Lingaliro lazopitilira magetsi

Grid yamagetsi ndi zina zimasintha pamitundu ina, zimatha kupereka mphamvu yokhazikika yamagetsi.

Kodi pafupipafupi ndi chiyani? Kodi mphamvu yamagetsi yomwe ilipo nthawi zonse ndi yotani?

Zomwe zilipo nthawi zonse zimatha kutchedwanso kuti ndizokhazikika, zomwe ndizofanana ndipo siziyenera kusiyanitsidwa. Poyerekeza ndi lingaliro lamagetsi osasunthika, lingaliro lazomwe zimachitika pakadali pano ndi lovuta kumvetsetsa, chifukwa magwero amagetsi nthawi zonse amakhala ofala m'moyo watsiku ndi tsiku. Mabatire osungira ndi mabatire owuma ndi DC yamagetsi yamagetsi yamagetsi, pomwe 220V AC imatha kuonedwa ngati mtundu wa AC Mphamvu zamagetsi zamagetsi, chifukwa mphamvu zawo zotulutsa sizimasintha, sizimasiyana kwambiri ndikusintha kwazomwe zikupezeka pano.

Choyamba, perekani chitsanzo: mtengo wanthawi zonse womwe umasinthidwa kukhala 1A ndi mphamvu yayikulu yotulutsa mpaka 100V. Mukayatsa magetsi osinthira magwero apompopompo, muwona kufunika kwa voltmeter yamagetsi ndi mita yapano. Chani? Zitha kuwonetsedwa motsimikiza kuti zotulutsa zamagetsi ndi 100V ndipo zotulutsa zake ndi 0A. Winawake adafunsidwapo, kodi simukukhala komweko kwa 100V 1A? Chifukwa chiyani kutulutsa sikuli 100V 1A? Apa tikufunikirabe kugwiritsa ntchito lamulo la Ohm kuti tifotokoze. Mwachidziwitso, zikhoza kuwerengedwa motere: mphamvu yotulutsa mphamvu ya U = IR, kumene U ndi mpweya wotuluka, ine ndikutulutsa tsopano, ndipo R ndikutsutsa katundu.

Otsatirawa adagawika magawo 5 kuti afotokoze:

Ngati magetsi alibe katundu, R amatha kuyimiridwa ndi infinity, U = I * ∞, chifukwa magetsi amatha kutulutsa 1A pakadali pano, ngati magetsi ali 1A, ndiye U = 1A * ∞ = ∞, ndi magetsi amagetsi amangotulutsa 100V makamaka Mosakayikira, magetsi amatha kungotulutsa mphamvu yayikulu ya 100V. Popeza magetsi sangatulutse mphamvu yopanda malire, pakadali pano pangakhale phindu lochepa kwambiri, ndiye kuti, kutulutsa kwamakono ndi 0A, ndiye kuti, I = U / R = 100V / ∞ = 0A.

Ngati katundu akukaniza R = 200 ohms, ndiye chifukwa magetsi amangotulutsa 100V, pakadali pano pangakhale 0.5A, ndiye kuti, I = U / R = 100V / 200R = 0.5A

Ngati katundu akukaniza R = 100 ohms, chifukwa magetsi amatha kutulutsa 100V, pakadali pano itha kufika 1A, ndiye kuti, I = U / R = 100V / 100R = 1A, ndipo zomwe zikutulutsa pakali pano zimangofika pamtengo wokhazikika wa magetsi.

Ngati kulimbana ndi katundu kukupitilira kuchepa, sinthani kukhala 50 ohms. Malinga ndi chilinganizo I = U / R = 100V / 50R = 2A. Koma chinsinsi apa ndikuti magetsi athu ndi magetsi okhala ndi phindu lanthawi zonse la 1A, chifukwa chake zotulutsidwa pakadali pano Zitha kukakamizidwa kuti zizingoleketsedwa ku 1A m'malo mwa 2A, chifukwa chake mphamvu yamagetsi imatha kukakamizidwa kugwera ku 50V m'malo mwa 100V. Apa tikuyenera kutsatira malamulo a Ohm, ndiye kuti, U = IR = 1A * 50R = 50V

Ngati katundu akukana kukhala 0 ohm (ndiye gawo lalifupi), ndiye popeza kutulutsa kwamphamvu kungakhale 1A kokha, kutulutsa kwamphamvu kumangokhala 0V, ndiye kuti, U = I * R = 1A * 0R = 0V

Kuchokera pazitsanzo zisanu zapamwambazi, zitha kuwoneka kuti ngati kukana katundu ndikokulirapo, mphamvu zomwe magetsi akutulutsa sizingakwaniritse phindu lomwe lilipo, ndiye kuti mphamvu yamagetsi yamagetsi yomwe imakhalapo nthawi zonse imadzuka mpaka pazolowera kwambiri Mphamvu yamagetsi, pokhapokha kukana katundu kuli kochepa pamtengo winawake. Mphamvu zomwe zimatulutsa mphamvu yamagetsi zimafikira phindu lanthawi zonse, ndipo magetsi amakhala akugwirabe ntchito nthawi zonse. Ndikuchepa kwapang'onopang'ono kwa mphamvu yolimbana ndi katundu, magetsi omwe amatulutsa nawonso amatsika pafupipafupi kuti zomwe akutulutsa zizipitilira. Ili ndiye lingaliro lazopitilira zonse.

Mwambiri, kaya ndi magetsi amagetsi pafupipafupi kapena magetsi omwe alipo nthawi zonse, onse ndi ofanana. Zotsatira zawo ndi zamagetsi komanso zamakono. Pazinthu ziwirizi, mphamvu yamagetsi imatha kungolamulira imodzi mwamphamvu, kapena kuyimitsa mphamvu zamagetsi, Zomwe zingakhazikitse pakali pano, kuchuluka kwina kuyenera kutsimikiziridwa ndi kukana kwa katundu, ndikutsutsa katundu kumatsimikiziridwa ndi wogwiritsa ntchito, kotero imodzi kuchuluka kwa magetsi kumayenera kutsimikiziridwa ndi wogwiritsa ntchito. Malinga ndi malingaliro, malinga ndi lamulo la Ohm, itha kugwiritsidwa ntchito ndi wogwiritsa ntchito, zilibe kanthu kuti mphamvu yamagetsi ndi zotulutsa zake zitha kuperekedwa nthawi imodzi.


Post nthawi: Aug-26-2021