Uploaded June 2023 | Updated September 2026, 1 hour ago
Sometimes you get stuck in the bathroom because of a broken door.
At this time, you can escape using the shampoo pump.
This is a very useful survival tip.
Sometimes you get stuck in the bathroom because of a broken door.
At this time, you can escape using the shampoo pump.
This is a very useful survival tip.




![12V car bulb connect to 220V directly
This is series capacitor current limit circuit. Widely used in transformerless power supply.
However, it is dangerous because of the high potential difference with the ground.
In this kind of circuit, may damage the bulb by over current flows due to harmonics. (Current : 2 × π × f × C × V [A] ) 12V car bulb connect to 220V directly](https://i.ytimg.com/vi/4HI3JEzjyu8/mqdefault.jpg)





