Machine-translated by Google. Questions are authored in English.
Top

Discussion

The chief reason a Wheatstone bridge cannot simply be used with an alternating supply to measure an impedance is that

  • A.the products of the opposite arms are no longer equal when the supply alternates
  • B.it provides only one adjustment where two are needed
  • C.the alternating current would heat the arms and change the values being compared
  • D.a galvanometer cannot be used as a detector on an alternating supply at all

Answer: B

The balance rule itself carries over unchanged; what does not carry over is the sufficiency of a single control. An impedance has magnitude and angle, and a bridge with one variable resistance can satisfy only the magnitude part of the condition.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.