Imitha yamandla kagesi ephezulu ifakwa ebhokisini, ngaphandle kwemitha yehora le-watt, ebizwa ngokuthi i-transformer ehlanganisiwe, kanye nohlobo lwangaphandle olucwiliswa ngowoyela we-AC (olufanele futhi ngaphakathi endlini).Kuyidivayisi yokulinganisa yokulinganisa ngokuqondile amandla asebenzayo nasebenzayo emigqeni yamandla kagesi aphezulu.Isebenza ku-AC yezigaba ezintathu ene-frequency elinganiselwe engu-50, 60Hz;10KV, 6KV, 3KV inethiwekhi yesistimu.Inezinzuzo zokunemba okuphezulu, ukusetha kabusha ukukhanya, ukufakwa okulula kanye nokulwa nokwebiwa kukagesi.Ngeningi leminyango ephakela ugesi yamukelekile. Ibhokisi lamamitha ezigaba ezintathu elinezintambo ezintathu lakhiwe ama-voltage amabili esigaba esisodwa kanye nama-transformer amanje, kanti ibhokisi lamamitha esigaba sesine lezintambo ezine lakhiwe ngama-voltage amathathu esigaba esisodwa kanye nama-transformer amanje.I-casing ifakwe kuphaneli, futhi indawo yangaphandle ifakwe imitha yehora le-watt-metering.