everything runs on 60 hertz in the US, Europe is 50. thats why you should never, if you're traveling to Europe, take your alaram clock with you. alarm clocks measure time by the hertz which is sixty, so if you take it to europe where it runs at fifty, you will be late.


i'm an electrician

edit: correction from my previous post: it switches from postive to negative not once every second, but sixty times.