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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.
IEEE P1823 was a proposed global standard for a universal power adapter for mobile devices (UPAMD) that require between 10 W and 240 W. E.g., Laptops, larger tablets and other mobile devices that can require much more power than the (non-Power Delivery) USB battery charging specification limit of 7.5 W at 5 V. [25]
Note that laptops on this system will still charge batteries. Modern laptop batteries, however include a temperature sensor that should compensate for the reduced cooling at altitude. This new system accepts various national power plugs and most laptop chargers will function properly at 120 V 60 Hz AC even if sold in 230 V 50 Hz AC markets.
Standard may include a limit of 20 V at 7.5 amperes [5] Sometimes, there's a knurled retaining ring surrounding the male plug which allows fastening the plug to the chassis receiving the power. Some connectors have a right-angle connector, as seen in the picture. For aesthetics, some Dell laptop chargers have a glowing ring at the connector tip.
0.80 Egston 213 2.50 0.80 Used in Samsung Bluetooth headsets and few tablet PCs 3.00 1.00 3.00 1.10 G CUI Inc. PP-019 Egston 214 Nokia ACH-6E charger Used in satellite radio docks and other devices. Acer, Samsung, Huawei chromebooks and/or laptops 3.20 0.90 CUI Inc. PP-017 3.30 1.00 Motorola AAPN4064A
Quick Charge is a proprietary technology that can charge battery-powered devices, primarily mobile phones, at power levels exceeding the 7.5 watts (5 volts at 1.5 amps) supported by the USB BC 1.2 standard, using existing USB cables. The higher voltage available allows more power (watts) to be supplied through wires without excessive heating.
Laptop charging trolleys, also known as laptop trolleys or laptop carts, are mobile storage containers to charge multiple laptops, netbooks, and tablet computers at the same time. The trolleys are used in schools that have replaced their traditional static computer labs [ 63 ] suites of desktop equipped with "tower" computers, but do not have ...
The usual reason for the limit is heat, and the maximum heat dissipation is calculated as above. Power ratings are usually given in watts for real power and volt-amperes for apparent power , although for devices intended for use in large power systems, both may be given in a per-unit system .
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