Lub fuse muaj tus nqi tsis kam, qhov tseeb, txawm tias cov xaim kuj muaj qhov tsis kam, tab sis qhov kev tiv thaiv ntawm cov hlau yog me me (qhov xwm ntawm tus neeg xyuas pib), hauv kev xam cov Circuit Court, peb feem ntau tsis suav, tab sis qhov tsis kam ntawm lub fuse yog pom tseeb loj dua qhov tsis kam ntawm cov hlau sib npaug, kom nws tuaj yeem ua lub luag haujlwm ntawm kev tiv thaiv Circuit Court.
Lub fuse yog cim nrog "5A 250V", qhia tias qhov siab tshaj plaws tam sim no tso cai los ntawm fuse yog 5A, uas yog hu ua qhov ntsuas tam sim no. Qhov siab tshaj plaws tso cai voltage ntawm 250V yog hu ua qhov ntsuas hluav taws xob. Yog tias qhov tam sim no lossis qhov hluav taws xob tshaj qhov ntsuas tus nqi, lub fuse yuav tshuab, ua rau lub voj voog tawg thiab yog li tiv thaiv cov khoom siv hluav taws xob (yog tias tsis muaj fuse, cov khoom siv hluav taws xob yuav hlawv tawm).
Lub hauv paus ntsiab lus ntawm fuse tshuab yog Joule txoj cai. Joule txoj cai: cov cua sov tsim los ntawm qhov tam sim no dhau los ntawm tus neeg xyuas pib yog proportional rau lub square ntawm tam sim no, mus rau qhov tsis kam ntawm tus neeg xyuas pib, thiab rau lub sij hawm siv hluav taws xob. Joule txoj cai: Q=I²Rt, Q=UIt thiab Q=U²2/R×t Tag nrho cov hauj lwm ua los ntawm cov tam sim no nyob rau hauv lub fuse ua cua sov, uas yog, tag nrho cov hluav taws xob hluav taws xob hloov mus rau hauv lub zog, Q=W ntawm lub caij no. Yog li ntawd, thaum kuv los yog U yog siab tshaj tus nqi ntsuas, Q yuav loj dua, yog li ntawd lub fuse yuav tsis tau raws sij hawm tshav kub dissipation thiab overheating, thiab nws thiaj li fused.
Feem ntau, thaum tam sim no lossis qhov hluav taws xob ntawm Circuit Court tshaj qhov ntsuas tus nqi, lub fuse yuav tsis tshuab tam sim ntawd, vim tias lub fuse yuav tso cai rau tus nqi tam sim no lossis qhov hluav taws xob ntau dua, tso cai rau lub sijhawm luv luv ntawm kev ua haujlwm ntau dhau. Uas yog hais tias, yog hais tias koj nrhiav tau Circuit Court tam sim no los yog voltage tsis zoo li qub, koj tseem muaj lub cib fim ntawm kev kho, tab sis mus rau qhov yuam kev ntawm kev sib deev kev sib deev (zoo li lub cev luv luv), qhov kev pov hwm yuav tsis muaj sij hawm txhob lo lo ntxhuav fuse ua hlau ntes hluav taws, tuaj yeem pom ua ntej tiv thaiv xwb, tsis khuv xim lub sijhawm.