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How can I check how much power my laptop is pulling at any given time?

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Might want to check Lesswatts – Dananjaya Apr 27 '11 at 18:38
up vote 3 down vote accepted

Install and run powertop:

sudo apt-get install powertop
sudo powertop
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Don't install this if you're looking for power measurements. They appear to be event frequency and duty cycle measurements. I don't see why this was accepted as an answer. – H2ONaCl Aug 23 '12 at 18:27
@broiyan, because it also shows how much power you are using and how long the battery will last. – psusi Aug 27 '12 at 18:35

powertop offers wattage starting from 2.0 version.

the acpi command also offers power consumption.

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