Answered: Three resistance of 7Ω, 14Ω and 21Ω are…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Three resistance of 7Ω, 14Ω and 21Ω are connected in star connection. Find equivalent resistance in delta connection.

Expert Solution

Step 1

Star Connection:

A star connection is achieved by connecting similar ends (“start” or “end”) of three coils together. The other end is connected to the lead wire. The common point is called the neutral point or star point and is denoted by N.

$\begin{array}{rcl} V_{L} & = & \sqrt{3} V_{ph} \\ I_{L} & = & I_{ph} \end{array}$

Delta Connection:

In the delta connection scheme, the beginnings of the three phases or coils are connected to the ends of the coils. Or the beginning of the first coil is connected to the end of his second coil, and so on for all three coils, looking like a closed net or circuit.

$\begin{array}{rcl} V_{L} & = & V_{ph} \\ I_{L} & = & \sqrt{3} I_{ph} \end{array}$

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