Conceptual Physics (12th Edition)

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

Chapter 25 - Think and Explain: 51

Answer

When the generator armature is connected to a circuit and current is flowing through it, work must be done to move this current-carrying conductor in the magnetic field.

Work Step by Step

Another way of looking at this is by remembering energy conservation. If the armature remained just as easy to turn even while the generator supplied current, the generator would be making more energy than it consumed, which is a no-no.
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