Kalmar “haɗin kai” ba daidaitaccen kalma ba ne a cikin harshen Ingilishi ko a fannin kimiyyar lissafi ko injiniyanci. Duk da haka, kalmar "conductance" tana nufin iyawar wani abu ko da'ira don gudanar da wutar lantarki, kuma yawanci ana auna shi da siemens (S) ko mho (Ω⁻¹).A cikin injiniyan lantarki. da kimiyyar lissafi, ana siffanta gudanarwa azaman ma'anar juriya, wanda aka auna cikin ohms (Ω). Saboda haka, sashin gudanarwa zai zama juzu'in na'urar ohm ko naúrar siemens. Duk da haka, tun da an riga an yi amfani da naúrar siemens don auna halin aiki, kalmar "ɗayarwa" ba a saba amfani da ita ba.