Lub peev xwm tawg, qee zaum hu ua kev cuam tshuam muaj peev xwm, yog qhov siab tshaj plaws ntawm amps lossis volts uas lub Circuit Court breaker tuaj yeem cuam tshuam. Txhua lub cuab yeej tsim los cuam tshuam cov hluav taws xob tam sim no tuaj yeem muaj ntau tshaj li ib lub peev xwm tawg vim tias qhov voltage nws raug cuam tshuam rau tus naj npawb ntawm amps nws tuaj yeem cuam tshuam.
Thaum ib tug tam sim no siv rau ib tug fuse ntawm cov pa unfusible tam sim no thiab cov rated breaking muaj peev xwm teev nyob rau hauv cov txheej txheem, lub fuse yuav tsum ua hauj lwm txaus siab yam tsis muaj kev puas tsuaj rau ib puag ncig. Qhov yuav tsum tau ua txhaum tam sim no ntawm lub voj voog uas lub fuse muab tso rau yuav tsum tsawg dua li qhov ntsuas qhov muaj peev xwm tam sim no tau teev tseg hauv tus qauv. Txwv tsis pub, thaum lub fuse raug tshuab, nruam arc, ignition, fuse hlawv, melting nrog rau qhov chaw, fuse cim unrecognizable tshwm sim. Tau kawg, ntawm qhov tsis zoo fuse ua txhaum qhov yuav tsum tau muaj peev xwm tsis ncav cuag tus qauv los teeb tsa, qhov kev puas tsuaj uas ua ntej - tau hais tuaj yeem tshwm sim zoo ib yam thaum siv.