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EmPower is a 15 volt DC connector type found on many commercial airlines designed to provide power to travelers' electronic devices. The system is limited to 75 watts.〔EmPower Product Description () www.astronics.com Accessed 2011-01-16〕 The use of a special connector is to prevent laptops charging at altitude and ensure that only approved adapters can be used. Some airlines offer it only in business class or only in certain types of aircraft or flights. Travelers can buy EmPower adapters, frequently from duty-free shops at airports, that allow them to run laptops and other electronic equipment without using battery power. Supporting airlines include: *Some Air France flights *Some Air India flights *Some British Airways flights *Some Delta Air Lines flights *Some US Airways flights *Some United Airlines flights *Some Virgin Atlantic flights *Almost all Alitalia flights *Almost all Cathay Pacific flights *Others (The SeatGuru web site contains more detailed information on which flights support EmPower) Adapters exist to connect EmPower plugs to cigarette lighter receptacles and most EmPower power adapters come with these. EmPower is a trademark registered initially by Primex Technologies (VA) and assigned to Astronics advanced electronic systems, Inc in Kirkland, Washington, USA. Subsequently, the trademark has been expanded to include not just the proprietary DC 15 V connector but also the AC 120 V 60 Hz in-seat power (and video entertainment) systems. American Airlines uses EmPower 120 V AC outlets (standard 2 prong plus ground) on their newer 737s. Many laptops will not function properly at 75 W. The new〔 111101 astronicsaes.com〕 AC 60 Hz EmPower system provides more power than the DC system.〔 111101 astronicsaes.com〕 The AC EmPower system converts aircraft AC 400 Hz or wild frequency power to standard AC 60 Hz to prevent additional stresses in laptop chargers already stressed by reduced cooling at altitude. 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 AC 110 V 60 Hz even if sold in AC 230 V 50 Hz markets. Apple offered an EmPower Magsafe power adapter for their MacBook, MacBook Pro, and MacBook Air lines of notebooks, and also includes a cigarette lighter socket adapter. However, this system only runs the computer and will not charge the computer's battery, and Apple warns users to never plug this device into a car's cigarette lighter outlet.〔 Accessed 2015-11-10.〕 This product has since been discontinued. Even though EmPower adapters are rated at 15 volts instead of 12 volts like cigar lighter receptacles, most accessories made for the so-called "12-volt outlets" have enough voltage tolerance to allow for a voltage as high as 15 without step down DC-to-DC converter. == References == 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「EmPower (aircraft power adapter)」の詳細全文を読む スポンサード リンク
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