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What is the difference between shutting down your computer and putting it into sleep mode?

Generally speaking, yes, it is better to put the computer to sleep than it is to shut it down, for two reasons: 1. It's better for you - resuming from sleep mode is a lot faster than going through the entire boot up process. 2. It's better for the computer - resuming operation from a low-powered state is less harsh on you computer components than when you jolt it alive by turning the power on from a shut down state.


Does the OS remain in RAM even if the computer is turn off?

no, nothing remains in ram after your computer is turned off (unless it's static ram but hardly anyone has that anymore) in sleep mode your OS does remain in ram but your computer isn't off in hibernate mode, your computer is off and your OS state is written to the hard drive, so that it can be loaded back into RAM more quickly


What command saves your work turns off the computer fans and hard disk and then places the computer in a lower-power state?

SLEEP


How does the computer keeps track of time even after it is turned off?

memory is not accessed when the computer is turned off. If the computer is in sleep mode, it retains power until resumed. If computer is in hibernate mode, contents of memory are written to disk first before power off, and reloaded on power on.


What is the function of the sleep key on the computer?

The sleep key shuts down some of the computer's systems in order to conserve energy, but it does not shut the computer completely off and thus you do not have to go through a full boot up of all systems when you want to wake the computer up.