...how it works and 
Do I need a transformer to charge my MacBook overseas?
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I am currently overseas and the voltage here is 220, is it safe to charge my macbook pro at this voltage without using a transformer ? All I'm using is the little piece that makes the rods fit the outlet.
Note: Whenever I'm charing my laptop (overseas) I can feel tiny vibrations whenever I slide my fingers on the aluminum body. Will it damage my macbook pro ??
Thanks for your help.
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At 220V, it will take longer for the macbook to charge. No damage should occur. Check the rating on the macbook – usually there’s some sort of manufacturer’s tag on the underside. It will say V: 120-220V or something similar. That means it will be ok at 220V. That is a voltage range that the macbook can operate under. The higher the voltage goes, the lower the current will be, increasing the charging time for the macbook.