Why is there a spark when the Xiaomi Multifunctional Rice Cooker 4L is plugged into the power cord?

General electrical devices will generate the surge current at the moment of power, which will cause a slight spark between the socket and the plug. In addition, if the conductive copper strip in the socket is deformed or loose, the sparking will be more noticeable. It is recommended to use a high-quality socket with an independent switch.