PPI Power Sample Exam 1: Morning Session - Ques. # 15

[bripgilb]

Gentlemen,

This is my first time posting on forums and first time on EngineeringBoards.

I'm studying for the Power PE Exam now. Take it in Oct.

Ran across this problem in Camara PPI Practice Exam Book.   The question is about a d'Arsonval meter.  I did not know how to do the problem.  I figured the answer was 9750 ohm.  

When looking at the solution it states that "an additional 1.5% error can occur in the external resistance".  Where does this comment come from?

Best regards,

bripgilb

 

[bripgilb]

Ok... So I think I understand.

(%accuracy of Rext) = ((%accuracy total) - (%accuracy of Rcoil))

1.5% = (2.5%-1%)

Thanks for anyone who looks at this!

 

[Stephen2awesome]

Ok... So I think I understand.

(%accuracy of Rext) = ((%accuracy total) - (%accuracy of Rcoil))

1.5% = (2.5%-1%)

Thanks for anyone who looks at this!

I had the same issue as well on this practice exam. I figured the same as you.