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What is the meaning of the nominal voltage and current of the power adapter?

What is the meaning of the nominal voltage and current of the power adapter?

[Abstract]:
Generally speaking, the actual no-load voltage of ordinary power adapter is not exactly the same as the nominal voltage, because the characteristics of electronic components can not be exactly the sam
Generally speaking, the actual no-load voltage of ordinary power adapter is not exactly the same as the nominal voltage, because the characteristics of electronic components can not be exactly the same, so there is a certain error, the smaller the error, the higher the consistency of the electronic components , The cost of production is high, so the price is more expensive.
 
In addition, the nominal current value, regardless of any power supply has a certain internal resistance, so when the power output current, will produce a voltage drop internally, resulting in two things, one is the generation of heat, so the power will be hot, and the other One is to reduce the output voltage, which is equivalent to internal consumption.
 
What is the meaning of the nominal voltage and current of the power adapter (hereinafter referred to as the power supply)? First of all, the nominal voltage of a general power supply refers to the voltage of an open circuit output, that is, it does not receive any load from the outside and does not have current output voltage. Therefore, it can be understood that the voltage is the upper limit of the power output voltage.
 
For the internal use of the active voltage regulator components, even if the mains voltage fluctuations, the output is constant, as the market generally small transformers, such as walkman and the like with the power supply, if the mains fluctuations, The power adapter's output will fluctuate.