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I'm not a circuit expert and am looking to build a small plug-in monitor for a dorm room. Can someone simply clarify what happens without the 6-12V AC input? I've used the EMON circuit here: https://openenergymonitor.org/emon/buildingblocks/...and it just uses the clamp alone. How far off are our measurements without monitoring the frequenzy? I believe we are assuming US 120V and 60Hz in the EMON code to get RMS and real power in the EMON code. I'm just having a hard time finding 6-12V AC power supplies for a bunch of small dorm submeters we want to build.