Uhlelo oluhambisanayo luwukuxazulula inkinga yokuthi ibhethri elinamandla aphezulu lishaja ibhethri elinamandla aphansi ngenxa yomehluko we-voltage phakathi kwamabhethri.
Ngoba ukumelana kwangaphakathi kweseli yebhethri kuphansi kakhulu, ngakho-ke amandla okushaja aphezulu kakhulu, okuyinto engaba yingozi. Sithi i-1A, 5A, 15A ibhekisela kumandla alinganiselwe okushaja ibhethri.