Conceptual Physics (12th Edition)

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

Chapter 23 - Think and Explain: 88

Answer

See below.

Work Step by Step

Voltage drives a current, which shocks you. So the "source" of the shock is the high applied voltage. The current doesn't flow unless a person is there and offers a conducting path from the high-voltage object to the earth, so the sign just warns you about the voltage.
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