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An AC adapter or AC/DC adapter (also called a wall charger, power adapter, power brick, or wall wart) [1] is a type of external power supply, often enclosed in a case similar to an AC plug. [2] AC adapters deliver electric power to devices that lack internal components to draw voltage and power from mains power themselves.
A DC connector (or DC plug, ... some Dell laptop chargers have a glowing ring at the connector tip. ... A 12–Volt cigar lighter plug.
External power supply could send data about itself (power, current and voltage ratings) to the computer. For example, genuine Dell power source uses 1-Wire protocol to send data by third wire to the laptop. The laptop then refuses a non-matching adapter. [35] Some computers use a single-voltage 12 V power supply.
IEC Technical Specification 62700: DC Power supply for notebook computer is an IEC specification of a common standard for external laptop computer AC adapters.Laptops and AC adapters following this standard will have interchangeable power supplies, which will enable easy reuse of used power supplies (thereby reducing electronic waste) and make buying a new compatible power supply for a laptop ...
Common DC power connectors A coaxial power connector is an electrical power connector used for attaching extra-low voltage devices such as consumer electronics to external electricity . Also known as barrel connectors , concentric barrel connectors or tip connectors , these small cylindrical connectors come in an enormous variety of sizes.
On Dell, HP and Toshiba laptops, sleep-and-charge USB ports are marked with the standard USB symbol with an added lightning bolt or battery icon on the right side. [83] Dell calls this feature PowerShare, [84] and it needs to be enabled in the BIOS. Toshiba calls it USB Sleep-and-Charge. [85]
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