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If I connect a computer to a external display, i.e. a projector, is it true that the computer had to do more "work" (calculation or whatever)?

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If you have video going on both sides, then yes. –  surfasb Jul 17 '11 at 16:04
    
vaso does that mean that if i connect my laptop to a bigger monitor, i should turn the laptop's monitor off to make the laptop do less work? –  Pacerier Jul 18 '11 at 3:09
    
You should not worry, the difference is negligible unless you are talking about an older laptop... –  Tom Wijsman Feb 7 '12 at 14:05

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up vote 2 down vote accepted

Only if the external display is larger, or if both displays are active at once. Simply going from a digital signal to an analog signal (e.g. DB-15 VGA) does not stress the CPU since there is dedicated circuitry in the video card for this conversion.

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so does that mean that if i connect my laptop to a bigger monitor, i should turn the laptop's monitor off to make the laptop do less work? –  Pacerier Jul 18 '11 at 3:09
    
No. You need to disable the laptop's display completely. –  Ignacio Vazquez-Abrams Jul 18 '11 at 4:09

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