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 feem ntau, peb feem ntau tsis suav, tab sis qhov tsis kam ntawm tus neeg xyuas pib. fuse yog pom tseeb loj dua qhov tsis kam ntawm qhov sib npaug ntawm cov hlau ntev, 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 lij choj: 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, 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 kom sov, uas yog, tag nrho cov hluav taws xob hluav taws xob hloov mus rau hauv lub zog, Q=W ntawm lub sijhawm no. Yog li ntawd, thaum kuv los yog U yog siab tshaj qhov ntsuas tus nqi, Q yuav loj dua, yog li ntawd lub fuse tsis tuaj yeem ua rau lub sijhawm kub dissipation thiab overheating, thiab nws thiaj li fused.
Feem ntau, thaum tam sim no lossis qhov hluav taws xob ntawm lub voj voog ntau tshaj qhov ntsuas tus nqi, lub fuse yuav tsis tshuab tam sim ntawd, vim hais tias lub fuse yuav tso cai rau ib tug ntau dua tam sim no los yog voltage tus nqi, tso cai rau ib tug luv luv lub sij hawm ntawm kev ua hauj lwm ntau tshaj. Qhov ntawd yog hais tias, yog tias koj pom qhov hluav taws xob tam sim no lossis qhov hluav taws xob tsis zoo, koj tseem muaj lub sijhawm ntawm kev kho, tab sis 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 los ua fuse. hlau ntes hluav taws, tuaj yeem pom ua ntej tiv thaiv tsuas yog, tsis khuv xim lub sijhawm.