What does the nominal voltage and current of the power adapter mean? First of all, the nominal voltage of a general power supply refers to the open-circuit output voltage, that is, the voltage when there is no external load connected and no current output. Therefore, it can also be understood that this voltage is the upper limit of the power supply output voltage.

When active voltage stabilizing components are used inside the power supply, even if the mains voltage fluctuates, the output is constant. Like small transformers on the market, such as Walkman power supplies, if the mains voltage fluctuates, the output of the power supply will not fluctuate with it.