What does the nominal voltage and current generated by the power adapter mean?

The nominal voltage of armored universal power supply refers to the open circuit output voltage, that is, the voltage when there is no external load and no current output, so it can also be understood that this voltage is the upper limit of the power supply output voltage. In the case of using active voltage regulator inside the power supply, even if the mains voltage fluctuates, its output is a constant value. Like a small transformer on the market, such as a power supply equipped with a walkman, if the mains voltage fluctuates, the output of the power supply will also fluctuate. Generally speaking, the real no-load voltage of a common power adapter is not necessarily the same as the nominal voltage, because the characteristics of electronic components cannot be exactly the same, so there is a certain error. The smaller the error, the higher the consistency of electronic components, the higher the production cost, so the more expensive the price. In addition, regarding the nominal current value, any power supply has a certain internal resistance, so when the power supply outputs current, there will be a voltage drop inside, which leads to two things. One is heating, so the power supply will be hot, and the other is to reduce the output voltage, which is equivalent to internal friction. Tiejia Electronics Co., Ltd. is a wholly-owned enterprise specializing in the production of high-frequency transformers, inductors and switching power supplies. Since its establishment in 2000, thanks to the friendly support and cooperation of businessmen, it has developed from a small scale to the present, and has set up branches in Jiangxi and Hunan. Our belief is "If we work hard, we can do better". Welcome sincere cooperation!