Should I buy a mouse or a keyboard according to the current and voltage?

In fact, this problem is not alarmist, because when the USB interface just came out, it often happens that the USB interface is burnt out or even the motherboard is burnt out because of the short circuit of the device. But the protection measures of modern motherboard and USB interface are very good. No matter overload or short circuit, the interface and motherboard will not be burned out, so you don't need to care too much about this problem. In fact, the system cannot accurately know the power and power consumption of the keyboard and mouse. What is shown here is only a reference standard value, and it is only used to calculate the power supply. You can often hear the sound of keyboard and mouse disconnected. Yes, there are problems with the motherboard and the keyboard and mouse. Troubleshooting: If it is damaged, it should be replaced. You can try to connect it with another good keyboard. If the sound is not disconnected, it can be concluded that there is something wrong with the keyboard or keyboard connection interface, and it should be repaired or replaced. If there is nothing wrong with the buttons, there is something wrong with the motherboard. There are usually several USB ports on a computer. Try plugging the keyboard into another interface. If there is no disconnection sound, there is something wrong with the previous interface. Repair this interface. Notebooks generally do not have the problem of front and rear interface power supply. If it is a desktop, the power supply of the rear USB interface is more sufficient than that of the front USB interface, but the keyboard consumes less power and is generally not affected by power supply. The problem of USB interface of keyboard and mouse is ruled out, only the problem of motherboard is left, which needs professionals and professional tools to repair and solve. When using USB2.0 expansion cards, you can usually refer to the above principles. However, sometimes there are different situations: as mentioned above, the AIC 1526 card is used, the first card 1526 is supplied to Port 1 and Port2, and the second card 1526 is supplied to Port3 and Port4. When an external hard disk box connects port 2 and port 3, there will be insufficient power supply. However, if you connect to port 1 and port 3, everything is fine. It stands to reason that both channels on an AIC 1526 can supply 500mA of current, not to mention that when it is connected to Port2 and Port3, the two chips of 1526 supply power together, which does not exist in the same chip. The problem of high total supply current leads to heat generation, especially when switching to Port 1. It can only show that the two channels of the power chip may have asymmetric power supply in design, but the card circuit is not deeply analyzed. ?