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If you are talking about a plug rated at 20 A and not that the device it is attached to as drawing 20 A then nothing will happen unless the device along with other devices on the same circuit trip the breaker.

The rating of 20 A on a plug tells you the maximum current that should go through the plug. The 15 A breaker protecting the outlet ensures that no more than 15 A can go through your 20A plug.

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