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xkcd #3211: Amperage
(imgs.xkcd.com)
Title text:
Oh, and do you have any tips on how to vacuum up copper that's melted into your carpet?
Transcript:
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Source: https://xkcd.com/3211/
Every circuit has a circuit breaker, it's just that sometimes the circuit breaker is the power cord or the product itself
'Fuse' would be more accurate.
18awg at 100A could be considered a fuse. Or a heating element. One of the two.
First one, then the other.