Ukumelana kuqhathaniswa lokushisa

Omunye izici noma iyiphi impahla kagesi conductive - lokhu ukumelana kuqhathaniswa lokushisa. Uma umelwe igrafu ku indiza bazihlela ngokubambisana, lapho zinkathi ibhalwe eksisi evundla kabili (t), kanye mpo - ukubaluleka ukumelana ohmic (R), khona-ke sithola umugqa eziphukile. Ukwencika lokushisa yokumelana schematically sinetigaba letintsatfu. Eyokuqala uhambelana ukushisa encane - kulokhu ukumelana bushintsha kancane kakhulu. Lokhu kwenzeka iphuzu elithile, ngemva kwalokho emgqeni kugrafu ukhuphuka kakhulu - lena ngesakhiwo yesibili. Okwesithathu, ingxenye yokugcina - is ngqo welula phezulu kusukela iphuzu lapho wayeka R ukuphakama, engela elincane kuya eksisi evundla kabili.

Okwakushiwo bomzimba walo igrafu okulandelayo: ukumelana lokushisa ukwencika umqhubi ochazwa elula ezothando eqondile nje Ukushisa ubuningi ingeqi inani elithile isici kule nto ethile. Ngokwesibonelo Lapha abstract: uma + 10 ° C ukumelana okokusebenza 10 ohms ke ukuze 40 ° C ukubaluleka R ngeke kushintshe, asele ngaphakathi kwemikhawulo Iphutha nesilinganiso. Kodwa ngisho ngaleso 41 ° C ngena ukumelana oyakuvuka ohms 70. Uma okunye ukwanda lokushisa ngeke ayeke, ngayinye degrees okwalandela ziyokuwa i olwengeziwe 5 ohms.

Le mpahla kabanzi lisetshenziswe kumadivayisi ahlukahlukene zikagesi, ngakho ngokwemvelo kubangele idatha ku zethusi njengomunye wezinye izinto ezivame kakhulu imishini kagesi. Ngakho, i-umqhubi ukushisa zethusi ababezithola phansi benze ngamunye ezengeziwe degree ukwanda ukumelana kuholela isigamu amaphesenti ukubaluleka ethize (okutholakala amatafula ebaluliwe, isethelwe 20 ° C, 1 m kwesigaba omude 1 mm²).

Esimeni a metallic umqhubi amandla electromotive EMF livela kagesi lamanje - ukunyakaza iqondiswe izinhlayiya aphansi nge kwenkokhelo. Ion ekhona ISIZINDA ka eheleni crystalline we metal, akakwazi ukubamba electron eside omise zawo zangaphandle, ukuze bakwazi ukuhambisa ngokukhululeka kulo ivolumu impahla komunye engeyokuqala kwesinye. Lokhu ukuhamba okungahleliwe kubangelwa amandla kwangaphandle - ukushisa.

Nakuba iqiniso ukunyakaza likhona, it is hhayi iqondiswe, Nokho akuthathwa njengephutha zamanje. Lapho le nsimu kagesi, ama-electron, kuthambekele ngokuhambisana ukumisa yayo, ukwakha ukunyakaza iqondiswe. Kodwa njengoba umphumela ezishisayo azizange zinyamalale, izinhlayiya nemiyalezo ezihambayo zishayisane ensimini iqondiswe. Ukwencika ukumelana izinsimbi kanye lokushisa likhombisa inani ukugxambukela ukuze ukudlula zamanje. Ayanda lokushisa, ayanda umqhubi R.

Isiphetho esisobala: ukunciphisa izinga Ukushisa zingancishiswa kanye ukumelana. Umumo wokwakha (20 ° K) nje elinesimo ukunciphisa abalulekile ezishisayo ezinyakazayo kunezinxushunxushu izinhlayiya ngaphakathi izidakamizwa.

Cabanga izakhiwo impahla conductive kabanzi lisetshenziswe Ihluzo Elingafaki Ukuqoka. Ngokwesibonelo, ukwencika ukumelana umqhubi lokushisa asetshenziswe izinzwa electronic. Ukwazi inani layo okwesikhathi impahla ethile kungenziwa ekhiqizwa thermistor, ixhume kudivayisi yokufunda digital noma analog, enze ezifanele lokulinganisa esikalini futhi lusetshenziswe esikhundleni ukuze thermometer mercury. At inhliziyo izinzwa eziningi zalezi zinsuku ezishisayo wabeka ngokunembile lesi simiso, ngoba nokwethenjelwa ephakeme, kanye nomklamo kulula.

Ngaphezu kwalokho, izinga lokushisa ukwencika ukumelana Ukushisa kwenza kube nokwenzeka ukubala motor Windings.