Why does the Xiaomi Induction Cooker Lite sometimes spark when plugging in the power cord to the socket?

When most household appliances are powered on, there is a momentary surge current, and there may be a slight spark between the socket and the plug. If the conductive copper sheet of the socket is deformed or loose, the spark may be more noticeable. We recommend using a switch-equipped socket from a reputable brand for better safety.