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Regarding the computer issue.......
Almost all of the power that goes in is dissipated as heat!.
A little bit goes to the cooling fans. These move the air round, which heats it up. Also, the noise you hear from a computer ends up making things is the room vibrate (how your ears work). This heats the things up!.
Even if the noise didn't make heat, it is probably less than 1 watt of noise on a 300w or so computer!. I would say 99+% ends up as useable heat, which heats your room! It is the same with light bulbs - say 84% of their output is heat, 16% is light - but the majority of the light bounces around the room, ending up as heat.
Heat is the lowest 'grade' of energy, which is why it is quite strange to use electrical energy to make heat (except in NZ, where apparently 70% of electricity is from hydroelectric, and they have 'heat pumps' so you get 3000W of heat out, from maybe 1000W or less of electricity in!
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Team GasMisers5 - #1 for first three rounds of the original GS Fuel Economy Challenge
Miles displaced by e-bike since 1 Jan 2008: 62.6 ( 0 kWh used)
Hypomiler 
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Gearshredder 
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