The standard input current of the USB socket is 500mA. However, it should be noted that the current of the USB interface is relatively constant, generally 500mA, and the notebook is only 100mA.
USB devices have the following advantages:
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1, can be heat exchange.
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2, easy to carry.
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3. Unified standards.
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4. Multiple devices can be connected.
The standard voltage of the USB interface is 5V and the standard current is 500mA. In actual use, according to the influence of various factors such as the computer motherboard and power supply, there may be errors, but the maximum cannot exceed \/-0.2V, that is, 4.8-5.2V.