Why does the socket sparkle when you turn on the computer in the included surge protector?

Question

Computers

Why does the socket sparkle when you turn on the computer in the included surge protector?

Answer 1

The filter capacitors of the power supply are discharged; when they are charged, a strong short-term current pulse occurs. At the same time, when the plug is not fully inserted into the socket, it does not make good contact with the plates in the holes, small air gaps form for a short time. At this moment, the current pulse "pierces" the air, creating a small electric arc, due to the high temperature of which small particles of the metal of the plug and socket burn out in the air, which you see as sparks!
(correct if something is wrong, physicists)
By the way, it is because of this that all switches make a "click" so that the "contact-not contact" time is reduced to a minimum and sparking is eliminated