   Chapter 17, Problem 13P

Chapter
Section
Textbook Problem

A person notices a mild shock if the current along a path through the thumb and index finger exceeds 80. μA. Compare the maximum possible voltage without shock across the thumb and index finger with a dry-skin resistance of 4.0 × 103 Ω and a wet-skin resistance of 2.0 kΩ.

To determine

The maximum voltage without shock

Explanation

Given Info: The maximum current above which produce electric shock is produced, is 80μA. The dry skin resistance is 4.0×105Ω and 2.0 is the resistance of wet skin.

Formula to calculate the maximum voltage is ,

ΔVmax=ImaxR

• ΔVmax is the maximum voltage,
• Imax is the maximum electric current,
• R is the resistance of the heater,

Substitute 80μA for I and 4.0×105Ω for R in the above equation to find ΔV.

ΔVmax=(80μA)(10-6A1μA)(4

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