Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 25 - Reading Check Questions (Comprehension) - Page 480-481: 21


The principle behind the transformer is that the input current and input voltage change with time. These produce a changing magnetic field, which induces a voltage and current in the secondary. Since the inputs change with time, alternating current is required.

Work Step by Step

This is discussed on page 476.
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