How to read the numbers in ac wattmeter?

Discussion in 'Homework Help' started by qtlj657, Mar 21, 2012.

  1. qtlj657

    Thread Starter New Member

    Mar 18, 2012
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    0
    [​IMG]

    is what the analog show the Power? Say the analog in the pic point at 30, what's the power?
    what are the scale factor, switch position, F.S. watts
     
  2. crutschow

    Expert

    Mar 14, 2008
    12,974
    3,220
    It's hard to see but I believe you have both switches in the 150V-8A position. If so, then the scale factor is 4 (meaning the power is 4 times the reading on the meter, and the full scale is 4 x 150 or 600W). Thus a reading of 30 would mean a power of 120W.

    It would seem that to operate, both meter knobs are set for the maximum voltage and maximum current of the circuit. Then you look at the table to see the scale factor for the setting. The 150V full-scale factors are on the left and the 300V full-scale factors are on the right.
     
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  3. qtlj657

    Thread Starter New Member

    Mar 18, 2012
    7
    0
    thanks dude.
     
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