Engineering Board Exam Reviewer · Series-Parallel Circuits · medium

The Wheatstone bridge shown is balanced. V=24 V, R1=30, , R2=90, , R3=20, , R4=60, , and R5=500, . Find the total resistance seen by the source.

  1. 37.5,
  2. 200,
  3. 34.88,
  4. 75,

Answer

A. 37.5,

Solution

Since the bridge is balanced, no current flows in R5, so it can be ignored. The two arms R1+R3=50, and R2+R4=150, are in parallel: RT=(50, )(150, )/50, +150, =37.5, .

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