The function of four usb wires of mobile phone.

The four wires of USB can't be connected randomly. There is a difference between them.

A USB data cable has four pins, two of which are used to connect data, and the other two are live power cables, including grounding.

1, the function of the red line: the positive pole of the power supply (the sign on the wiring is +5V or VCC).

2. The function of white line: negative voltage data line (marked as: Data- or USB port-)

3. The green line is used as a positive voltage data line (marked as Data+ or USB port+).

4. The role of the black line: grounding (marked GND)

Extended data

USB mainly has the following advantages:

1, which can be hot swapped. That is, when users use external devices, they don't need to turn off and turn on, but plug in USB directly when the computer is working.

2, easy to carry. Most USB devices are small and light, which is very convenient for users to carry a lot of data with them. Of course, USB hard disk is the first choice.

3. Uniform standards. Everyone is familiar with hard disk with IDE interface, mouse and keyboard with serial port, printer and scanner with parallel port. But with USB, these application peripherals can be connected to the same standard personal computer, and then there are USB hard disk, USB mouse, USB printer and so on.

4. Multiple devices can be connected. USB often has multiple interfaces on personal computers, which can connect several devices at the same time. If a USB with four ports is connected,

HUB, which can be reconnected; Four USB devices, etc., are connected as much as possible, and all your household devices can be connected to a personal computer at the same time without any problems.

Baidu encyclopedia -USB

Baidu encyclopedia -USB interface