What type of transformer will convert 120V-60HZ US into U.K.voltage?

Answer 1

The standard residential nominal voltage in the UK is 230 V (-6%/+10%). So, for the purpose of selecting a transformer, a 1:2 ratio, 120/240 V, transformer will be an appropriate choice.

The capacity (volt ampere rating) of the transformer must match or exceed the power rating of the proposed load. You should be aware, though, that Transformers will not change the frequency of the supply, only its voltage.

Another thing to be considered is the transformer's country of manufacture and where you intend to use it. For example, if the transformer is manufactured in the US, then it will be designed to operate at a frequency of 60 Hz.

On the other hand, if it is manufactured in Europe, then it will be designed to operate at 50 Hz.

A transformer designed to operate at 60 Hz will overheatif it is operated at 50 Hz, whereas a transformer designed to operate at 50 Hz will operate without overheating if operated at 60 Hz.

This means that you will be able to operate a European transformer in the US without any difficulty, but operating a US transformer in Europe will result in overheating -unless it is operated BELOW its rated primary/secondary voltage.

So if you intend operating a US made transformer in Europe, then you should obtain a 1:2 ratio transformer, but one rated at, say, 240/480 V. This will then operate without overheating at 120/240 V.