Uma ugesi usetshenziswa, kungenzeka ukuthi uxhumeke ngendlela engafanele noma ube ne-short-circuited.Ngaphezu kwalokho, ukunikezwa kwamandla ngokwawo kungase kungasebenzi kahle futhi kubangele i-voltage ephumayo ibe engavamile.Ngakho-ke, ekwakhiweni nasekukhiqizeni amandla kagesi, ukucaciswa kokuphepha kuyingxenye ebaluleke kakhulu.Kunezici ezimbili ekuvikelweni kwamandla kagesi, enye iwukuvimbela ezinye izesekeli ukuthi zingashi, kanti enye iwukuzivikela ekulimaleni.
Ukuvikelwa kokuphakelwa kukagesi ngaphandle ngokuyinhloko kuwukuvikela i-over-voltage kanye ne-under-voltage, okusho ukuthi uma i-voltage ephumayo yesinikezeli sikagesi iphezulu kakhulu noma iphansi kakhulu ukuthi ibe engavamile, ukunikezwa kwamandla kuzoyeka ukusebenza.Lokhu kubaluleke kakhulu kuwo wonke umshini, ngoba izingxenye eziningi ezibizayo zibuthakathaka, futhi kulula ukuvutha ngenxa ye-voltage ephezulu.
Ukuze uvimbele lokhu, kuyadingeka ukuqapha i-voltage ngayinye yokuphuma kwamandla kagesi.Indlela yomklami wamandla iwukusampula amandla kagesi okukhiphayo ngesekethe yesampula, futhi isignali eyisampula ixhunywe engxenyeni yokulawula ngesiqhathanisi.Uma i-voltage ephumayo ingajwayelekile, isignali yesampula izobonakala ngokushesha, futhi ingxenye yokulawula izokwaziswa ukuthi ivale.Lokhu kungavikela ngempumelelo izingxenye zokuxhuma ezingemuva.Ukuthi ukunikezwa kwamandla kunokuvikelwa kwe-overvoltage okusheshayo kubaluleke kakhulu kuwo wonke umshini.Ukuze uvimbele ukutubeka okubangelwa amandla amaningi, amandla kagesi afakwe i-fuse.
