Power adapter (USB Charger) is a small, portable electronic devices and electrical and electronic power conversion devices, usually by shell, power transformers and rectifier circuit, its output can be divided into AC output type and DC output type; press connection can be it into the wall and desktop. In the broad support phone screen, game consoles, language video machines, Walkman, notebook computers, mobile phones and other devices.

First, the power adapter (hereafter referred to as power) of the rated voltage and current mean? First, the general nominal voltage power supply refers to the open circuit output voltage, which is not connected to any external load, the output voltage when no current, it will be appreciated that the upper limit of the power supply voltage is the output voltage.

The case for internal use and power regulator active element, even if the power supply voltage fluctuations, the output is a constant value, such as the market in general small transformers, such as Walkman and power, if power fluctuations, power output will not follow fluctuations.

Generally true no-load voltage is not necessarily the same general power adapter and the nominal voltage, because the characteristics of electronic components, may not be exactly the same, so there is some error, the error is smaller, the cost of production of electronic components for the conformance requirements high, so the price will be expensive.

In addition, with respect to the rated current value, regardless of any power supply has a certain resistance, so that when the power supply output current, generated in the interior of the pressure drop, which leads to two things, one is to produce heat, so power will heat, is directed to another output voltage decreases, the internal consumption of equivalents.

Secondly, it is the same nominal voltage, output current power supply is different, you can not use the same books?

Power supply voltage, output current is different and can not be used in the same books. The basic principle is that the rated current of power can replace the small nominal current power. Some estimates would think, the power of large nominal current will burn books, because the current big thing. Indeed, how many depends on the load current is the same voltage, Oh, think of junior high school physics will know.