ʻO ka mea hoʻohui ma ka manaʻo maʻamau e pili ana i nā ʻāpana electromechanical e hoʻopili ai i nā conductors (wires) me nā ʻāpana male kūpono e hoʻokō ai i ka pilina o kēia manawa a i ʻole ka hōʻailona a me ka wehe ʻana.Hoʻohana nui ʻia i ka aerospace, kamaʻilio a me ka lawe ʻana i ka ʻikepili, nā kaʻa ikehu hou, ka lawe kaʻaahi, nā mea uila uila, nā lāʻau lapaʻau a me nā ʻano ʻokoʻa ʻē aʻe.