Conceptual Physics (12th Edition)

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

Chapter 23 - Think and Explain: 98

Answer

See below.

Work Step by Step

For two or more devices connected in series, the supply voltage equals the SUM of the voltage drops across the devices. Each identical bulb "feels" only part of the voltage of the battery, and less current flows than normal. For such a low current, the filament is not sufficiently hot to glow (emit light).
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