A na-eji brushes carbon, nke a na-akpọkwa brushes eletrik, n'ọtụtụ ngwa eletrik dị ka kọntaktị na-amị amị.
Ihe mkpuchi ọkụ eletrik bụ isi ihe dị mkpa maka imepụta ngwa eletriki (electronic), nke nwere mmetụta dị mkpa na ndụ nke ngwa eletriki (electronic) na ntụkwasị obi arụ ọrụ.
A naghị akọwapụta ugboro ugboro nke ndochi ahịhịa carbon. Dị ka ike nke carbon brush n'onwe ya
1, mkpuchi akwụkwọ teepu na mbụ mkpuchi akwụkwọ na premise nke ịkpụ ya n'ime dị iche iche widths.
Onye na-agagharị agagharị bụ akụkụ dị mkpa nke moto dc na AC commutator armature.