Conceptual Physics (12th Edition)

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

Chapter 25 - Think and Explain: 73

Answer

See below.

Work Step by Step

The transformer requires ac voltage because it is the changing magnetic field in the primary winding that induces voltage in the secondary. If there is no change, there is no induction. AC voltage oscillates (at 60 Hz in the United States).
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