Step 2: Type of Computer
In order of electricity use from top to bottom (top uses the most)
PC Desktop
Mac Desktop
Laptop
Desktops use between 60 and 250 watts of power, laptops use 15-45 watts
I'm not sure about linux systems, they're probably either the most or second most efficient.
I use a PC desktop, I like PC's cause I think they're faster and have more compatibility. Sorry Earth!
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Firstoff, a Mac Desktop is made of laptop components, so apart from a huge screen, has equal or near equal power consumption to a laptop.
Operating system does have an impact on power consumption in the loosest sense. That sense being that increased workload from any application (OS, Office, browsers, games) will result in more power drained. We know this is true because when playing a high-end game, the graphics card heats up, and the heat energy comes from electricity. Same idea on a phone (i.e. Iphone), games will make it heat up, and also drain the battery faster.
Therefore, because there are so many varieties of Linux, technically Linux will be the most power efficient because many Linux versions are built specifically to use low power. Also, Macs and Windows PCs are generally loaded with a greater amount of bloat ware which typical users do not remove, which causes increased power drain.
Finally, my computer uses a 1 kW power supply. Desktops may typically use between 60-250, but there are a significant number up to 500W and many high-end up to 1kW or more. Past comments are correct, comptuer power demand is almost entirely dependent
Windows is slow after the first 6 months. It takes longer to do the same functions, therefore more power draw. Also, CPU load is increased, which uses more power.