Its worth double checking to be sure but as far as I know all laptops sold in the last 5 years or so will work on 110v to 240v. See what it says on your power supply or give the make and model number so that we can check the manufacturers website, or look at the manual.
Tenerife uses 220v (10 less than us) and a regular European 2-pin power outlet. The outlets vary though, you can have either type C (Spanish), type E (French) or type L (Italian). However a standard 2-pin European adapter should fit in all three of these, and this will convert it to a UK 3-pin socket that you can plug your laptop lead into.