Conceptual Physics (12th Edition)

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

Chapter 23 - Think and Explain: 97

Answer

Nothing happens; the brightness of bulb A stays the same.

Work Step by Step

For two or more devices connected in parallel, the voltage is the same across each device. This is Rule 1 for parallel circuits, on page 444, and discussed on pages 443-444. This is also illustrated in Figure 23.18. Bulb A feels the full battery voltage both before and after the switch is closed.
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