Re: 110V to 220V

From: John Paul Adrian Glaubitz <>
Date: Mon, 11 May 2015 14:05:58 +0200
Message-ID: <>
On 05/11/2015 01:34 PM, Michał Pleban wrote:
>> Out of curiosity, what country are you moving to? The US has long had
>> 120V line power now while all of Europe and Australia are on 230V.
> I didn't know it's 120V now (like EUrope used to be 220V and now it's
> 230V), but hopefully it won't make a big difference for the transformer?

Depends on the transformation ratio. Back in the days, when the US had 
110V and Europe without the UK had 220V (the UK had 240V), the 
transformers were usually rated at 1:2 such that the line voltage would 
be doubled.

However, if you used such a transformer these days, the input voltage of 
120V would be transformated to 240V which would be at the upper maximum 
of the allowed input voltage of a classic 220V device due to the line 
voltage tolerance.

This assumes that the output voltage in the US would stay constant at 
120V which might not be always the case. Power companies only guarantee 
a stable line frequency with minimal tolerance (less than 1%), but the 
line voltage may deviate by +/-10% and still be 100% be with the tolerance.

So, make sure you get a transformer than converts 120V to 230V, i.e. a 
ratio of about 1:1.9.


  .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer -
`. `'   Freie Universitaet Berlin -
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Received on 2015-05-11 12:06:07

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