The mbụ chọpụtara onu nke itinye n'ọkwa onye Michael Faraday, itinye n'ọkwa onu bụ ihu ọma a eriri igwe nke conductive ihe onwunwe (dị ka ọla kọpa). Ugbu aga site na eriri igwe, na a ndọta na-eme na gburugburu eriri igwe. The ike nke ndọta-eme ihe na-adabere na eriri igwe imewe na ego nke ugbu a site na eriri igwe.
Ntụziaka nke ndọta-adabere na ntụziaka nke ugbu a. Ya mere, mgbanwe ntụziaka nke nwetụ ugbu a site na eriri igwe na-akpata ntụziaka nke ndọta ịgbanwe, na ọnụego mgbanwe bụ otu ihe ahụ dị ka na ọnụego nke mgbanwe nke nwetụ ugbu a. 50 Hz AC akpata ndọta ịgbanwe ugboro 50 n'ime otu abụọ. 400 kHz AC akpata ndọta ịgbanwe 400,000 ugboro otu abụọ.
Mgbe a workpiece nke conductive ihe a na enịm ke a na-agbanwe agbanwe ndọta (dị ka a ndọta N'ịbụ ihe nwetụ ugbu a), a voltaji na-eme n'ime workpiece (Faraday iwu). The rata voltaji ga-eme ka eruba n'ime electrons: nke a bụ ugbu a! The ugbu a site na workpiece bụ na ncherita-ntụziaka nke ugbu a na eriri igwe. Nke a pụtara na anyị pụrụ ịchịkwa ugboro nke ugbu a na workpiece site ịchịkwa ugboro nke ugbu a na eriri igwe.
Mgbe ugbu a na-aga site na-ajụ, ije nke electrons nwetara ụfọdụ ndị na-eguzogide. Nke a na-eguzogide na-egosipụta site okpomọkụ (Joule kpo oku mmetụta). Ọ bụ ezie na nke ukwuu na-eguzogide nke ihe eruba n'ime electrons ka nke ugbu a na-aga site na ihe onwunwe, na ihe okpomọkụ na-eme, ọ na-ekwe omume ka ikpo ukwuu conductive ihe onwunwe (dị ka ọla kọpa) site na iji rata ugbu a. Nke a na onu dị ezigbo mkpa ka itinye n'ọkwa kpo oku.
-Ekwu, a set nke itinye n'ọkwa kpo oku usoro gụnyere: ike esenyịn,
ọkụ ahụ na mmiri jụrụ akụkụ.
Foundry, ibe ya bụrụ, Tempering, Quenching.etc