Which uses more energy?
Answer:
Hi,
Turn your computer off to save energy.
During the day, set your computer to hibernate after a few minutes of inactivity. This will save power, and allow you to start up again very quickly. See instructions below.
At night, turn your computer and all printers, scanners, routers, etc. off. We have our computers and all of the peripherals (printers, scanner, router, ...) plugged into power strips. At night we hibernate the computers, and turn off the power strip.
The power consumption all night is zero.
For our two computers and the attached peripherals, this saves us 1780 KWH per year, worth $178 at 10 cents a KWH. This also reduces green house gas emissions by 3560 lbs per year of CO2.
These savings were calculated by carefully measuring the power levels with a KillAWatt meter. All of the calculations are shown here:
http://www.builditsolar.com/references/h...
It seems amazing that just doing this little bit of extra work could save so much money and green house gas, but its true.
How To Use Hibernate:
You use Hibernate so that when you resume working the computer will start up quickly rather than having to go through the lengthy boot process.
How to set your computer to hibernate automatically:
Right click anywhere on the desktop.
Click on Properties.
Click on Screen Saver
Click on Power
Set "System Hibernates" to 15 minutes or so.
Under the "Hibernate" tab, make sure that Hibernate is enabled.
Under the "Advanced" tab, I also set the "When I press the power button" to "Hibernate" -- this way I can force the computer to Hibernate quickly by pressing the on/off button on the computer.
People have invented all sorts of reasons to keep your computer on all the time -- I think its all nonsense. If you care about saving money and reducing greenhouse gas emissions significantly, turn your computers off!
Gary
it has a sleep mode, which is a great energy saver.
Leaving it on... if you'll be away from it for a short amount of time, leaving it on won't use any more energy that rebooting would. If you're going to be away from it for an extended period of time, turn it off. Or at least put it in sleep mode. That uses minimal energy and it takes less time to "wake it up" than rebooting does.
Statistics say leaving it on uses more energy. Think about it.It's on, even if it has a sleep mode, it's still on. Still using energy. It's better to even unplug it when it's not in use, because the socket is still "hot", it still releases energy. Surf the net...You'll get your answer from a site who knows the exact energy percentage it uses.
leaving it on
It depends on the hardware, software and partly on the usage pattern. Hardware includes both PC, the specific power supply system, peripherals and monitor. Software includes power management software and screen savers... Usage pattern: if it's a shared computer, lots of turning it off and on might be significant.
The first link gives you a good idea why the answer is complex and why a statement like "A typical desktop computer uses about 65 to 250 watts. Some computers use more." is accurate and as precise a generalization as can be made. If you bought a standard manufacturer model, they might be able to tell you some useful information - but your usage behavior still has a lot of effect! If you built or had your machine built, or added a board or a peripheral... ::grin::
The wonderful site I offer as a first link suggests several things - including turn it off at the end of the day.
leaving it on unless you have it on hibernation or on an energy saving mode
puting in on hybernation keeps it from constantly using up energy, and doesn't use as much energy as it does to turn it back on again, just like with a car, it takes more gas to turn it on instead of just keeping it on for a little while.
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