In a circuit, electricity leaves a power source, goes through some things to do some sort of work, whether it’s operating a computer, turning a fan or generating light, and then returns to the power source. That’s why batteries have two ends and why electrical outlet always have at least two prongs.
A short circuit is when the electricity takes a shortcut — when it leaves the power source and finds a way back to the power source without having done any work. So, for example, if you take some scissors and cut a wire that’s plugged into the wall, the electricity will go down one of the conductors in the wire, hit the scissors and go back to the wall on the other conductor.
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