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Uruguay uses 220V at 50Hz mains power supply similarly to European countries. The plugs are mostly type F, commonly known as Schuko:
Or type C, commonly known as Europlugs:
(source: worldstandards.eu)
Coming from France, this means that in most cases you will not need an adaptor. However, you might find other types of sockets - type I and type L - for which an adaptor is required. This assumes that you are using appliances with type F plugs.