Feeling electric shock while charging Mac book Pro

Hai everyone!
i just bought a Mac bookPro 15 inch 2.53 Ghz.
i am feeling a mild tingling/ vibrating shock while charging my mac book pro. i can feel the sensation all over the aluminium unibody part- especially while using the Mac book as well as charging it at the same time. is it Earthing/ grounding problem? or is it any voltage problem? or is it any problem with my Mac Book Pro?
Thanks and Regards
Chaitanya.A

"I bought my laptop from the US, but i am using it in Spain , with the aid of a plug converter (3 pong to 2 European one)...
"1) is this problem i am experiencing due to the plug converter?"
Yes and no. Outside of the US, the AC line voltage is twice as high, and that's why people outside of the US generally experience the "shock". If you use a 3-prong plug adapter inserted in a properly-grounded AC outlet, the problem will be resolved.
"2) I am staying in student resident, and so i doubt that the MBP is not properly grounded.. That would be dangerous, no??"
If you are using a 2-prong prong adapter, your unit is not properly grounded. Using an improperly grounded computer is not dangerous.
"3) Aside from being extremely annoying sensation, is it bad for the laptop??"
No.
"Because if not, i can always use another keyboard.."
You mean, "if it IS" a problem , you can use another keyboard. Using another keyboard is does not change the grouping scheme of the computer.
"I am not saying whose fault this is, but i only felt this shock with the mac book pro (15 inch).. i owned a power book and a 13 in mac book, and never felt a shock like this before... Could it be because of the placement of the battery on the laptop?"
No, it's because you're using a metal-cased computer, at a high AC input voltage.

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