Conceptual Physics (12th Edition)

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

Chapter 23 - Reading Check Questions (Comprehension): 33

Answer

They prevent too much current from flowing in a household circuit, which may cause a fire.

Work Step by Step

Fuses and circuit breakers "blow" or "trip", respectively, when too much current flows through them. They are wired in series with the circuits they protect. This is discussed on page 445.
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