Lub fuse muaj tus nqi tsis kam. Qhov tseeb, txawm tias cov hlau muaj qhov tsis kam, tab sis qhov tsis kam ntawm cov xov hlau me me (qhov xwm ntawm tus neeg xyuas pib). Nyob rau hauv kev xam cov Circuit Court feem ntau, peb feem ntau tsis suav, tab sis qhov kev tiv thaiv ntawm lub fuse yog pom tseeb loj dua qhov tsis kam ntawm lwm cov xov hlau ntev. Nyob rau hauv txoj kev no, nws tuaj yeem ua lub luag haujlwm hauv kev tiv thaiv Circuit Court.
Lub fuse yog cim nrog "5A 250V", qhia tias qhov siab tshaj plaws tam sim no tso cai rau dhau los ntawm fuse yog 5A, uas yog hu ua qhov ntsuas tam sim no; qhov siab tshaj plaws ntawm 250V tso cai kom dhau, hu ua qhov ntsuas hluav taws xob. Yog tias qhov tam sim no lossis qhov hluav taws xob ntau tshaj qhov ntsuas tus nqi, lub fuse yuav raug yaj kom tawg rau hauv Circuit Court, uas tiv thaiv cov khoom siv hluav taws xob (yog tias tsis muaj fuse, cov khoom siv hluav taws xob yuav raug hlawv).
Lub fuse melting thiab cov hauv paus ntsiab lus yog txoj cai ntawm Jiao Er. Txoj cai ntawm Jiao Er: Lub tshav kub uas tsim los ntawm qhov tam sim no los ntawm tus neeg xyuas pib yog proportional rau lub square ntawm tam sim no, uas yog proportional rau qhov tsis kam ntawm tus neeg xyuas pib, uas yog proportional rau lub sij hawm rau lub hwj chim. Jiao Er Law Mathematics Express: Q=I²RT, cov qauv xa tawm yog q=uIT thiab q=U²2 / R × T. Tag nrho cov kev ua tiav hauv qhov tam sim no hauv lub fuse tsim cov cua sov , uas yog, tag nrho cov hluav taws xob hluav taws xob tau hloov mus rau hauv lub zog sab hauv. Lub sijhawm no, Q=W. Yog li ntawd, thaum kuv lossis U ntau dua li tus nqi ntsuas, Q yuav loj dua, kom lub fuse tsis tuaj yeem overheated hauv lub sijhawm, thiab thaum kawg melted.
Feem ntau, thaum lub Circuit Court tam sim no lossis voltage tshaj qhov ntsuas tus nqi, lub fuse yuav tsis raug txiav tam sim ntawd, vim tias lub fuse tso cai rau lub sijhawm luv luv ua haujlwm dhau los ntawm qhov loj dua tam sim no lossis qhov voltage. Hauv lwm lo lus, yog tias koj pom tias qhov hluav taws xob tam sim no lossis qhov hluav taws xob tsis zoo, koj tseem muaj lub sijhawm los kho qhov yuam kev, tab sis rau qhov yuam kev yuam kev (xws li luv luv Circuit Court kab), kev tuav pov hwm yuav raug ignited yog tias lub kev tuav pov hwm tsis lig dhau lawm. Ua tib zoo saib xyuas kev tiv thaiv, tsis muaj caij nyoog los khuv xim.