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Q: I refer to the picture used as the background for the desktop. Can you tell me where it is stored? And what happens to a picture when it is replaced?
A: The default pictures that Windows uses are stored in the C:\Windows\Web folder. However, you can browse your entire hard disk to search for any suitable picture that you like to have, and it does not have to be copied to the Windows folder.
When you select your picture, Windows makes a copy and the original can be modified and even deleted and the desktop image will still remain.
Should we switch off the computer?
Q: We have an ongoing debate with our teenage son. He claims it is more energy efficient to leave his pc on, rather than turn on and off as needed. His parents think otherwise, but have no facts to make a case. Can you please help us settle the debate?
A: Generally I use and recommend the use of power saving, especially for the CRT monitor, mainly to save electricity. If the computer will not be used for many hours and especially overnight, I believe that it is best to turn it off.
Power consumption of a computer varies with the design, memory, number of hard disks and additional cards, but about 200 watts is a typical figure under no load. An average CRT monitor also uses about 100 watts and LCD monitors consume about 30 watts. Under a high load the total power consumption can be over 600 w. Assuming a total no-load consumption of 250 w and energy at 15 cents / kwh this equates to 90 cents per day or $27 per month if left on permanently and not used.
My suggestion is that in order to save money and lower the CO2 emissions the computer is switched off for lengthy periods when not being used, or as an alternative put into a standby mode where the energy consumption will drop to a few watts.
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