1) Multi-phase oberecircuit n’ime transformer. 2) Tụgharịa-na-atụgharị oberecircuit, winding na ígwè isi ma ọ bụ shei mkpụmkpụ sekit. 3) Ígwè isi ọdịda. 4) A ga-enwe ma ọ bụ ntapu mmanụ n’okpuru ala mmanụ. 5) Onye na-agbanwe mgbata na kọntaktị adịghị mma ma ọ bụ ịgbado ọkụ waya esighi ike.