The cheapest and most common way to decrease 240V AC to ~120V for running an American-made appliance in Europe is by using a voltage converter or a step-down transformer. Here's how you can do it:
Check the Appliance Requirements: Before proceeding, ensure that your American-made appliance is compatible with the 50Hz European electrical system and can handle 120V. Some appliances might be designed only for 60Hz and could have issues with the frequency difference.
Get a Step-Down Transformer or Voltage Converter: Purchase a step-down transformer or voltage converter that can handle the power requirements of your appliance. For a 120V appliance, you'll need a transformer capable of converting 240V AC to 120V AC. Make sure the transformer's power rating (in watts) is higher than the power consumption of your appliance to avoid overloading it.
Plug Configuration: Check if the plug of your American-made appliance is compatible with European outlets. If not, you may need an adapter to fit the European socket.
Use the Transformer Correctly: Once you have the step-down transformer, connect your appliance's plug to the transformer's output, and then plug the transformer into the European power outlet. The transformer will convert the 240V AC to approximately 120V AC, allowing your appliance to function properly.
It's important to note that using a step-down transformer is a temporary solution for occasional use. If you plan to stay in Europe for an extended period or permanently relocate, it might be more cost-effective to consider buying a new appliance that is compatible with the European voltage and frequency.