The voltage of USB is a little lower than that of the charger, but it takes a little longer to charge. Do not often use the USB interface to flush, only emergency use, otherwise it is bad for the battery.
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The reason why USB can be charged is to ensure that the data is lost when the phone is out of power.
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Universal Serial Bus (USB) is a serial bus standard and a technical specification for input and output interfaces, widely used in information and communication products such as personal computers and mobile devices, and extended to photography equipment, digital television (set-top boxes), game consoles, and other related fields. The latest generation is the USB4, which has a transfer speed of 40Gbit\/s, a three-stage voltage of 5V\/12V\/20V, a maximum power supply of 100W, and a new Type C interface that allows blind and reverse insertion.
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USB is an external bus standard that regulates the connection and communication between computers and external devices. The USB port provides hot swap function. USB interface can connect a variety of peripherals, such as mouse and keyboard.
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USB is in late 1994 by Intel and other companies jointly launched in 1996, has successfully replaced the serial port and parallel port, has become today's computer and a large number of smart devices must be equipped with the interface. The USB version has gone through years of development and has now evolved into version 3.1.
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For most engineers, the main obstacles to the development of USB2.0 interface products are: to face the complex USB2.0 protocol, to write their own USB device drivers, familiar with the programming of single-chip computers. This not only requires considerable VC programming experience, but also the ability to write USB interface hardware (firmware) programs. So most people gave up on developing their own USB products.
usb port is able to charge.
The USB device interface is 5V voltage, 500mA current, so it can be charged normally.
However, individual mobile phones are not recommended to use, after all, the USB interface is only a universal interface, and the charging device has its own charging requirements, which are diverse, if used as an emergency is OK. However, conventional use, one is slow charging, may affect battery performance. The second is that if the USB interface has a leakage problem, it is a harm to the mobile phone.
Rest assured, it can be charged normally, there is no problem at all, but it must be charged slowly, and the voltage cannot be unstable, and the charging process can be solved
You can charge your phone.
USB socket is a new rise of the socket, can intelligently identify computers, mobile phones and other electronic products with USB interface, in the choice of the best to choose an indicator USB socket, the indicator can show whether the contact is good, and the internal line is smooth, in terms of security has played a warning role. And you can choose a USB socket with a button or an automatic turn-off, so that USB does not have to run for a long time, power consumption, heat. And all sockets must be able to pass the 750℃ glowing wire test, that is, when it encounters an open flame, the socket shell will not appear flame.