As we've established, the multimeter's current measurement settings can only safely handle so much current, and its really easy to accidentally exceed that amount of current just by touching the wrong parts on your breadboard.

So how does the multimeter protect itself, so the entire device doesn't get destroyed, and you have to throw it away and get a new one, any time you accidentally measure too much current? With a part called a fuse. Here I'll explain how fuses work, then I'll intentionally destroy the one in the meter, and show you how to replace it and bring the meter back to life.