Question

Why were electrons chosen to be negatively charged? Wouldn't it make more sense to call electrons positively charged because when they move they make electricity?​

Answer 1

First of all, "electricity" does not mean "moving electric charge". If "electricity" meant "moving electric charge" then "static electricity" would mean "stationary moving electric charge," which is nonsense. "Electricity" is a general term describing all effects connected to electric charges. When people use the word "electricity" to describe what is going on in an electric wire, they usually mean "electric current".

Answer 2

According to the textbook "Physics for Scientists and Engineers" by Raymond A. Serway, Franklin identified electric charge carriers after a series of rubbing experiments. Without much knowledge of the underlying physics, he simply made a choice that made sense to him by calling electrons negative.