which parts are activated during the power off of computer
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Answer:
If you wonder when you should turn off your personal computer for energy savings, here are some general guidelines to help you make that decision.
Though there is a small surge in energy when a computer starts up, this small amount of energy is still less than the energy used when a computer is running for long periods of time. Spending a large portion of time in low-power mode not only saves energy but helps equipment run cooler and last longer.
One misconception, carried over from the days of older mainframe computers, is that equipment lasts longer if it is never turned off.For energy savings and convenience, consider the following guidelines:
Turn off the monitor if you aren't going to use your PC for more than 20 minutes.
Turn off both the CPU and monitor if you're not going to use your PC for more than 2 hours.
Make sure your monitors, printers, and other accessories are on a power strip/surge protector. When this equipment is not in use for extended periods, turn off the switch on the power strip to prevent them from drawing power even when shut off. If you don't use a power strip, unplug extra equipment when it's not in use.
Most PCs reach the end of their "useful" life due to advances in technology long before the effects of being switched on and off multiple times have a negative impact on their service life. The less time a PC is on, the longer it will "last." PCs also produce heat, so turning them off reduces building cooling loads.
ENERGY STAR-labeled computers use 30%-65% less energy than computers without this designation, depending on usage. Consider buying a laptop for your next computer upgrade; laptops use much less energy than desktop computers.
Power management is a feature of some electrical appliances, especially copiers, computers, computer CPUs, computer GPUs and computer peripherals such as monitors and printers, that turns off the power or switches the system to a low-power state when inactive. In computing this is known as PC power management and is built around a standard called ACPI, this supersedes APM. All recent computers have ACPI support.