Ụlọ ọrụ anyị bụ ọkachamara n'ịmepụta poselin eletrik.A na-ekewa ngwaahịa anyị dị ka ndị a dị ka ọdịdị, ọkwa voltaji na gburugburu ngwa ngwa: 1. Dị ka ụdị ngwaahịa ahụ si dị, enwere ike kewaa ya n'ime: diski nkwusioru insulator, pin insulator, rod insulator, oghere insulator, wdg ...
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