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The AC adapter (AC/DC adapter) is a type of external power supply, often enclosed in what looks like an over-sized AC plug. Other names include plug pack, plug-in adapter, adapter block, domestic mains adapter, line power adapter, or power adapter. Informal terms include wall wart, wall cube and power brick. AC adapters are typically used with electrical devices that do not contain their own internal power supply. The internal circuitry of an external power supply is very similar to the design that would be used for a built-in or internal supply, but there are several advantages of separating the power supply from the main body of the electronic device, as explained below.
External AC adapters are widely used to power small or portable electronic devices, because of their advantages: Safety, Heat reduction, Electrical noise reduction, Weight reduction, Size reduction, Ease of replacement, Configuration versatilit and Simplified product inventory.
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source: Wikipedia: the free encyclopedia
