Fuses yog ua los ntawm cov hlau lead-antimony alloy hlau nrog cov ntsiab lus qis melting thiab resistivity. Lawv hu ua fuses. Qhov voltage-constant resistor muaj peev xwm txheeb xyuas cov micro-tam sim no tshaj qhov ua haujlwm ntau. Lub resistor yuav tsum muaj ntau dua tam sim no rau fuse, uas tuaj yeem hlawv cov khoom siv hluav taws xob tab sis tsis fuse nws. Cov ntsiab cai no siv cov nyhuv thermal ntawm tam sim no los tswj qhov ntws ntawm tam sim no.
Lub fuse tso cai rau tam sim no ntws raws li cov qauv Q=IRT. Lub resistor ua kom sov dua thiab yooj yim rau fuse. Nws ua lub luag haujlwm tiv thaiv thiab muaj kev sib raug zoo nrog Joule txoj cai. Txawm li cas los xij, tej yam hauv lub neej tsis yooj yim li ntawd. Lub fuse tsis tuaj yeem loj. Nws tsis tuaj yeem me me dhau. Yog tias nws loj heev, nws yuav yooj yim hlawv cov xov hlau hauv tsev lossis ua rau hluav taws kub. Yog tias nws me dhau lawm, nws yuav yooj yim fuse thiab ua rau muaj teeb meem tsis tsim nyog.
