Ohm txoj cai rau kaw Circuit Court

Neeg twg uas tau xaiv cov kho thiab txij nkawm ntawm hluav taws xob sib kuv tshwj xeeb, zoo-paub cov lus ntawm cov xib fwb: "Ohm txoj cai rau kaw Circuit Court koj yuav tsum paub. Txawm waking nyob rau hauv lub hmo ntuj, nws yog ib qho tseem ceeb yuav tsum tau rau formulate nws. Vim hais tias nws yog lub hauv paus ntawm tag nrho cov hluav taws xob engineering. " Xwb, lub regularity sab ib tug zoo heev German physicist Georgom Simonom Ohm, pab cov tom ntej txoj kev loj hlob ntawm qhov kev kawm ntawm hluav taws xob.

Nyob rau hauv lub 1826 xyoo, kev thwmsim kawm cov zaj uas lub fais tam sim no los ntawm tus neeg xyuas pib, Ohm qhia ib tug ncaj qha kev sib raug zoo ntawm cov fais fab tam sim no nkag mus rau lub Circuit Court fais fab mov voltage (txawm hais tias nyob rau hauv cov ntaub ntawv no ntxiv lawm hais lus ntawm qhov electromotive quab yuam EMF) thiab tus kuj tus neeg xyuas pib nws tus kheej. Nyob tos tau theorized raws li ib tug tshwm sim nyob Ohm txoj cai rau ib tug raug kaw Circuit Court. Ib qho tseem ceeb feature: qhov tseeb ntawm lub qhia tau siv txoj cai lij choj yog siv tau xwb nyob rau hauv lub qhaj ntawv ntawm ib tug sab nraud puas tabkaum quab yuam. Nyob rau hauv lwm yam lus, yog hais tias, piv txwv li, tus neeg xyuas pib yog nyob rau hauv ib tug alternating magnetic teb, ncaj qha rau daim ntawv thov ntawm cov formulation tsis yooj yim sua.

Ohm txoj cai rau lub kaw Circuit Court tau raug pom tias nyob rau hauv txoj kev tshawb no ntawm qhov nyuaj schemes: ib lub hwj chim qhov twg los (muaj emf) ntawm nws ob terminals mus rau lub resistor yog conductors, nyob rau hauv uas yog ib tug qhia zog ntawm elementary hais tus nqi muaj. Li no, tam sim no yog ib qho ratio ntawm electromotive quab yuam rau tag nrho cov tsis kam ntawm cov Circuit Court:

I = E / R,

qhov twg E - lub electromotive quab yuam ntawm lub hwj huam mov, ntsuas nyob rau hauv volts; I - tam sim no, nyob rau hauv amperes; R - fais resistor, nyob rau hauv ohms. Nco ntsoov tias Ohm txoj cai rau ib tug raug kaw Circuit Court yuav siv sij hawm mus rau hauv tus account tag nrho cov Cheebtsam ntawm R. Nyob rau hauv cov lus teb kom tiav kaw Circuit Court los ntawm lub resistor R twb paub lawm ntau npaum li cas resistivity neeg xyuas pib (r), lub hwj chim qhov twg los (r0). Uas yog:

I = E / (R + r + r0).

Yog hais tias lub hauv kuj lub qhov r0 ntau dua qhov sum R + r, tam sim no tsis yog nyob ntawm seb cov yam ntxwv ntawm cov kev cob cog rua load. Nyob rau hauv lwm yam lus, qhov voltage nyob rau hauv cov ntaub ntawv no yog ib tug tam sim no qhov twg los. Yog hais tias tus nqi ntawm r0 yog me dua R + r, tam sim no yog inversely xwm yeem mus rau tag nrho cov sab nraud tsis kam, thiab lub hwj chim qhov twg los generates ib tug voltage.

Thaum ua tau zoo muaj tseeb suav coj mus rau hauv tus account txawm lub voltage tsis nyob rau hauv cov pob qij txha. Ib electromotive dag zog yuam yog txiav txim los ntawm ntsuas lub peev xwm sib txawv nyob rau hauv lub hwj chim terminals nyob rau kaw load (qhib Circuit Court).

Ohm txoj cai rau subcircuit siv Attendance feem ntau raws li lub voj kaw. Qhov txawv yog hais tias lub xam tsis coj mus rau hauv tus account lub EMF, tiam sis tsuas yog lub peev xwm sib txawv. Xws li ib tug zajlus yog hu ua homogeneous. Nyob rau hauv cov ntaub ntawv no muaj ib tug tshwj xeeb cov ntaub ntawv, uas tso cai rau xam cov yam ntxwv ntawm cov hluav taws xob Circuit Court rau txhua yam ntawm nws lub ntsiab. Peb sau nws nyob rau hauv daim ntawv ntawm ib tug formula:

I = U / R;

qhov twg U - voltage los yog tej zaum txawv nyob rau hauv volts. Nws yog ntsuas los ntawm ib tug voltmeter kev cob cog rua nyob rau hauv uas tig mus rau lub terminals ntawm probes ntawm tej lub caij (kuj). Cov uas ua U-nqi yog yeej ib txwm tsawg tshaj li tus EMF.

Ua tau, nws yog cov mis no yog lub npe nrov tshaj. Paub ob lub Cheebtsam ntawm lub mis, koj yuav nrhiav tau ib tug thib peb. Muab xam los circuits thiab ntsiab khiav lag luam los ntawm txoj kev txoj cai nyob rau hauv lub saw feem.

Ohm txoj cai rau ib tug sib nqus Circuit Court yog lom zem ntau zoo ib yam li nws cov txhais lus ntawm cov hluav taws xob Circuit Court. Es tsis txhob yog ib tug kaw sib nqus Circuit Court neeg xyuas pib siv, qhov no yog ib tug kauj winding nrog tam sim no dhau los ntawm lub windings. Raws li, muaj ib tug sib nqus flux kaw nyob rau magnetic Circuit Court. Sib Nqus flux (F), circulating los ntawm ib tug txoj kev ncaj qha nyob rau ntawm tus nqi MDS (magnetomotive quab yuam) thiab kuj muaj cov ntaub ntawv uas xeem tsis dhau tus magnetic flux:

F = F / rm;

qhov twg F - magnetic flux nyob rau hauv Weber; F - MDS nyob rau hauv amperes (tej zaum Gilbert); Rm - kuj, ua attenuation.