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AC adapter means alternating current. Alternating current A current that changes direction at regular time intervals. The AC adapter is used to convert the voltage of the external AC power to the rated voltage required by the IT equipment to meet the power requirements of the equipment.
When using an AC adapter, you should know the input voltage range of the power adapter, preferably a universal AC100-240V voltage input.
Although the output voltage and current of the power supply vary in a small range, the overcurrent and overvoltage protection points are accurately tested and set by the manufacturer. Different computers have different load resistor values. Once the computer has a circuit failure, the power adapter can play a protective role.
Currents whose strength and direction change periodically over time are called alternating currents. The electricity used by our common lamps and motors is alternating current. China's unified rated voltage is 220V, and the mobile phone charger is equivalent to a small transformer. The 220V high-voltage pulse is converted into a 5V low-voltage pulse by the mobile phone charger, and then directly converted into a 5V DC power through the conversion and stabilization of the charger, which is the "constant voltage" function.
The transformer on the mobile phone charger converts alternating current. It is converted into DC by a rectifier circuit and then charged to the mobile phone, that is, DC. Of course, for charging safety, you must choose a charger produced by a regular manufacturer.
