The standard current of the computer USB interface is 500mA (milliampere), that is, 0.5A.This value is determined according to the USB 2.0 specification and is applicable to most common devices, such as keyboard, mouse, camera, etc.
However, it should be noted that not all USB interfaces can provide full 500mA current.Some older or low-power devices may only provide less current, such as 100mA or 200mA.In addition, in some cases, if the system detects that a high-power device (such as a mobile hard disk or charger) is connected, it may automatically adjust the output current to meet the needs of the device.
In addition, USB 3.0 and USB Type-C interfaces also appear in modern computers.USB 3.0 can provide current output of up to 900mA (0.9A), while Type-C interface supports output of up to 3A or more.
In conclusion, when using the USB interface, pay attention to whether the connected device meets the requirements for the required electric flow, and ensure that the maximum load that the port can bear is not exceeded.
The maximum current output of a USB port is 500mA, and the actual output current is calculated according to the power of the connected device.Generally, the mouse and keyboard USB stick is about 100mA
The computer USB interface voltage is 5v, and the current varies according to the different output of the computer motherboard, generally 500ma, USB interface small appliances can be used on mobile phone chargers
The output voltage of the USB interface on the computer is 5V DC, and the output current is not more than 500mA. The USB interface voltage is 5V ± 5% to provide external voltage.It does not represent a constant 5V voltage.The USB2.0 is smaller, with only 3% fluctuation.The current of USB interface is relatively constant, generally 500mA, while that of laptop is only 100mA.The power supply mode of USB interface is divided into three types: main power supply+5V direct power supply, auxiliary power supply direct power supply, and power supply controlled by power regulator.5V----500mA The voltage of USB is 3.3V to 5V Current is 500mA to 1000mA 5V 500mA about The rear of the chassis should be higher There is a wire in front of the chassis Influence of line length Voltage ！！！
