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.

Can I use the same laptop with the same power supply voltage and different output currents. The basic principle is that a power supply with a large nominal current can replace a power supply with a small nominal current. Some people may think that a power supply with a large nominal current will burn out the notebook. In fact, how much current depends on the load at the same voltage. When the notebook is operating at a high load, the current is higher. When the notebook enters standby, the current is lower. A power supply with a large nominal current has sufficient current margin.