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Depending on the specific computer it can be anywhere from as little as a few milliwatts to hundreds of kilowatts. There is no single value, also many modern computers change the amount of power they consume depending on what they are doing at a given time (e.g. lots of calculations in the ALU increases power consumption, entering "sleep mode" due to user inactivity reduces power consumption)

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Q: How much electric power is consumed by a digital computer?
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