog tias lub hwj chim tsis muaj thauj khoom, R tuaj yeem sawv cev los ntawm qhov tsis muaj qhov kawg, U = I* ∞, vim tias lub zog xa hluav taws xob tuaj yeem tso tawm 1A tam sim no, yog tias lub zog xa khoom tam sim no yog 1A, ces U = 1A* ∞ = ∞, thiab Lub zog hluav taws xob tuaj yeem tsuas yog tso tawm 100V feem ntau Tsis ntseeg, lub zog siv hluav taws xob tuaj yeem tso tawm nws qhov siab tshaj plaws ntawm 100V. Txij li lub zog hluav taws xob tsis tuaj yeem tso tawm qhov hluav taws xob tsis muaj qhov kawg, qhov tam sim no tsuas yog tus nqi me me xwb, uas yog, cov zis tam sim no yog 0A, uas yog, I = U/ R = 100V/ ∞ = 0A.

Yog tias lub zog tiv taus R = 200 ohms, vim tias lub zog hluav taws xob tuaj yeem tso tawm 100V, tam sim no tsuas yog 0.5A, uas yog, I = U/R = 100V/200R = 0.5A

Yog tias lub zog tiv taus R = 100 ohms, vim tias lub zog hluav taws xob tuaj yeem tsim tawm 100V, qhov tam sim no tuaj yeem mus txog 1A, uas yog, I = U/R = 100V/100R = 1A, thiab cov zis tam sim no tsuas yog mus txog qhov tam sim no tus nqi tam sim no fais fab mov.

Yog tias qhov hnyav tsis kam txuas ntxiv mus, hloov nws mus rau 50 ohms. Raws li tus qauv I = U/R = 100V/50R = 2A Tab sis qhov tseem ceeb ntawm no yog tias peb lub zog siv hluav taws xob yog lub zog muab nrog tus nqi tam sim no ntawm 1A, yog li cov zis tam sim no nyob rau lub sijhawm no Nws tsuas tuaj yeem raug yuam kom txwv rau 1A tsis yog 2A, yog li cov zis hluav taws xob tsuas tuaj yeem raug yuam kom poob rau 50V hloov ntawm 100V. Ntawm no peb tseem yuav tsum ua raws Ohm txoj cai, uas yog, U = IR = 1A*50R = 50V

Yog tias qhov kev tiv thaiv tsis dhau los ua 0 ohm (uas yog luv Circuit Court), tom qab ntawd cov zis tam sim no tsuas yog 1A, qhov hluav taws xob tso tawm tsuas yog 0V, uas yog, U = I*R = 1A*0R = 0V

Los ntawm 5 qhov piv txwv saum toj no, nws tuaj yeem pom tias yog lub thauj khoom tsis kam loj dhau, cov zis tam sim no ntawm lub zog siv hluav taws xob tsis tuaj yeem ncav tus nqi tam sim no, tom qab ntawd qhov hluav taws xob tso tawm ntawm qhov tam sim no qhov chaw yuav cia li nce mus rau qhov siab tshaj tawm qhov hluav taws xob. ntawm lub zog xa khoom, tsuas yog thaum lub zog tiv taus me me rau qee qhov txiaj ntsig Lub zog tam sim no tso tawm ntawm lub zog xa mus txog tus nqi tam sim no, thiab lub zog siv tau tiag tiag hauv lub xeev tam sim no ua haujlwm tas li. Nrog maj mam txo qis ntawm tus nqi tsis kam ua haujlwm, qhov hluav taws xob tso tawm kuj tseem poob qis kom tsis txhob tso tawm tam sim no tas li. Nov yog lub tswv yim ntawm qhov tam sim no.

Feem ntau, txawm hais tias nws yog lub zog hluav taws xob tsis tu ncua lossis lub zog siv hluav taws xob tas li, lawv yeej tseem zoo ib yam. Lawv cov zis yog qhov hluav taws xob thiab tam sim no. Ntawm ob qhov ntau, cov khoom siv hluav taws xob tuaj yeem tswj tau ib qho ntawm lawv, lossis ua kom lub zog ruaj khov, Ib qho ruaj khov tam sim no, lwm qhov ntau yuav tsum tau txiav txim siab los ntawm kev tiv thaiv kev thauj khoom, thiab kev tiv thaiv kev thauj khoom yog txiav txim los ntawm tus neeg siv, yog li ib qho ntawm ob qhov ntau ntawm cov khoom siv hluav taws xob yuav tsum txiav txim los ntawm tus neeg siv. Tsuas yog ua raws li lub tswv yim, raws li Ohm txoj cai, nws tuaj yeem siv los ntawm tus neeg siv, nws tsis muaj teeb meem seb qhov hluav taws xob tso tawm thiab cov zis tam sim no tuaj yeem muab tib lub sijhawm.


Sijhawm Tshaj Tawm: Aug-26-2021