Hi Everyone
Im from country uses (220 volt , 50 Hz) and I bought a device from another country works at (110 volt, 60Hz), I want to use this device in my county, does it work if I connect it with an external resistor in series (just to absorb the extra voltage), if no then what should I do?
No you should not use a resistor like that.
There are power converters for this purpose.
Try a Google or eBay search for '220v 110v adapter'
Its possible your 110v 60Hz device wont run on 50Hz, the converters normally only convert voltage.
What Arduino does your 'device' use ?
I didn't use Arduino with this device, I'm just posting here to benefit from your experiences
This is an Arduino forum.
There are plenty of general purpose electrical forums for asking questions, for instance;
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Ok I will do, many thanks 
Of course, maybe if you actually explained what top secret "device" this is, people here might actually be able to assist you. 
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get a converter. it is not expensive. but do not use resistors
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ok thanks, will do
it's not a secret but not important too, i thought i mentioned all the related information
Then neither is your question.
Of course, it is the single most critical detail in the whole question! 
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