If your equipment is dual voltage you'll be OK with only an adapter. If it's not, you'll need a converter and an adapter. If you use only an adapter and you plug a 110v appliance into a 220v circute using only an adapter, there likely will be a little smoke, maybe a little fire and probably a blown circuit. In other words, your applicance will be toast!!

For a visual as to what that may look like, see "Just Married" with Ashton Kutcher and Brittany Murphy...

Starprotected

If you look on your appliance it should say 110 volts or 110-220 volts (on a sticker?). If it says 110-220 you can use it in spain with an adapter only. If it says 110 then you will need a voltage converter.

I hope this helps you.