SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/trav-uk-voltage-transformer

A US appliance made only for 110V goes to the UK, where outlets give 240V. What does it need?

A step-down transformer, plus a plug that fits.

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  1. A step-down transformer ✔
  2. Just a plug adaptor
  3. A surge protector

Why: The US runs on 120V and UK outlets provide 240V. A plug adaptor only fixes the shape, so a single-voltage item needs a step-down transformer.

Huh, didn't know that: Trade.gov notes the UK socket differs from the US in both voltage and plug shape.

The dad joke
A plug adapter changes the shape of your plug, not your voltage. Like a costume, not a personality.
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References

Answer: A step-down transformer. The US runs on 120V and UK outlets provide 240V. A plug adaptor only fixes the shape, so a single-voltage item needs a step-down transformer.

  1. United Kingdom Business Travel, trade.gov www.trade.gov/country-commercial-guides/united-kingdom-business-travel
    the U.S. operating on a 120V supply voltage and the UK outlets provide a 240V
    Checked 2026-10-10.

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