Res Analog Power Meter, Units per rev of "wheel" 2

[JerryNJ]

I have a residential analog electric power meter, the one with a horizontal wheel that rotates several times per KWH. This drives a series of 5 clock-type meters representing the numbers 0-9.

My question is how much power does one revolution of the horizontal wheel indicate.

I did a quick measurement this morning, recording with a stop watch, an average time of 6 seconds per revolution. I would estimate that the house was running at about a 4 KW load level. This suggests, given that the wheel would rotate 600 times in an hour, that one revolution of the wheel represents 4/600 = 0.0067 KWH. A strange number, I expected the value to be some order of 10, i.e., 0.1 or 0.01, so on. Seems that's not the case.

Anyone know the value of one revolution?

 

[waross]

Look on the meter face for the "Kh" This is the number of WATTHOURS per revolution, NOT KILOWATT HOURS. It is usually between 1 and 20. a Kh of 7.2 is common on residential meters but not universal.

Bill
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"Why not the best?"
Jimmy Carter

 

[JerryNJ]

Bill,

Thanks, I'll take a look at the meter next time I'm out, but can say from the measurement this moring 7.2 WH per rev works well, that gives 600 x 7.2 = 4,320 I know the load was a bit greater than 3.3 KW, the Heat Pump was running and using that much, another 1 KW between refrigerator, lights, whatever is clearly in the ball park.

Thanks,
Jerry