Power adapters come with several important technical parameters. One of the most crucial is the output voltage. The output voltage must match the requirements of the device it is powering. For example, if a device requires 5 volts to operate, using an adapter with a significantly higher or lower output voltage can damage the device. The output voltage is usually clearly marked on the adapter.

　　The output current is another key parameter. It indicates the maximum amount of current the adapter can supply. When choosing an adapter, the output current should be equal to or greater than the current required by the device. If the adapter's output current is too low, it may not be able to power the device properly or may cause the device to function erratically.

　　Efficiency is also an important consideration. A more efficient adapter will convert a higher percentage of the input power into output power, wasting less energy in the form of heat. High - efficiency adapters are not only more environmentally friendly but also tend to run cooler, which can extend their lifespan.

　　The input voltage range is also specified. This determines the range of AC voltages from the wall outlet that the adapter can accept. Adapters with a wide input voltage range, such as 100 - 240 volts, are more versatile and can be used in different regions with varying electrical standards. Additionally, parameters like ripple voltage, which is the small amount of AC voltage present in the DC output, can affect the performance of sensitive electronic devices. Low ripple voltage is preferred for high - quality power supply.

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