Answered: Ra Re Rb Figure P2.20

Engineering

Electrical Engineering

Ra Re Rb Figure P2.20

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter17: Commercial And Industrial Air-conditioning Control Systems

Section: Chapter Questions

Problem 22RQ

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Concept explainers

Star Delta Conversion

Find the input resistance between points A and B of the following resistive network:

Question

The resistance for the network shown in Figure P2.20 between terminals a and b with c
open circuited is Rab=50 Ω. Similarly, the resistance between terminals b and c with a open is Rbc=100 Ω,and between c and a with b open is Rca=70 Ω. Now, suppose that a short circuit is
connected from terminal b to terminal c, and determine the resistance between terminal a and
the shorted terminals b–c.

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