Why does the Xiaomi Instant Hot Water Dispenser produce sparks when the power cord is inserted?

It is normal for the Xiaomi Instant Hot Water Dispenser to produce a brief spark when the power cord is inserted. This is due to the sudden surge of electrical current that occurs when the device is powered on, causing a minor spark between the plug and the socket. However, if the socket's conductive copper pieces are deformed, loose, or of poor quality, the sparking will become more noticeable. To ensure safe operation and minimize the occurrence of sparks, it is recommended to use high-quality sockets that provide a secure and stable connection.