Power adapter notesWhat is the nominal voltage and current of the power adapter?First of all, the nominal voltage of the general power supply refers to the output voltage of the open circuit, that is, the voltage when there is no load outside and no current output, so it can also be understood as, this voltage is the upper limit of the output voltage of the power supply.Two, for the power supply internal use of active voltage stabilizer components, even if the power supply voltage fluctuations, its output is constant value, like the general market small transformers, such as walkman power supply, if the power supply fluctuations, the power supply output will not fluctuate.Generally speaking, the real no-load voltage of common power adapter is not necessarily the same as the nominal voltage, because the characteristics of electronic components are not completely consistent, so there is a certain error, the smaller the error, the higher the consistency of electronic components, the higher the cost of production, so the price is a little more expensive.Three, in addition, about the nominal current value, no matter any power supply has a certain internal resistance, so when the power supply output current, will produce pressure drop inside, resulting in two things, one is to produce heat, so the power supply will be hot, the other is to cause the output voltage to reduce, equivalent to internal consumption.Two, are the same nominal voltage of the power supply, the output current is different, can be used in the same laptop?Same power voltage, different output current, can be used in the same laptop.The basic principle is that a large nominal current source can replace a small nominal current source.One might think that a power source with a large nominal current would burn the laptop because the current is too high.In fact, how much current in the same voltage depends on the load, ha ha, think of junior high school physics will know.When the notebook high load operation, the current is larger, the notebook into stand。