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SESK: Stuff Everyone Should Know · sesk.info/wt-britain-voltage

What is the nominal voltage of British wall sockets?

Britain runs on 220/240 volts AC at 50 hertz.

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  1. 100 volts
  2. 230 volts ✔
  3. 240 volts

Why: Britain's nominal mains power is 230 volts at 50 hertz. Before plugging in a US appliance, check that it is rated for that voltage.

Huh, didn't know that: A plug adapter changes the plug shape. It does not convert voltage or frequency.

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British sockets run on 240 volts, which is how charged up I get when my bag comes out first.
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References

Answer: 230 volts. Britain's nominal mains power is 230 volts at 50 hertz. Before plugging in a US appliance, check that it is rated for that voltage.

  1. United Kingdom travel adaptors (Electrical Safety First) www.electricalsafetyfirst.org.uk/safety-advice/travel-advice/united-kingdom
    United Kingdom operates on a 230 V supply voltage and 50 Hz frequency
    Checked 2026-10-12.
  2. United Kingdom travel adaptors (Electrical Safety First) www.electricalsafetyfirst.org.uk/safety-advice/travel-advice/united-kingdom
    It is important to note that it does not convert the voltage or frequency.
    Checked 2026-10-12.

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