Originally published at: http://www.howtogeek.com/168564/what-you-need-to-know-about-power-outlets-and-voltages-when-travelling-internationally/
When you leave the country, you don’t just have to worry about different currencies and languages — you also have to worry about different plug shapes and electricity voltages. There’s no one standard socket shape or voltage.
Whilst we are talking about travel, this never ceases to amaze me that more people don't think about this:
You only need to buy 1 adaptor/voltage converter.... then plug that in to a splitter to split the current into 4 or 6 plugs. Then use that... no need to buy 10 adaptors etc!
Not every country has a standard plug. India has one that's unique, for example. It's best to ask the hotel where one is planning to stay in advance what the outlet on the wall looks like; I travel with three (India, a 3/2 prong and one universal-most-everywhere-but-India). Voltage is easy enough to figure out but there may or may not be an adapter wall plug available to borrow.
Here is the best place to find whatever adapter or converter you need.
I bought a few different step-up/down converters & plugs from them for AU, years ago now & they still have great prices & shipped fast (at the time).
PS- my young daughter blew up two US game systems thinking she only needed the adapter (sigh).