A: Hello! This is because:
1 The charger generally uses a switching power supply, which has a large capacity filter capacitor inside the coating. When plugged in, due to the charging of the capacitor, there will be electric sparks.
2 This is also normal, because the plug of the mobile phone charger is inserted into the socket when the current passes, so there should be an instant spark inserted near the back can not be seen.
3. It may also be caused by aging of the socket, poor contact, or rust on the surface of the copper sheet.
normal phenomenon
If you use vivo mobile phone, when the charger is connected to the socket, due to the small contact area of the pin,
The surge current generated instantaneously will cause electrical sparks or arcs, which will form black spots on the surface of the charger pin, which is a normal phenomenon.
This is because the charger is powered by the filter capacitor inside, if the socket is powered, the charger is plugged into the socket the moment the mains power is rectified to charge the filter capacitor.