When replacing the power supply, how to identify the positive and negative poles of the DC output of the power adapter is usually a problem. Generally, the positive and negative poles of the power adapter are indicated on the nameplate. If there is no positive and negative identification of DC output, we can test with a multimeter.

Aircraft is one of the inevitable ways of travel in daily business and travel. However, when many netizens fly, they often want to take some things with them. For example, you can often see a computer charger. Many friends often ask, can I bring a charger before the plane takes off?

Is it dangerous to insert a charger into your hair? In fact, when the mobile phone is charged, the charger heats normally, which is related to the current intensity output by the charger and the ambient temperature.

What if there is water in the charger? If the charger is flooded, can it still be used? In fact, if operated properly, there are many opportunities to save chargers.