Litšoantšo tsa ho fana ka matla a ho fetola li batla li le joalo: tokiso --- ka potoloho ea switching --- ho AC-frequency e phahameng ---phetoho ka transformer ea maqhubu a phahameng --- tokiso, tlhotla --- DC. Matla a mantlha ao re a sebelisang hangata ke 50hz, 'me matla a 50hz AC a lakatsa ho fetoloa ka transformer, Leha ho le joalo, lebelo le tlase le fella ka hore ho be le phefo e atolositsoeng ea transformer, e etsang hore transformer e be boima ebile e bitsa mehala e mengata. Ka mor'a ho fetoha motlakase o phahameng oa maqhubu, ho ka sebelisoa transformer e nyane haholo ho theoha, ho boloka boleng le sebaka.