When is it actually practical to use a fuse? Like lets say your building a robot using an Arduino.....what area would you want to protect the most with a fuse?
I mean do they even make fuses that small (5v's and such) and how do you go about "connecting" them to wires, since the smaller ones seem to be a solid cylinder
Answer
You need a fuse if you want to limit possible damage if something got shorted. This is defenetly possible with non-protected LiIon batteries for example.
For low-voltage applications there are self-healing fuses (often found on motherboards, especially for USB protection).
For non-autonomous robot I would just have 1 fuse on battery, so that it would not burn.
For autonomous one you might need one per each power consumer + sensors to react on shorted engines e.t.c.
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