Conceptual Physics (12th Edition)

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

Chapter 25 - Think and Explain - Page 482-483: 76


Voltage = 120 V, current = 0.1 A.

Work Step by Step

The first step-down transformer takes the voltage to 12 V and the second one steps it right back up to 120 V. Power = (current)(voltage), and the power in the primary equals the power in the secondary. Looking at the second transformer, the voltage went up by a factor of 10, so the current went down by a factor of 10, from 1 A to 0.1 A.
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