Usoro YFB4 bụ ihe ejikọtara nke ọma, onye na-akwado squirrel-cage chase atọ asynchronous electric induction moto. Ọ dị ntakịrị, ìhè, a pụrụ ịdabere na ya ma mara mma. Ọ dịkwa mma, dị jụụ, dị nro ma dị jụụ. Nnukwu, arụmọrụ dị elu, nchekwa na ntụkwasị obi.