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An AC adapter or AC/DC adapter (also called a wall charger, power adapter, power brick, or wall wart) is a type of external power supply that delivers electric power to devices that lack internal components to draw voltage and power from mains power themselves. Learn about the modes of operation, advantages, and safety issues of AC adapters, and see examples of different types of wall warts.
A coaxial power connector, also known as a barrel connector, is an electrical power connector for low-voltage devices. Learn about its construction, sizes, standards, and locking features.
Learn about the HP Pavilion dv9000 series of laptops, introduced in 2006 and discontinued in 2008. Compare the features, specifications and models of this 17.0" laptop with dual SATA drive bays and HP QuickPlay.
Learn how to identify the polarity of electrical devices and adapters using a black dot and a broken circle with plus and minus signs. The neutral symbol is the plus sign connected to the dot, while the positive or negative symbol is the minus sign connected to the broken circle.
It must be plugged into a high-power USB power adapter, such as the HP TouchPad power adapter or a newer high-current USB adapter. HP shows a warning in the user manual to not plug it into a laptop. In North America, the Touchstone ships with the same AC power adapter that is included with the TouchPad.
Learn about different types of DC connectors that supply direct current power, such as cylindrical, snap and lock, Molex, and XT connectors. Compare their dimensions, ratings, polarity, and compatibility with various devices and applications.
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