Foreigner health science video

It's not what you saw in the video. There are many clips in the video, indicating that the battery life is not as long as in the video. The principle is simple. You can see that the charging line without rectifier is alternating current, and there are many devices on the light bulb. What you can see clearly is field effect tube, rectifier tube and inductor. I think the purpose is to store the extra working energy of alternating current at that moment (part for the light bulb and part for the device). Then take away the charging cable, which means that the charging device supplies power to the light bulb, and the energy is still conserved. I think it can last for a few seconds at most, and most of the videos are edited.