Engineering Board Exam Reviewer · Circuit Theorems and Conversions · medium

The Y (wye) network shown has RA=10, , RB=30, , and RC=15, . Find the equivalent delta resistor RAB connected between terminals A and B.

  1. 60,
  2. 40,
  3. 20,
  4. 90,

Answer

A. 60,

Solution

For a wye-to-delta conversion, each delta resistor is the sum of the pairwise products divided by the opposite Y resistor: RAB=RARB+RBRC+RCRA/RC=900, 2/15, =60, .

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