Generally I would recommend an "official" Arduino Uno as it is most likely to be completely compatible with the sketch (program) and you know it will work out of the box (compared to an Arduino clone/kit that you assemble).
See Related Links for the official Arduino website as well as links to some resellers of the official Arduino Uno.
Have the Arduino control a relay that connects an external power source to the motor.
An Arduino is a microprocessor and circuit board that has been designed to make getting into working with microprocessors extremely easy. The Arduino project is open source to anyone can develop for it and there is a free tool that can be used to program the board.
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No, Arduino is AVR. Not ARM.
Arduino was created in 2005.
Pietro Arduino died in 1805.
Pietro Arduino was born in 1728.
Arduino Bertoldo died in 2012.
Arduino Bertoldo was born in 1932.
Arduino Berlam was born in 1880.
Arduino Berlam died in 1946.
Arduino Bertoli has written: 'Agusta'