Conceptual Physics (12th Edition)

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

Chapter 23 - Think and Explain: 89

Answer

The sign is a nerdy physics joke.

Work Step by Step

High voltage and high current are dangerous. However, the ratio of voltage to current, resistance, is a property of all materials. For nonconductors, the electrical resistance is very high, but there if is no energy source, there's nothing to be concerned about.
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