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With computers, if you're not using them, put them in Standby (also called Sleep), that way they use almost as little power as being off while still being able to be used within a couple of seconds. For things that are accessed over the network, try to keep them all on one computer.
A laptop left on with the monitor off uses about 15-25 watts, monitor on about 20-30W. In sleep it's 2-5W.
A desktop with monitor off uses about 75-100W, monitor on 100-150W. In sleep it's usually 5-20W (desktop power supplies use heaps doing nothing, it's the same when they are off).
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