United States vs. European Electricity:
USA: 110-120 Volts 60 hertz
United Kingdom: 220-240 Volts 50 hertz
Electrical plugs have three rectangular pins and take fuses of 3, 5 and 13 amps.
You will need a transformer for appliances that have been brought in from other countries, such as laptops, hairdryers, and phone chargers.
If a device is dual voltage / hertz it only requires a simple plug adapter. If your device is dual voltage / hertz, its power source will be labeled: “110-240V, 50-60Hz”.
These may only require an adaptor of plug shape: if it is dual voltage or the correct voltage but the plug is not three-prong.
You must be sure the voltage is correct or it could ruin the device, or start an electrical fire.
An adaptor changes the shape of the plug, but the voltage must be 240V / 50 Hz.
A transformer changes the voltage so that a 110-120V / 60 Hz device can be plugged into the wall which conducts 240V / 50 Hz.
