Posted by JMOR on March 23, 2012 at 07:19:57 from (72.190.9.193):
In Reply to: Simple amp meter posted by Poor farmer 830 on March 22, 2012 at 19:02:09:
Quoting Removed, click Modern View to see. I suggest that you take a more direct approach and measure the Watts passing through your electric meter. Not only will you be able to see parasitic current draw (everything in house turned off & unplugged), but you will be able to measure the power consumption of any one electrically powered device in you home whether it be a light bulb (point of reference for your meter), hot water heater (both measure & see it cycling on/off), air conditioner/heat pump, or anything electric that you have in your home. You can compare your 'reading' with the stated name plate draw (Watts) of the device/appliance.
If your meter looks like the picture, you will see a spinning disk of aluminum partially protruding through the face plate below the dials. Circled in red is a number called the "K sub h" factor & units are watt-hours per revolution. Here it is 7.2. Your meter might be 3.6 or some other number. Use the number on your meter. This disk will turn one revolution in one hour if the power being used is 7.2 watts.
To obtain your power useage at any time, you use your watch with sweep second hand and count the number of disk revolutions in one minute & write that number down as 'revolutions per minute'. Multiply that number by 7.2 (or 3.6 or whatever is on your meter). Next multiply that result by 60. The final result is equal to the power in Watts being used by everything in your home at the moment of your measurement.
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