The light keeps flickering slightly after turning off the light at night, and the jack only works when the light is off, and the jack doesn't work when the light is on, what should I do? Wait online,

The light keeps flickering slightly after turning off the light at night, and the jack only works when the light is off, and the jack doesn't work when the light is on, what should I do? Wait online, urgent, thank you all! The socket also has - a wire, i.e. *** three wires, two for change and fire, the other is the return wire for the switch.

When the light is turned off, the switch will have the zero and fire wires, and one of the wires is coming through the light, so the socket can be used while the light is working, which means that the light is in series with the electrical appliances on the socket.