Check this web-site for universal hairdryers

Learn the effect of 50 Hertz motors on 60 Hertz

This line frequency stuff makes my head hertz

Electricity around the world

Electricity Light and power information

plug adapters

History 50/60 Hertz

AC history

Television around the world

History of television

Help for travelers around the world

http://electronics.howstuffworks.com/motor.htm

http://www.kropla.com/electric.htm#plugs

Step-up/down transformer for USA

Variable transformers

50 60 hertz converter solid state

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