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12V is a more important power value among electrical appliances. It has its own power cord, and the color displayed on each power cord is different.

　　Yellow: +12V

　　 Yellow is a relatively common color in power cords, especially with the continuous development of the computer industry. CPU and PCI-E graphics cards also have their own power supply components. The power cord for this power supply is yellow +12V.

　　 The yellow +12V has always been the basis for energizing computer hard disks, optical drives and other spindle motors and other home appliances, so that electrical appliances can be used normally. Take a computer as an example. If there is no yellow power cord, it will not be able to boot and run normally. Because all parts of the computer have yellow power cords.

　　 If the yellow power cord cannot supply power normally, the computer will have various symptoms. When the voltage output of +12V is abnormal, it is easy to cause the instability of the readability of the hard disk and the optical drive; when the voltage is too low, the phenomenon of the optical drive picking up is serious, making the hard disk prone to bad sectors and causing the system to crash; When the voltage is too high, the operating speed of the optical drive is very fast, and it is easy to get out of control. Therefore, when using the yellow +12V power cord, you must ensure its quality so that the power can pass through and the machine can work normally.

　　Blue: -12V

　　 Yellow represents positive 12V, the blue power cord is just the opposite, it represents -12V. The power cord provides a logical judgment level for the serial port, and the current passed is not very large, generally only below one ampere. Although the impact is relatively small, it cannot be easily removed, because once the power cord is missing, the electrical appliance cannot be used normally.

　　 12V is an important value in electrical appliances. The colors of the power cord are yellow and blue, which helps people to see the meaning at a glance.

Article from: http://www.elejintao.com/newsd-nid-59.html