Currently Being ModeratedMay 16, 2012 9:36 AM (in response to nhrev)
Look at the charger and see what it says about voltage supplies on there. Does it say anything about 110/220-240?I don't know about Macs but some devices are smart and can detect different voltages and adjust accordingly.
Of course whatever the voltage you will need to make sure you have the correct plug adapter to fit into the sockets in Spain..
Currently Being ModeratedMay 16, 2012 10:44 AM (in response to nhrev)
Recent MagSafe power bricks can work in the 100-240VAC / 50-60Hz range, that practically covers the whole civilized world. Only thing to worry about is what kind of plug is available at the destination. You can get cheap NEMA to whatever adapters at the airport duty-free shop or RadioShack, or go in style and purchase at the Apple Store the official Apple Travel Kit that contains all the different plugs and cables for the power brick.