Ntawm nws cov tub ntxhais, cov khoom lag luam muaj peev xwm tuav tau qhov zoo siab 120A. Nrog rau qhov muaj peev xwm siab, koj tuaj yeem txuas koj cov khoom siv hluav taws xob ntau yam tsis muaj kev txhawj xeeb txog overloading koj circuits. Txawm hais tias koj tab tom khiav lag luam tshuab, them lub tsheb hluav taws xob, lossis khiav cov khoom siv hluav taws xob tshaib plab, lub qhov hluav taws xob no tuaj yeem ua tau yooj yim. Lub qhov (socket) yog tsim los nrog ib puag ncig interface, ua rau nws sib xws nrog ntau yam kev sib txuas. Qhov kev ua tau zoo no ua kom koj tuaj yeem yooj yim txuas koj lub cuab yeej thiab ua kom nws lub peev xwm tsis muaj qhov cuam tshuam ntawm kev nrhiav tus adapter tshwj xeeb. Tsis tas li ntawd, cov ntsia hlau tshuab ua kom muaj kev ruaj ntseg thiab ruaj khov, tshem tawm qhov kev pheej hmoo ntawm kev sib tsoo tsis sib xws.