The relatively high resistivity of dry skin, about 1 \times 10^6

Walter Clyburn 2021-12-17 Answered
The relatively high resistivity of dry skin, about 1×106 Ω • m, can safely limit the flow of current into deeper tissues of the body. Suppose an electrical worker places his palm on an instrument whose metal case is accidentally connected to a high voltage. The skin of the palm is about 1.5 mm thick. Estimate the area of skin on the worker’s palm that would contact a flat panel, then calculate the approximate resistance of the skin of the palm.
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Expert Answer

William Appel
Answered 2021-12-18 Author has 44 answers
Consider the worker’s palm as a circle of radius 7cm. The area of the skin on the worker’s palm now becomes
A=πr2
=π(0.07m)2
=0.0154m2
The resistance of the skin of the palm can be given by
R=ρsk×tA
Substituting the values and solving gives
R=1×106×1.5×103m0.0154m2
=97441.8
97

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