However! Putting my computer into hibernate mode dropped the energy usage by 1 watt – less than 1% compared to when it was idle in a sleep state. If we take the average price of 13 cents per kWh in the US, that’s around 14 dollars per year if the PC was in sleep mode for the whole year. This can be compared like you fully charged your phone two times. In the test, I used my computer in sleep mode and measured the power consumption that was 0.045 A at 251 VAC (that is around 12 Watts). But to find out how sleep mode actually helps us to save energy, I did a test. If you for example have a USB mouse, the lights on the mouse will be turned off when the computer is in sleep mode, and when you press a button on a mouse it will wake up the PC.
The USB devices can go either into sleep mode or continue to run.
In sleep mode, our computer will keep the RAM memory together with all of our USB devices powered. If you are one of those who are looking for a new computer, here is our Recommendation. When you press the power button on your PC, it triggers the software to resume with all the process which had previously been initiated and to “awake”. In sleep mode, the power of the computer is suspended to all devices, except for the RAM memory. Unlike computers, laptops during sleep mode consume around 2 watts of power. During normal mode, the desktop computer uses 60 to 300 watts of power which is around 30 times more than in sleep mode. To run a computer in sleep mode for a day (24h), it will cost you 0.06 cents by the current price of 13 cents per kWh. So How Much Power Does a Computer Use in Sleep Mode? Most computers typically consume between 3 to 10 watts in sleep mode. How Much Power Does a Computer Use in Sleep Mode?
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