Instructions

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The PTC fuse
All experiments use a fuse that kicks in when an error occurs.
If you accidentally cause a short circuit, a wire could become
red hot, or the battery could overheat and in the worst case
even explode. But the fuse can prevent this from happening.
Many fuses burn out easily when a short circuit occurs. But
this special fuse is different. It is a self-resetting fuse called
PTC fuse. If too much current flows in the event of a short
circuit, the PTC fuse becomes hot and allows very little cur-