   Chapter 17, Problem 22P

Chapter
Section
Textbook Problem

The human body can exhibit a wide range of resistances to current depending on the path of the current, contact area, and sweatiness of the skin. Suppose the resistance across the chest from the left hand to the right hand is 1.0 × 106 Ω. (a) How much voltage is required to cause possible heart fibrillation in a man, which corresponds to 500 mA of direct current? (b) Why should rubber-soled shoes and rubber gloves be worn when working around electricity?

(a)

To determine
The voltage required for heart fibrillation in man

Explanation

Given Info: The resistance across chest is 1.0×106Ω , Heart fibrillation in man takes place at 500mA .

Explanation:

Formula to calculate the voltage is,

ΔV=IR

• ΔV is the required voltage,
• I is the electric current,
• R is the resistance across chest,

Substitute 500mA for I and 1

(b)

To determine
The reason for wearing rubber-soled shoes and rubber gloves when working around electricity.

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