Grid ɗin wata hanyar sadarwa ce da ke haɗa tashoshin samar da wutar lantarki zuwa manyan layukan wutar lantarki waɗanda ke ɗaukar wutar lantarki a wani ɗan nisa zuwa tashoshin wutar lantarki - "watsawa". Idan aka isa inda ake so, tashoshin wutar lantarki suna rage wutar lantarki don "rarrabawa" zuwa layukan wutar lantarki na matsakaici sannan kuma zuwa layukan wutar lantarki masu ƙarancin wutar lantarki. A ƙarshe, na'urar canza wutar lantarki a kan sandar waya tana rage ta zuwa ƙarfin wutar lantarki na gida na volts 120. Duba zane a ƙasa.

Ana iya ɗaukar grid ɗin gaba ɗaya a matsayin wanda ya ƙunshi manyan sassa uku: samarwa (shuke-shuke da na'urorin canza wutar lantarki masu ƙarfi), watsawa (layuka da na'urorin canza wutar lantarki masu aiki sama da volts 100,000 - 100kv) da rarrabawa (layuka da na'urorin canza wutar lantarki a ƙarƙashin 100kv). Layukan watsa wutar lantarki suna aiki a cikin babban ƙarfin lantarki mai ƙarfin lantarki 138,000 volts (138kv) zuwa volts 765,000 (765kv). Layukan watsa wutar lantarki na iya zama tsayi sosai - a cikin layukan jihohi har ma da layukan ƙasa.

Ga layukan da suka fi tsayi, ana amfani da ƙarfin lantarki mai inganci. Misali, idan aka ninka ƙarfin lantarki sau biyu, ana yanke wutar lantarki a rabi don daidai adadin wutar da ake watsawa. Asarar watsa layin daidai yake da murabba'in wutar lantarki, don haka ana yanke "asarar" layin dogon da kashi huɗu idan aka ninka ƙarfin lantarki sau biyu. Layukan "Rarrabawa" suna cikin birane da yankunan da ke kewaye kuma suna fitar da iska kamar itace. Wannan tsarin kamar itace yana girma daga tashar ƙasa, amma don dalilai na aminci, yawanci yana ɗauke da aƙalla haɗin madadin da ba a yi amfani da shi ba zuwa tashar ƙasa da ke kusa. Ana iya kunna wannan haɗin cikin sauri idan akwai gaggawa don yankin tashar ƙasa ya sami damar ciyar da ita ta hanyar wani tashar ƙasa daban.