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: 91


Less damage is done by plugging a 220-V hairdryer into a 110-volt supply outlet.

Work Step by Step

Damage is done when too much current is driven through the appliance. In a hairdryer, the resistance of the heating element is tailored to the expected supply voltage. Plugging a 110-V hairdryer into a 220-volt supply outlet will cause twice as much current to flow as the hairdryer is expected to handle. On the other hand, plugging a 220-V hairdryer into a 110-volt supply outlet means that only half as much current flows as normal, and no damage will be done.
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