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Approximately how how many watts does an average laptop draw ?

[I'm in Thailand, have a Compaq Presario V2000 laptop bought in the USA. Thailand has 220 volt electricity,... and I intend to buy a transformer. Transformers come with various wattage ratings. So,.... ???]
 

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I would check the power brick to see if it's compatible as-is. A lot of electronics- newer transformers usually- are compatible with just a plug adapter. It was in this way that I was able to charge my mp3 player overseas.

If it turns out that the brick isn't compatible with that voltage, use the wattage quoted on the brick- that's the most current that the laptop can draw from it, so it's a safe bet that you won't need anything higher from the transformer.
 
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