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目前,大多数电脑的外部设备(如显示器、多媒体音箱、打印机、扫描仪、甚至外“猫”等)均通过各自的220V交流电源插头单独供电。每次使用电脑时需要逐个开、关外部设备的电源,十分麻烦。而且有时关掉主机电源后会忘了关其它外部设备的开关,既费电又会缩短设备的使用寿命,甚至还可能酿成火灾等严重事故。
Currently, most computer peripherals (such as monitors, multimedia speakers, printers, scanners, and even external “cats”) are individually powered by their own 220V AC power plug. Each time you use the computer one by one to open, turn off the power of external devices, very troublesome. And sometimes turn off the host after the power will forget to switch other external devices, both the power will shorten the service life of the device, and may even lead to serious accidents such as fire.