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So for the transforming of voltage, a transformer could get a european outlet from 240 to 120 volts. How do these switch the frequency though, do they have to convert it into DC and then generate a signal back to AC? Or is there an easier way? Or do they just leave it at 50 hertz assuming everything is going to work properly?

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  • \$\begingroup\$ You need to clean up the English in your question to reduce confusion. For example, a transformer doesn't "get" a outlet, whether european or not. I think I see what you're asking, but I shouldn't have to guess and re-read the question a few times. You should take a little care and show a little respect when you're asking for a favor (free help in this case). Think of what the teacher would say if you handed in a homework assignment like this. Even if the teacher lets you get away with this, we have the right to some respect here. \$\endgroup\$ – Olin Lathrop Jun 15 '13 at 12:33
  • \$\begingroup\$ sorry i was really tired when I asked it \$\endgroup\$ – skyler Jun 15 '13 at 12:50
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Unless the frequency is critical to the operation of the device there is no attempt to change the frequency so all that is needed is a transformer with a 2: 1 ratio. Most devices simply change the AC to DC at a lower voltage. As the two frequencies are quite close there is usually no problem with circuit values.

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    \$\begingroup\$ Notice that the simplest devices of all don't even have a mains transformer, they just convert the plug's "form factor". \$\endgroup\$ – jippie Jun 15 '13 at 7:42
  • \$\begingroup\$ @jippie - you are quite correct - the very simplest don't even use a transformer. Many devices also have a built in switch so you can select the working voltage. \$\endgroup\$ – JIm Dearden Jun 15 '13 at 7:49

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