# What is a disadvantage of starting with autotransformer coils rather than with resistors?

### Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

Chapter
Section

### Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 27, Problem 6SQ
Textbook Problem
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## What is a disadvantage of starting with autotransformer coils rather than with resistors?

To determine

Explain the disadvantage of starting with an autotransformer coils rather than resistors.

### Explanation of Solution

An autotransformer is single winding device. A single winding can be act as a primary winding and the secondary winding. Generally winding of an autotransformer is an inductive coil. An inductive coil can act itself as an inductive load which leads to the lagging power factor on the secondary and reduces the efficiency. The other disadvantage is no isolation for the primary and secondary part of winding in the autotransformer...

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