They are widely used in North America, Mexico, China, Japan, and other countries which use Type A plugs. Like Type A, Type B plugs used in Japan vary in design slightly than those used in the United States.
People Also Ask
All of Europe operates on the same 2 round pronged outlets except for the UK and Ireland that operates on its own unique 3 flat rectangle pronged outlets. If you are travelling through the UK or Ireland (including London) you will need a UK and Ireland power point adapter.
Some UK electrical items can be used in the US, but as the UK voltages differs compared to the United States, others can't or will need significant adaptation. The standard UK voltage is 240v, whereas the United States standard voltage is 120v.