Conceptual Physics (12th Edition)

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

Chapter 23 - Think and Explain - Page 449-450: 57

Answer

To keep charges flowing in a conducting medium, something (such as a battery or a generator) must maintain a difference in electric potential across the material.

Work Step by Step

This is discussed on page 431.
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