Our dormitory lights out every day 1 1, but the mobile phone is not enough to charge. A friend said that if you don't pull down your mobile phone when there is a power failure, the current will flow b

Our dormitory lights out every day 1 1, but the mobile phone is not enough to charge. A friend said that if you don't pull down your mobile phone when there is a power failure, the current will flow backwards. Is it true?/You don't say. Your physics is very poor. There is an element called "diode" in the charger, which only allows the current to pass in one direction.

The main feature of diode is unidirectional conduction, that is, under the action of DC voltage, the on-resistance is very small;

However, under the action of reverse voltage, the on-resistance is extremely large or infinite. Because diodes have the above characteristics, cordless phones usually

It is used for rectification, isolation, voltage stabilization, polarity protection, coding control, frequency modulation and static noise.

So what you said above is absolutely impossible.