When you're travelling internationally, you just need a normal travel adapter, right? Well, in most cases, yes. If you just ...

出国旅行时携带的电器因电压不兼容而罢工的尴尬经历，引出全球电压标准为何会有差异的问题。在民用电压上，为何我国使用220V，而美国、日本等国家用110V，背后是历史偶然还是技术必然？电压高低的背后又涉及哪些物理学与经济学知识？ 华商报大风新闻 ...

I've just purchased a used HP 33U server rack to use in my house for A/V and other equipment but it currently has a built-in power strip (and fans) that plug into a 220 volt outlet. The guy I ...