Hi guys, I'm looking for a cheapish way to check the true power usage of a few computers in the house as well as other appliances. Am I right in saying I can wrap the power cord around one of those Clamp Multimeters to get a read out of the current Amps being drawn and then use that simply to calculate usage? If that is the case would this be okay? Is accuracy a concern? If that won't work what are my alternatives? Cheers.