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1. The internal wire of the wire is too inferior. When the power is turned on, the high-voltage capacitor inside the computer ATX power supply should be charged instantaneously. At this moment, the current is relatively large, and the maximum current can reach 6 amps or more. If the computer ATX power supply is not designed with buffer inside. At this point, the circuit will have a larger inrush current, also known as an instantaneous surge. That is, at that moment, if the computer power cord uses inferior materials to make the wires, the resistance is relatively large, and the heat is also large, and a wire is burned out in an instant. (damaged in the middle of the wire or at a certain position)
2. The solder joints on both sides of the main power cord are not handled well. The two-sided joint refers to the joint on both sides of the power cord. Since the conductor is welded to the joint, if the solder joint area is too small, the resistance will be too large, and it is easy to instantaneously The contact point is burnt and blown. Even if it does not burn out in an instant, it will be too large due to excessive heat resistance, and excessive heat generation is a major cause of oxidation acceleration. The oxidation resistance to a certain extent is also greater, and eventually it is instantaneous burnout. (damaged at the two end connections of the wire)
3. The connector of the wire and the connector of the power cable and the connector of the power cable are connected to the ATX power supply of the host. If the two ports are in poor contact or the contact is too loose, the electric spark is easily caused, that is, the contact between the conductor metal piece and the metal piece. It is not so good that the contact area is too small, the area is too small, the allowable current is small, and the resistance is large, it is easy to heat and burn, because the current reduction is not enough to reduce the heat, because the heat Q=I*I *R, it is obvious that a slight decrease in I and a slight increase in R do not change the overall heating tendency of Q. Therefore, it is easy to see burnt black at the interface.
