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# watt-hour meter: finding revolutions per minute?

1.  Junior Member Pro Subscriber
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Jul 2016
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Reputation ## watt-hour meter: finding revolutions per minute?

This is the question from the test:

If a watt-hour meter has a disk constant of 3.6 is used with 600:5 ampere current transformers and 20:1 potential transformers, the primary Kh is?

The answers are in revolutions per minute. How do I get to revolutions per minute without knowing any of the output values?  Reply With Quote

2.  Junior Member
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Apr 2017
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Reputation ## Watthour Meter Originally Posted by Bradfoxthelegend This is the question from the test:

If a watt-hour meter has a disk constant of 3.6 is used with 600:5 ampere current transformers and 20:1 potential transformers, the primary Kh is?

The answers are in revolutions per minute. How do I get to revolutions per minute without knowing any of the output values?
=3.6*(600/5)*(20/1)
=8640  Reply With Quote

3.  Member
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Jun 2016
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Reputation  ## Thank you Originally Posted by Skyehaven40 =3.6*(600/5)*(20/1)
=8640
I have been looking for a way to answer that question for quite a bit. So simple and straight forward, Thank you  Reply With Quote

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