The relatively high resistivity of dry skin, about 1×106m, can safely limit the

Question

The relatively high resistivity of dry skin, about 1×106m, 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 accidently connected to a high voltage. The skin of the palm is about 1.5 mm thick.

Part A

Assume the area of skin on the worker's palm that would contact a flat panel is 1.0×102 m2 , then calculate the approximate resistance of the skin of the palm.

Express your answer to two significant figures and include the appropriate units.

The relatively high resistivity of dry skin, about 1×106m, 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 accidently connected to a high voltage. The skin of the palm is about 1.5 mm thick.

Part A

Assume the area of skin on the worker's palm that would contact a flat panel is 1.0×102 m2 , then calculate the approximate resistance of the skin of the palm.

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

given

rho = 1*10^6 ohm.m

L = 1.5 mm = 1.5*10^-3 m

A = 1*10^-2 m^2

use the formula,

R = rho*L/A

= 1*10^6*1.5*10^-3/(1*10^-2)

= 1.5*10^5 ohms

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