I bought an Apple MacBook in the US and would like to use it in Italy. On the cable, it says: 2.5A 125V. What are the possible solutions to charge my computer? Use an adapter, a plug converter or an electric transformer? Someone can explain to me in details? In Italy, the voltage is around 220V, does it damage my pc if I use only a plug adapter?
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Apple makes their power adapters (cables) so that they will work worldwide (100-240V 50-60Hz) which means that you only need an adapter (plug) and not a converter. Apple sells a kit with the interchangable plugs for each country, but this isn't necessary and you can use any standard adapter.
Have another another look at the power adapter from Apple. Are you sure it only says 125V? If in fact it does not support 220V, then you'll need a converter. Buying a general purpose converter is difficult because it must be suitable for the type of appliance and they can be bulky and heavy. I'd recommend buying another power adapter from Apple that does support 220V (e.g. 100-240V 50-60Hz) which can be used worldwide.