The damage caused by electric shock depends on the current flowing through the b

Question

The damage caused by electric shock depends on the current flowing through the body; 1 mA can be Tell and o tuA is painful. Above 15 mA. a person loses muscle control, and 70 mA can be fatal. A person with dry skin has a resistance from one arm to the other of about 1.4 times 10 Ohm. When skin is wet. the resistance drops to about 5600 Ohm. What is the minimum voltage placed across the arms that would produce a current that could be felt by a person with dry skin? Answer in units of V. Using the same electric potential as in Part 1, what would be the current if the person had wet skin? Answer in units of mA. What would be the minimum voltage that would produce a current that could be felt when the skin is wet? Answer in units of V.

Explanation / Answer

To find the voltage, you would use 1mA since that is thevoltage that can be felt with dry skin. V = IR V = .001A * 1.4*105 V = 140V For part two, you would use that potential, change theresistance and find the current. I = V/R I = 140V/5600 I = 0.025A For the third part, you will do the same thing that you didfor the first part except use the resistance of wet skin V = 0.001A * 5600 V = 5.6V Hope that helps

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