The wall of my house often makes a "wave" sound, and at this time, the lights will also flash. Why is this?

1, this is the phase line in your home appliance line (commonly known as live wire, which will light up when measured with an electric pen). At the moment of flashover, the fault point produces discharge sound due to electric shock, which is similar to the principle of lightning, but the voltage is different. Especially in wet weather, it will happen more. Please find a professional electrician to handle it. No big deal.

2. Old-fashioned large-screen color TV (the kind of picture tube) will have a loud "pa" sound after it stops. You should judge for yourself.