And the color of the cable should also be unified, but some do not follow the rules, I have used a uSB plug,
One end plug is connected to the 5V power supply (charging treasure), the other end lead is connected to a booster module, because there is no measurement, the red line is positive and the black line is negative, the result is that the module is burned out, a quantity, the red line is negative, harmful
You can't. Because all equipment with direct current as a power source, the positive and negative terminals can not be connected wrong. If the positive and negative terminals are reversed, it will cause damage to the electronic components. Such as integrated circuits, transistors, electrolytic capacitors and other polar components. Although you can see that there are a lot of usb plugs can be inserted and used, but their internal positive and negative wiring is also opposite.
USB socket positive and negative, of course, can be connected at will, which is directly related to the nature of the use of the socket, the socket is different from other types of electrical equipment, its main function is to provide connected equipment in the building, the use of current, the installation of the positive and negative terminals randomly inserted into the socket switch, you can provide power for it, without deliberately dividing the positive and negative wiring