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Why does a short circuit strike a fire?
The current of the circuit is the same, only short circuit strikes a spark. It is because your short-circuit contact resistance is large (that is, poor contact). If the contact is good (such as connecting with terminals, or simply welding into a line, or even the same line), it will be different. Anyway, where the resistance is high, the heat is high, and the temperature is high enough to emit light. Just like welding.