Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
전기 모터의 정류자는 전류의 방향을 바꾸는 역할을 합니다.jeongi moteoui jeongnyuja-neun jeonryu-ui banghyang-eul bakkuneun yeoghal-eul hamnida.The commutator of an electric motor serves to change the direction of the current.