You Do Need power plug adapter while traveling from Great Britain to United States of America (US) USA.

Here is Why You Need An Adapter

The outlet and plug type used in United States of America (US) USA are A and B and in Great Britain is G. This is how they look like.

In Great Britain, outlets of type G are in use.

Type G

In United States of America (US) USA, outlets of type A and B are in use.

Type A

Type B

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