Electrical Engineering: Principles & Applications (6th Edition)

Published by Prentice Hall
ISBN 10: 0133116646
ISBN 13: 978-0-13311-664-9

Chapter 1 - 1.2 - Problems - Circuits, Currents, and Voltages - Page 35: P1.13

Answer

Closed Open Closed valve

Work Step by Step

Switch should be closed for current to flow through it. In fluids current is analogous to fluid flow so for it to flow the valve should be open. Open switch means current doesn't flow, and in fluids closed valve doesn't allow fluids to flow.
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