Internal kuj thiab nws lub cev lub ntsiab lus

Txhua tam sim no qhov twg los nws muaj nws tus kheej nrog kuj. Cov hluav taws xob Circuit Court - ib tug kaw Circuit Court nrog tus neeg uas tus voltage yog thov. Txhua contour muaj sab nraud thiab sab hauv kuj.

Sab nraud kuj muaj rau tag nrho cov Circuit Court yog hu ua cov neeg thiab conductors, thiab Internal kuj los ntawm lub hauv paus.

Yog hais tias tam sim no qhov twg los yog ib qho hluav taws xob tshuab, ces nws nrog impedance yog muab faib mus rau hauv ib tug active, inductive thiab capacitive. Lub active neeg xyuas pib nyob rau nws kav ntev npaum thiab thickness, thiab cov ntaub ntawv los ntawm uas tus neeg xyuas pib, thiab nws cov kev mob. Inductive nyob rau hauv lub kauj inductance (nws magnitude emf) thiab cov capacitance generated ntawm lem ntawm lub windings. Nws yog ib heev me me. Yog hais tias qhov no yog ib tug pa roj teeb, cov kuj vim nws ntsha yog tseem tsim.

Tam sim no - yog ib tug qhia zog ntawm hais thiab cov kuj - yog los tsim ib qho chaw khuam siab rau nws lub zog. Tej obstacles no ces yuav tsum nyob rau hauv lub ntsha thiab cov hlau lead hauv cov phiaj ntawm cov roj teeb, nyob rau hauv luv luv, peb txog qhov twg muaj ib tug tam sim no.

Vim lub fact tias muaj yog internal kuj nyob rau hauv lub qhov chaw, nws yog tsis yooj yim sua kom ntseeg tau tias cov nro nyob rau hauv lub saw - qhov no yog ib tug ua tiav qhov twg los ntawm electromotive quab yuam. Ntawm cov hoob kawm, tus voltage nco nyob rau qhov twg los yuav tsum tsis quav ntsej li, tab sis tsuas yog thaum nws yog negligible.

Yog hais tias lub mov saw muaj dej tsaws ntxhee, lub davhlau ya nyob twg voltage yuav tsis muab suav hais tias muaj tseeb electromotive quab yuam. Tus tam sim no nyob rau hauv lub qhov chaw - yog ib tug kos npe rau ntawm lub voltage nco nyob rau hauv nws. Nyob rau hauv cov ntaub ntawv no, raws li txoj cai ntawm Kirchhoff, uas hais tias lub yeej muaj tseeb EMF saw - yog sum ntawm cov voltage dauv nyob rau hauv tag nrho cov chaw, xws li cov uas nyob rau hauv lub qhov chaw. Ib tug formula yog sau raws li:

E = ΣU + Ir r

qhov twg:

E - tag nrho cov electromotive quab yuam ntawm cov Circuit Court;
U - voltage nco rau hauv Circuit Court seem;
Ir - nrog tam sim no los ntawm cov chaw;
r - nrog qhov chaw impedance.

Yuav kom nkag siab txog cov lub cev lub ntsiab lus hauv cov kuj los qhov twg los, yuav tsum muaj ib co kev. Chiv ntsuas electromotive quab yuam qhov chaw. Qhov no yog ua los ntawm txuas ib voltmeter rau lub roj teeb, uas yog tsis nyob rau hauv load. Tom qab no, ib tug me me kuj cob cog rua nyob rau hauv series thiab ammeter teeb. Yog li, tam sim no yuav tsum paub tias, thaum nws yog tsim nyog los kuj ntsuas lub voltage nyob rau hauv load.

Specifying qhov tseem ceeb ntawm tag nrho cov yooj yim los mus txiav txim lub internal kuj. Ua li no, ua ntej ntawm tag nrho cov txiav txim los ntawm lub voltage nco nyob rau hauv lub roj teeb. Siv cov mis

Ur = EU

Peb ua suav.

Nyob rau hauv cov mis no:

Ur - poob lub internal qhov voltage kuj;
E - voltage (electromotive quab yuam) ntsuas ntawm qhov tsis muaj tus neeg;
U - voltage, ntsuas ncaj qha rau ntawm cov kuj.

Yog li, lub sab hauv kuj yog xam los ntawm cov nram qab no mis:

r = Ur / kuv

Ib cov kws txawj las mees cov nqi no, xav hais tias nws yuav tsis tau ignored vim hais tias ntawm lub me me nqi. Txawm li cas los, xyaum qhia tau hais tias rau txoj suav nrog kuj zoo heev cuam tshuam zaum kawg tshwm sim.