The logical thing would be to think that if you turn off the computer, you will save more energy than if you leave it on so as not to be using it, right? And indeed, it is. If you turn off the computer while you are eating, you will save some energy, help the planet and not lose money like crazy. But beware, these modest energy savings will have as a counterpart that will shorten the life of your computer, with the advanced generation of waste that entails.
We have already said yes, that you save more off, but since that also shortens the life of the computer, you have to really find out how much it will work, how much the savings will be. That way, we can evaluate if it's worth it or not take the trouble to turn it off.
To clarify how much energy a normal computer consumes during its different states and processes of use, we asked the physicist of Harvard University, Wolfang Rueckner, to do some tests with his iMac G5 computer of 2005. It was quite surprising to discover that when turning it on or turn it off, the machine consumed about 130 watts (a measure of the amount of energy used at each moment). But it consumed 92 watts while it was on without doing anything and only an efficient 4 watts when the hibernation mode was selected. And finally, switched off it used 2.8 watts because it remained plugged into electricity anyway, a very common practice that also happens in our homes with small appliances, a process that continues to consume even little. Something that generates a very low but very constant expense, by the way.
Adding to these accounts the consumption of the maximum peak which happens when we turn it off and turn it on, in the end it turns out that the electricity consumed by the computer if it shuts down for an hour is slightly less than if we let it hibernate.