The markings on the power adapter provide important information to help users understand the technical specifications and usage limitations of the adapter. These labels typically include key data such as input and output voltage, current, power, as well as certification and manufacturer information. Below are some common markings and their meanings on power adapters:

　　1. Input voltage range

　　Example of identification: 100V~240V AC, 50/60Hz

　　Meaning: This power adapter can operate within the range of 100 volts to 240 volts AC and supports frequencies of 50 hertz or 60 hertz. This means that the adapter can operate normally at the grid voltage in most parts of the world.

　　2. Output voltage

　　Example of identification: 12V DC

　　Meaning: Indicates that the DC voltage output by the adapter is 12 volts.

　　3. Output current

　　Example of identification: 1.5A

　　Meaning: Indicates that the adapter can provide a maximum output current of 1.5 amperes.

　　The power adapter

　　4. Output power

　　Example of identification: 18W

　　Meaning: Indicates that the maximum output power of the adapter is 18 watts. Output power is the product of output voltage and output current.

　　5. Positive and negative polarity

　　Example of identification:+or-

　　Meaning: Some adapters will indicate the positive and negative polarity to indicate the positive and negative poles of the output port. For example, "+" indicates that the positive electrode is at the center, and "-" indicates that the positive electrode is at the periphery.

　　6. Certification Mark

　　Identification examples: CE, FCC, UL

　　Meaning: These certification marks indicate that the adapter has passed the relevant electromagnetic compatibility tests. For example, CE indicates compliance with EU standards; FCC states that it complies with the regulations of the Federal Communications Commission in the United States; UL stated that it has passed the testing conducted by Underwriters Laboratories in the United States.

　　7. Manufacturer Information

　　Example of identification: manufacturer name, model, serial number

　　Meaning: Provide information such as the manufacturer's name, adapter model, and serial number for easy tracking and warranty services.

　　8. Warning signs

　　Example of identification: lightning symbol, warning text

　　Meaning: Warning users to pay attention to preventing dangerous situations such as electric shock and overheating.

　　9. Interface type

　　Example of identification: USB Type-C, DC circular interface

　　Meaning: Refers to the output interface type of the adapter, such as USB Type-C interface, circular DC interface, etc.

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