5th Edition

ISBN: 9780321976444

Author: James S. Walker

Publisher: PEARSON

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Textbook Question

Chapter 21, Problem 103PP

BIO Footwear Safety

The American National Standards Institute (ANSI) specifies safety standards for a number of potential workplace hazards. For example, ANSI requires that footwear provide protection against the effects of compression from a static weight, impact from a dropped object, puncture from a sharp tool, and cuts from saws. In addition, to protect against the potentially lethal effects of an electrical shock, ANSI provides standards for the electrical resistance that a person and footwear must offer to the flow of electric current.

Specifically, regulation ANSI Z41-1999 states that the resistance of a person and his or her footwear must be tested with the circuit shown in Figure 21-63. In this circuit, the voltage supplied by the battery is ɛ = 50.0 V and the resistance in the circuit is R = 1.00 MΩ. Initially the circuit is open and no current flows. When a person touches the metal sphere attached to the battery, however, the circuit is closed and a small current flows through the person, the shoes, and back to the battery. The amount of current flowing through the person can be determined by using a voltmeter to measure the voltage drop V across the resistor R. To be safe, the current should not exceed 150 µF.

Chapter 21, Problem 103PP, BIO Footwear Safety The American National Standards Institute (ANSI) specifies safety standards for , example 1

Notice that the experimental setup in Figure 21-63 is a dc circuit with two resistors in series—the resistance R and the resistance of the person and footwear, R_pf. It follows that the current in the circuit is I = ɛ/(R + R_pf). We also know that the current is I = V/R, where V is the reading of the voltmeter. These relationships can be combined to relate the voltage V to the resistance R_pf with the result shown in Figure 21-64. According to ANSI regulations, Type II footwear must give a resistance R_pf in the range of 0.1 × 10⁷ Ω to 100 × 10⁷ Ω.

Figure 21-64 Problems 103, 104, 105, and 106

Chapter 21, Problem 103PP, BIO Footwear Safety The American National Standards Institute (ANSI) specifies safety standards for , example 2

103. • Suppose the voltmeter measures a potential difference of 3.70 V across the resistor. What is the current that flows through the person’s body?

A. 3.70 × 10^-6 A
B. 5.00 × 10^-5 A
C. 0.0740 A
D. 3.70 A

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Chapter 21, Problem 102GP

Chapter 21, Problem 104PP

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