Fuse
Why does the fuse melt when the current is too high? Like how? Is it to do with heat?
Yup. The energy exchange of electrons with atoms, as they pass through the conductor, causes the atoms to increase their vibrational and rotational energy such that inter-atomic bonds can be broken. i.e. When the electron current is high enough, the increased kinetic energy causes the atomic structure to lose cohesion and the distance between them increases until conduction stops - if the current is high enough, the atomic structure literally flies apart and vaporises.
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